[PATCH v2 0/3] Create sub-device per LED

[PATCH v2 0/3] Create sub-device per LED

[Sakari Ailus]

Hi folks,

The original design decision in the V4L2 flash API allows controlling a two
LEDs (an indicator and a flash) through a single sub-device. This covered
virtually all flash driver chips back then but this no longer holds as
there are many LED driver chips with multiple flash LED outputs. This
necessitates creating as many sub-devices as there are flash LEDs.

Additionally the flash LEDs can be associated to different sensors. This is
not unconceivable although not very probable.

This patchset splits the indicator and flash LEDs exposed by the V4L2 flash
class framework into multiple sub-devices. This way the driver creates the
sub-devices individually for each LED which will also facilitate fwnode
matching (e.g. will you refer to LED or a LED driver chip with a phandle?).

since v1:

- Drop patch "staging: greybus: light: Don't leak memory for no gain" in
  favour of Rui's "staging: greybus: light: fix memory leak in v4l2
  register".

- Rebase "staging: greybus: light: fix memory leak in v4l2 register" on
  "media: v4l2-flash: Use led_classdev instead of led_classdev_flash for
  indicator" already in mediatree.

- Add "v4l2-flash-led-class: Document v4l2_flash_init() references" to the
  set.

Rui Miguel Silva (1):
  staging: greybus: light: fix memory leak in v4l2 register

Sakari Ailus (2):
  v4l2-flash-led-class: Create separate sub-devices for indicators
  v4l2-flash-led-class: Document v4l2_flash_init() references

 drivers/leds/leds-aat1290.c                    |   4 +-
 drivers/leds/leds-max77693.c                   |   4 +-
 drivers/media/v4l2-core/v4l2-flash-led-class.c | 113 +++++++++++++++----------
 drivers/staging/greybus/light.c                |  42 ++++-----
 include/media/v4l2-flash-led-class.h           |  47 +++++++---
 5 files changed, 127 insertions(+), 83 deletions(-)

-- 
2.11.0

[PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Sakari Ailus]

From: Rui Miguel Silva <rmfrfs@gmail.com>

We are allocating memory for the v4l2 flash configuration structure and
leak it in the normal path. Just use the stack for this as we do not
use it outside of this function.

Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/staging/greybus/light.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
index 129ceed39829..0771db418f84 100644
--- a/drivers/staging/greybus/light.c
+++ b/drivers/staging/greybus/light.c
@@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
 {
 	struct gb_connection *connection = get_conn_from_light(light);
 	struct device *dev = &connection->bundle->dev;
-	struct v4l2_flash_config *sd_cfg;
+	struct v4l2_flash_config sd_cfg = { {0} };
 	struct led_classdev_flash *fled;
 	struct led_classdev *iled = NULL;
 	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
-	int ret = 0;
-
-	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
-	if (!sd_cfg)
-		return -ENOMEM;
 
 	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
 	if (channel_torch)
 		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
-						&sd_cfg->torch_intensity);
+						&sd_cfg.torch_intensity);
 
 	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
 	if (channel_ind) {
 		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
-						&sd_cfg->indicator_intensity);
+						&sd_cfg.indicator_intensity);
 		iled = &channel_ind->fled.led_cdev;
 	}
 
@@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
 
 	fled = &channel_flash->fled;
 
-	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
+	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
 
 	/* Set the possible values to faults, in our case all faults */
-	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
+	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
 		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
 		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
 		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
 		LED_FAULT_LED_OVER_TEMPERATURE;
 
 	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
-					    &v4l2_flash_ops, sd_cfg);
-	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
-		ret = PTR_ERR(light->v4l2_flash);
-		goto out_free;
-	}
+					    &v4l2_flash_ops, &sd_cfg);
+	if (IS_ERR_OR_NULL(light->v4l2_flash))
+		return PTR_ERR(light->v4l2_flash);
 
-	return ret;
-
-out_free:
-	kfree(sd_cfg);
-	return ret;
+	return 0;
 }
 
 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
-- 
2.11.0

[PATCH v2 2/3] v4l2-flash-led-class: Create separate sub-devices for indicators

[Sakari Ailus]

The V4L2 flash interface allows controlling multiple LEDs through a single
sub-devices if, and only if, these LEDs are of different types. This
approach scales badly for flash controllers that drive multiple flash LEDs
or for LED specific associations. Essentially, the original assumption of a
LED driver chip that drives a single flash LED and an indicator LED is no
longer valid.

Address the matter by registering one sub-device per LED.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
 drivers/leds/leds-aat1290.c                    |   4 +-
 drivers/leds/leds-max77693.c                   |   4 +-
 drivers/media/v4l2-core/v4l2-flash-led-class.c | 113 +++++++++++++++----------
 drivers/staging/greybus/light.c                |  23 +++--
 include/media/v4l2-flash-led-class.h           |  41 ++++++---
 5 files changed, 117 insertions(+), 68 deletions(-)

diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c
index a21e19297745..424898e6c69d 100644
--- a/drivers/leds/leds-aat1290.c
+++ b/drivers/leds/leds-aat1290.c
@@ -432,7 +432,7 @@ static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
 	strlcpy(v4l2_sd_cfg->dev_name, led_cdev->name,
 		sizeof(v4l2_sd_cfg->dev_name));
 
-	s = &v4l2_sd_cfg->torch_intensity;
+	s = &v4l2_sd_cfg->intensity;
 	s->min = led->mm_current_scale[0];
 	s->max = led_cfg->max_mm_current;
 	s->step = 1;
@@ -504,7 +504,7 @@ static int aat1290_led_probe(struct platform_device *pdev)
 
 	/* Create V4L2 Flash subdev. */
 	led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
-					  fled_cdev, NULL, &v4l2_flash_ops,
+					  fled_cdev, &v4l2_flash_ops,
 					  &v4l2_sd_cfg);
 	if (IS_ERR(led->v4l2_flash)) {
 		ret = PTR_ERR(led->v4l2_flash);
diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c
index 2d3062d53325..adf0f191f794 100644
--- a/drivers/leds/leds-max77693.c
+++ b/drivers/leds/leds-max77693.c
@@ -856,7 +856,7 @@ static void max77693_init_v4l2_flash_config(struct max77693_sub_led *sub_led,
 		 "%s %d-%04x", sub_led->fled_cdev.led_cdev.name,
 		 i2c_adapter_id(i2c->adapter), i2c->addr);
 
-	s = &v4l2_sd_cfg->torch_intensity;
+	s = &v4l2_sd_cfg->intensity;
 	s->min = TORCH_IOUT_MIN;
 	s->max = sub_led->fled_cdev.led_cdev.max_brightness * TORCH_IOUT_STEP;
 	s->step = TORCH_IOUT_STEP;
@@ -931,7 +931,7 @@ static int max77693_register_led(struct max77693_sub_led *sub_led,
 
 	/* Register in the V4L2 subsystem. */
 	sub_led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
-					      fled_cdev, NULL, &v4l2_flash_ops,
+					      fled_cdev, &v4l2_flash_ops,
 					      &v4l2_sd_cfg);
 	if (IS_ERR(sub_led->v4l2_flash)) {
 		ret = PTR_ERR(sub_led->v4l2_flash);
diff --git a/drivers/media/v4l2-core/v4l2-flash-led-class.c b/drivers/media/v4l2-core/v4l2-flash-led-class.c
index aabc85dbb8b5..4ceef217de83 100644
--- a/drivers/media/v4l2-core/v4l2-flash-led-class.c
+++ b/drivers/media/v4l2-core/v4l2-flash-led-class.c
@@ -197,7 +197,7 @@ static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
 {
 	struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
-	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
 	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 	bool external_strobe;
 	int ret = 0;
@@ -299,10 +299,26 @@ static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
 			  struct v4l2_flash_ctrl_data *ctrl_init_data)
 {
 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
-	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
 	struct v4l2_ctrl_config *ctrl_cfg;
 	u32 mask;
 
+	/* Init INDICATOR_INTENSITY ctrl data */
+	if (v4l2_flash->iled_cdev) {
+		ctrl_init_data[INDICATOR_INTENSITY].cid =
+					V4L2_CID_FLASH_INDICATOR_INTENSITY;
+		ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
+		__lfs_to_v4l2_ctrl_config(&flash_cfg->intensity,
+					  ctrl_cfg);
+		ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
+		ctrl_cfg->min = 0;
+		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
+				  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
+	}
+
+	if (!led_cdev || WARN_ON(!(led_cdev->flags & LED_DEV_CAP_FLASH)))
+		return;
+
 	/* Init FLASH_FAULT ctrl data */
 	if (flash_cfg->flash_faults) {
 		ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT;
@@ -330,27 +346,11 @@ static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
 	/* Init TORCH_INTENSITY ctrl data */
 	ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY;
 	ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config;
-	__lfs_to_v4l2_ctrl_config(&flash_cfg->torch_intensity, ctrl_cfg);
+	__lfs_to_v4l2_ctrl_config(&flash_cfg->intensity, ctrl_cfg);
 	ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY;
 	ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
 			  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
 
-	/* Init INDICATOR_INTENSITY ctrl data */
-	if (v4l2_flash->iled_cdev) {
-		ctrl_init_data[INDICATOR_INTENSITY].cid =
-					V4L2_CID_FLASH_INDICATOR_INTENSITY;
-		ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
-		__lfs_to_v4l2_ctrl_config(&flash_cfg->indicator_intensity,
-					  ctrl_cfg);
-		ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
-		ctrl_cfg->min = 0;
-		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
-				  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
-	}
-
-	if (!(led_cdev->flags & LED_DEV_CAP_FLASH))
-		return;
-
 	/* Init FLASH_STROBE ctrl data */
 	ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE;
 	ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config;
@@ -485,7 +485,9 @@ static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
 	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 	int ret = 0;
 
-	v4l2_flash_set_led_brightness(v4l2_flash, ctrls[TORCH_INTENSITY]);
+	if (ctrls[TORCH_INTENSITY])
+		v4l2_flash_set_led_brightness(v4l2_flash,
+					      ctrls[TORCH_INTENSITY]);
 
 	if (ctrls[INDICATOR_INTENSITY])
 		v4l2_flash_set_led_brightness(v4l2_flash,
@@ -527,19 +529,21 @@ static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 {
 	struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
-	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
 	struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
 	int ret = 0;
 
 	if (!v4l2_fh_is_singular(&fh->vfh))
 		return 0;
 
-	mutex_lock(&led_cdev->led_access);
+	if (led_cdev) {
+		mutex_lock(&led_cdev->led_access);
 
-	led_sysfs_disable(led_cdev);
-	led_trigger_remove(led_cdev);
+		led_sysfs_disable(led_cdev);
+		led_trigger_remove(led_cdev);
 
-	mutex_unlock(&led_cdev->led_access);
+		mutex_unlock(&led_cdev->led_access);
+	}
 
 	if (led_cdev_ind) {
 		mutex_lock(&led_cdev_ind->led_access);
@@ -556,9 +560,11 @@ static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 
 	return 0;
 out_sync_device:
-	mutex_lock(&led_cdev->led_access);
-	led_sysfs_enable(led_cdev);
-	mutex_unlock(&led_cdev->led_access);
+	if (led_cdev) {
+		mutex_lock(&led_cdev->led_access);
+		led_sysfs_enable(led_cdev);
+		mutex_unlock(&led_cdev->led_access);
+	}
 
 	if (led_cdev_ind) {
 		mutex_lock(&led_cdev_ind->led_access);
@@ -573,21 +579,24 @@ static int v4l2_flash_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 {
 	struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
-	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
 	struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
 	int ret = 0;
 
 	if (!v4l2_fh_is_singular(&fh->vfh))
 		return 0;
 
-	mutex_lock(&led_cdev->led_access);
+	if (led_cdev) {
+		mutex_lock(&led_cdev->led_access);
 
-	if (v4l2_flash->ctrls[STROBE_SOURCE])
-		ret = v4l2_ctrl_s_ctrl(v4l2_flash->ctrls[STROBE_SOURCE],
+		if (v4l2_flash->ctrls[STROBE_SOURCE])
+			ret = v4l2_ctrl_s_ctrl(
+				v4l2_flash->ctrls[STROBE_SOURCE],
 				V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
-	led_sysfs_enable(led_cdev);
+		led_sysfs_enable(led_cdev);
 
-	mutex_unlock(&led_cdev->led_access);
+		mutex_unlock(&led_cdev->led_access);
+	}
 
 	if (led_cdev_ind) {
 		mutex_lock(&led_cdev_ind->led_access);
@@ -605,25 +614,19 @@ static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
 
 static const struct v4l2_subdev_ops v4l2_flash_subdev_ops;
 
-struct v4l2_flash *v4l2_flash_init(
+static struct v4l2_flash *__v4l2_flash_init(
 	struct device *dev, struct fwnode_handle *fwn,
-	struct led_classdev_flash *fled_cdev,
-	struct led_classdev *iled_cdev,
-	const struct v4l2_flash_ops *ops,
-	struct v4l2_flash_config *config)
+	struct led_classdev_flash *fled_cdev, struct led_classdev *iled_cdev,
+	const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config)
 {
 	struct v4l2_flash *v4l2_flash;
-	struct led_classdev *led_cdev;
 	struct v4l2_subdev *sd;
 	int ret;
 
-	if (!fled_cdev || !config)
+	if (!config)
 		return ERR_PTR(-EINVAL);
 
-	led_cdev = &fled_cdev->led_cdev;
-
-	v4l2_flash = devm_kzalloc(led_cdev->dev, sizeof(*v4l2_flash),
-					GFP_KERNEL);
+	v4l2_flash = devm_kzalloc(dev, sizeof(*v4l2_flash), GFP_KERNEL);
 	if (!v4l2_flash)
 		return ERR_PTR(-ENOMEM);
 
@@ -632,7 +635,7 @@ struct v4l2_flash *v4l2_flash_init(
 	v4l2_flash->iled_cdev = iled_cdev;
 	v4l2_flash->ops = ops;
 	sd->dev = dev;
-	sd->fwnode = fwn ? fwn : dev_fwnode(led_cdev->dev);
+	sd->fwnode = fwn ? fwn : dev_fwnode(dev);
 	v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
 	sd->internal_ops = &v4l2_flash_subdev_internal_ops;
 	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
@@ -664,8 +667,26 @@ struct v4l2_flash *v4l2_flash_init(
 
 	return ERR_PTR(ret);
 }
+
+struct v4l2_flash *v4l2_flash_init(
+	struct device *dev, struct fwnode_handle *fwn,
+	struct led_classdev_flash *fled_cdev,
+	const struct v4l2_flash_ops *ops,
+	struct v4l2_flash_config *config)
+{
+	return __v4l2_flash_init(dev, fwn, fled_cdev, NULL, ops, config);
+}
 EXPORT_SYMBOL_GPL(v4l2_flash_init);
 
+struct v4l2_flash *v4l2_flash_indicator_init(
+	struct device *dev, struct fwnode_handle *fwn,
+	struct led_classdev *iled_cdev,
+	struct v4l2_flash_config *config)
+{
+	return __v4l2_flash_init(dev, fwn, NULL, iled_cdev, NULL, config);
+}
+EXPORT_SYMBOL_GPL(v4l2_flash_indicator_init);
+
 void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
 {
 	struct v4l2_subdev *sd;
diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
index 0771db418f84..daeae91bb728 100644
--- a/drivers/staging/greybus/light.c
+++ b/drivers/staging/greybus/light.c
@@ -58,6 +58,7 @@ struct gb_light {
 	bool			ready;
 #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
 	struct v4l2_flash	*v4l2_flash;
+	struct v4l2_flash	*v4l2_flash_ind;
 #endif
 };
 
@@ -534,7 +535,7 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
 {
 	struct gb_connection *connection = get_conn_from_light(light);
 	struct device *dev = &connection->bundle->dev;
-	struct v4l2_flash_config sd_cfg = { {0} };
+	struct v4l2_flash_config sd_cfg = { {0} }, sd_cfg_ind = { {0} };
 	struct led_classdev_flash *fled;
 	struct led_classdev *iled = NULL;
 	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
@@ -542,12 +543,12 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
 	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
 	if (channel_torch)
 		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
-						&sd_cfg.torch_intensity);
+						&sd_cfg.intensity);
 
 	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
 	if (channel_ind) {
 		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
-						&sd_cfg.indicator_intensity);
+						&sd_cfg_ind.intensity);
 		iled = &channel_ind->fled.led_cdev;
 	}
 
@@ -557,6 +558,8 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
 	fled = &channel_flash->fled;
 
 	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
+	snprintf(sd_cfg_ind.dev_name, sizeof(sd_cfg_ind.dev_name),
+		 "%s indicator", light->name);
 
 	/* Set the possible values to faults, in our case all faults */
 	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
@@ -565,16 +568,26 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
 		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
 		LED_FAULT_LED_OVER_TEMPERATURE;
 
-	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
-					    &v4l2_flash_ops, &sd_cfg);
+	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, &v4l2_flash_ops,
+					    &sd_cfg);
 	if (IS_ERR_OR_NULL(light->v4l2_flash))
 		return PTR_ERR(light->v4l2_flash);
 
+	if (channel_ind) {
+		light->v4l2_flash_ind =
+			v4l2_flash_indicator_init(dev, NULL, iled, &sd_cfg_ind);
+		if (IS_ERR_OR_NULL(light->v4l2_flash_ind)) {
+			v4l2_flash_release(light->v4l2_flash);
+			return PTR_ERR(light->v4l2_flash_ind);
+		}
+	}
+
 	return 0;
 }
 
 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
 {
+	v4l2_flash_release(light->v4l2_flash_ind);
 	v4l2_flash_release(light->v4l2_flash);
 }
 #else
diff --git a/include/media/v4l2-flash-led-class.h b/include/media/v4l2-flash-led-class.h
index 54e31a805a88..c3f39992f3fa 100644
--- a/include/media/v4l2-flash-led-class.h
+++ b/include/media/v4l2-flash-led-class.h
@@ -56,8 +56,7 @@ struct v4l2_flash_ops {
  * struct v4l2_flash_config - V4L2 Flash sub-device initialization data
  * @dev_name:			the name of the media entity,
  *				unique in the system
- * @torch_intensity:		constraints for the LED in torch mode
- * @indicator_intensity:	constraints for the indicator LED
+ * @intensity:			non-flash strobe constraints for the LED
  * @flash_faults:		bitmask of flash faults that the LED flash class
  *				device can report; corresponding LED_FAULT* bit
  *				definitions are available in the header file
@@ -66,8 +65,7 @@ struct v4l2_flash_ops {
  */
 struct v4l2_flash_config {
 	char dev_name[32];
-	struct led_flash_setting torch_intensity;
-	struct led_flash_setting indicator_intensity;
+	struct led_flash_setting intensity;
 	u32 flash_faults;
 	unsigned int has_external_strobe:1;
 };
@@ -110,8 +108,6 @@ static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
  * @dev:	flash device, e.g. an I2C device
  * @fwn:	fwnode_handle of the LED, may be NULL if the same as device's
  * @fled_cdev:	LED flash class device to wrap
- * @iled_cdev:	LED flash class device representing indicator LED associated
- *		with fled_cdev, may be NULL
  * @ops:	V4L2 Flash device ops
  * @config:	initialization data for V4L2 Flash sub-device
  *
@@ -124,9 +120,24 @@ static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
 struct v4l2_flash *v4l2_flash_init(
 	struct device *dev, struct fwnode_handle *fwn,
 	struct led_classdev_flash *fled_cdev,
-	struct led_classdev *iled_cdev,
-	const struct v4l2_flash_ops *ops,
-	struct v4l2_flash_config *config);
+	const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config);
+
+/**
+ * v4l2_flash_indicator_init - initialize V4L2 indicator sub-device
+ * @dev:	flash device, e.g. an I2C device
+ * @fwn:	fwnode_handle of the LED, may be NULL if the same as device's
+ * @iled_cdev:	LED flash class device representing the indicator LED
+ * @config:	initialization data for V4L2 Flash sub-device
+ *
+ * Create V4L2 Flash sub-device wrapping given LED subsystem device.
+ *
+ * Returns: A valid pointer, or, when an error occurs, the return
+ * value is encoded using ERR_PTR(). Use IS_ERR() to check and
+ * PTR_ERR() to obtain the numeric return value.
+ */
+struct v4l2_flash *v4l2_flash_indicator_init(
+	struct device *dev, struct fwnode_handle *fwn,
+	struct led_classdev *iled_cdev, struct v4l2_flash_config *config);
 
 /**
  * v4l2_flash_release - release V4L2 Flash sub-device
@@ -139,10 +150,14 @@ void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
 #else
 static inline struct v4l2_flash *v4l2_flash_init(
 	struct device *dev, struct fwnode_handle *fwn,
-	struct led_classdev_flash *fled_cdev,
-	struct led_classdev *iled_cdev,
-	const struct v4l2_flash_ops *ops,
-	struct v4l2_flash_config *config)
+	struct led_classdev_flash *fled_cdev, struct v4l2_flash_config *config)
+{
+	return NULL;
+}
+
+static inline struct v4l2_flash *v4l2_flash_indicator_init(
+	struct device *dev, struct fwnode_handle *fwn,
+	struct led_classdev *iled_cdev, struct v4l2_flash_config *config)
 {
 	return NULL;
 }
-- 
2.11.0

[PATCH v2 3/3] v4l2-flash-led-class: Document v4l2_flash_init() references

[Sakari Ailus]

The v4l2_flash_init() keeps a reference to the ops struct but not to the
config struct (nor anything it contains). Document this.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
 include/media/v4l2-flash-led-class.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/media/v4l2-flash-led-class.h b/include/media/v4l2-flash-led-class.h
index c3f39992f3fa..6f4825b6a352 100644
--- a/include/media/v4l2-flash-led-class.h
+++ b/include/media/v4l2-flash-led-class.h
@@ -112,6 +112,9 @@ static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
  * @config:	initialization data for V4L2 Flash sub-device
  *
  * Create V4L2 Flash sub-device wrapping given LED subsystem device.
+ * The ops pointer is stored by the V4L2 flash framework. No
+ * references are held to config nor its contents once this function
+ * has returned.
  *
  * Returns: A valid pointer, or, when an error occurs, the return
  * value is encoded using ERR_PTR(). Use IS_ERR() to check and
@@ -130,6 +133,9 @@ struct v4l2_flash *v4l2_flash_init(
  * @config:	initialization data for V4L2 Flash sub-device
  *
  * Create V4L2 Flash sub-device wrapping given LED subsystem device.
+ * The ops pointer is stored by the V4L2 flash framework. No
+ * references are held to config nor its contents once this function
+ * has returned.
  *
  * Returns: A valid pointer, or, when an error occurs, the return
  * value is encoded using ERR_PTR(). Use IS_ERR() to check and
-- 
2.11.0

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Rui Miguel Silva]

Hi Sakari,
On Wed, Aug 09, 2017 at 02:15:53PM +0300, Sakari Ailus wrote:
> From: Rui Miguel Silva <rmfrfs@gmail.com>
> 
> We are allocating memory for the v4l2 flash configuration structure and
> leak it in the normal path. Just use the stack for this as we do not
> use it outside of this function.
> 
> Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
> Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---

This patch is *not* the patch that I have send, here are the code
differences from my patch to the one in this series:

<  	struct led_classdev_flash *iled = NULL;
---
>  	struct led_classdev *iled = NULL;
51c57
<  		iled = &channel_ind->fled;
---
>  		iled = &channel_ind->fled.led_cdev;
89c95

So, this do not apply at all.
Maybe you change something in your side.

---
Cheers,
	Rui


>  drivers/staging/greybus/light.c | 29 +++++++++--------------------
>  1 file changed, 9 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
> index 129ceed39829..0771db418f84 100644
> --- a/drivers/staging/greybus/light.c
> +++ b/drivers/staging/greybus/light.c
> @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  {
>  	struct gb_connection *connection = get_conn_from_light(light);
>  	struct device *dev = &connection->bundle->dev;
> -	struct v4l2_flash_config *sd_cfg;
> +	struct v4l2_flash_config sd_cfg = { {0} };
>  	struct led_classdev_flash *fled;
>  	struct led_classdev *iled = NULL;
>  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> -	int ret = 0;
> -
> -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
> -	if (!sd_cfg)
> -		return -ENOMEM;
>  
>  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
>  	if (channel_torch)
>  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> -						&sd_cfg->torch_intensity);
> +						&sd_cfg.torch_intensity);
>  
>  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
>  	if (channel_ind) {
>  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> -						&sd_cfg->indicator_intensity);
> +						&sd_cfg.indicator_intensity);
>  		iled = &channel_ind->fled.led_cdev;
>  	}
>  
> @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  
>  	fled = &channel_flash->fled;
>  
> -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
> +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
>  
>  	/* Set the possible values to faults, in our case all faults */
> -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
>  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
>  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
>  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
>  		LED_FAULT_LED_OVER_TEMPERATURE;
>  
>  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> -					    &v4l2_flash_ops, sd_cfg);
> -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
> -		ret = PTR_ERR(light->v4l2_flash);
> -		goto out_free;
> -	}
> +					    &v4l2_flash_ops, &sd_cfg);
> +	if (IS_ERR_OR_NULL(light->v4l2_flash))
> +		return PTR_ERR(light->v4l2_flash);
>  
> -	return ret;
> -
> -out_free:
> -	kfree(sd_cfg);
> -	return ret;
> +	return 0;
>  }
>  
>  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
> -- 
> 2.11.0
> 

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Sakari Ailus]

Hi Rui,

On Wed, Aug 09, 2017 at 02:20:02PM +0100, Rui Miguel Silva wrote:
> Hi Sakari,
> On Wed, Aug 09, 2017 at 02:15:53PM +0300, Sakari Ailus wrote:
> > From: Rui Miguel Silva <rmfrfs@gmail.com>
> > 
> > We are allocating memory for the v4l2 flash configuration structure and
> > leak it in the normal path. Just use the stack for this as we do not
> > use it outside of this function.
> > 
> > Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
> > Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
> > Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
> > ---
> 
> This patch is *not* the patch that I have send, here are the code
> differences from my patch to the one in this series:
> 
> <  	struct led_classdev_flash *iled = NULL;
> ---
> >  	struct led_classdev *iled = NULL;
> 51c57
> <  		iled = &channel_ind->fled;
> ---
> >  		iled = &channel_ind->fled.led_cdev;
> 89c95
> 
> So, this do not apply at all.
> Maybe you change something in your side.

It's been rebased on linux-next and in particular, patch 85f7ff9702bc
("media: v4l2-flash: Use led_classdev instead of led_classdev_flash for
indicator").

-- 
Sakari Ailus
e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Rui Miguel Silva]

Hi Sakari,
On Wed, Aug 09, 2017 at 06:36:59PM +0300, Sakari Ailus wrote:
> Hi Rui,
> 
> On Wed, Aug 09, 2017 at 02:20:02PM +0100, Rui Miguel Silva wrote:
> > Hi Sakari,
> > On Wed, Aug 09, 2017 at 02:15:53PM +0300, Sakari Ailus wrote:
> > > From: Rui Miguel Silva <rmfrfs@gmail.com>
> > > 
> > > We are allocating memory for the v4l2 flash configuration structure and
> > > leak it in the normal path. Just use the stack for this as we do not
> > > use it outside of this function.
> > > 
> > > Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
> > > Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > > Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
> > > Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
> > > ---
> > 
> > This patch is *not* the patch that I have send, here are the code
> > differences from my patch to the one in this series:
> > 
> > <  	struct led_classdev_flash *iled = NULL;
> > ---
> > >  	struct led_classdev *iled = NULL;
> > 51c57
> > <  		iled = &channel_ind->fled;
> > ---
> > >  		iled = &channel_ind->fled.led_cdev;
> > 89c95
> > 
> > So, this do not apply at all.
> > Maybe you change something in your side.
> 
> It's been rebased on linux-next and in particular, patch 85f7ff9702bc
> ("media: v4l2-flash: Use led_classdev instead of led_classdev_flash for
> indicator").

Yeah, I miss that patch also that touch greybus, thanks for the
rebase.

---
Cheers,
	Rui

Re: [PATCH v2 2/3] v4l2-flash-led-class: Create separate sub-devices for indicators

[Rui Miguel Silva]

Hi,
On Wed, Aug 09, 2017 at 02:15:54PM +0300, Sakari Ailus wrote:
> The V4L2 flash interface allows controlling multiple LEDs through a single
> sub-devices if, and only if, these LEDs are of different types. This
> approach scales badly for flash controllers that drive multiple flash LEDs
> or for LED specific associations. Essentially, the original assumption of a
> LED driver chip that drives a single flash LED and an indicator LED is no
> longer valid.
> 
> Address the matter by registering one sub-device per LED.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> ---
>  drivers/leds/leds-aat1290.c                    |   4 +-
>  drivers/leds/leds-max77693.c                   |   4 +-
>  drivers/media/v4l2-core/v4l2-flash-led-class.c | 113 +++++++++++++++----------
>  drivers/staging/greybus/light.c                |  23 +++--

For greybus/light:
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>

---
Cheers,
	Rui

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Hans Verkuil]

On 09/08/17 13:15, Sakari Ailus wrote:
> From: Rui Miguel Silva <rmfrfs@gmail.com>
> 
> We are allocating memory for the v4l2 flash configuration structure and
> leak it in the normal path. Just use the stack for this as we do not
> use it outside of this function.

I'm not sure why this is part of this patch series. This is a greybus
bug fix, right? And independent from the other two patches.

> 
> Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
> Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  drivers/staging/greybus/light.c | 29 +++++++++--------------------
>  1 file changed, 9 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
> index 129ceed39829..0771db418f84 100644
> --- a/drivers/staging/greybus/light.c
> +++ b/drivers/staging/greybus/light.c
> @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  {
>  	struct gb_connection *connection = get_conn_from_light(light);
>  	struct device *dev = &connection->bundle->dev;
> -	struct v4l2_flash_config *sd_cfg;
> +	struct v4l2_flash_config sd_cfg = { {0} };

Just use '= {};'

>  	struct led_classdev_flash *fled;
>  	struct led_classdev *iled = NULL;
>  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> -	int ret = 0;
> -
> -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
> -	if (!sd_cfg)
> -		return -ENOMEM;
>  
>  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
>  	if (channel_torch)
>  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> -						&sd_cfg->torch_intensity);
> +						&sd_cfg.torch_intensity);
>  
>  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
>  	if (channel_ind) {
>  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> -						&sd_cfg->indicator_intensity);
> +						&sd_cfg.indicator_intensity);
>  		iled = &channel_ind->fled.led_cdev;
>  	}
>  
> @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  
>  	fled = &channel_flash->fled;
>  
> -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
> +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
>  
>  	/* Set the possible values to faults, in our case all faults */
> -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
>  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
>  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
>  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
>  		LED_FAULT_LED_OVER_TEMPERATURE;
>  
>  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> -					    &v4l2_flash_ops, sd_cfg);
> -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
> -		ret = PTR_ERR(light->v4l2_flash);
> -		goto out_free;
> -	}
> +					    &v4l2_flash_ops, &sd_cfg);
> +	if (IS_ERR_OR_NULL(light->v4l2_flash))

Just IS_ERR since v4l2_flash_init() never returns NULL.

> +		return PTR_ERR(light->v4l2_flash);
>  
> -	return ret;
> -
> -out_free:
> -	kfree(sd_cfg);
> -	return ret;
> +	return 0;
>  }
>  
>  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
> 

After those two changes:

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Regards,

	Hans

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Hans Verkuil]

On 09/08/17 13:15, Sakari Ailus wrote:
> From: Rui Miguel Silva <rmfrfs@gmail.com>
> 
> We are allocating memory for the v4l2 flash configuration structure and
> leak it in the normal path. Just use the stack for this as we do not
> use it outside of this function.

I'm not sure why this is part of this patch series. This is a greybus
bug fix, right? And independent from the other two patches.

> 
> Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
> Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  drivers/staging/greybus/light.c | 29 +++++++++--------------------
>  1 file changed, 9 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
> index 129ceed39829..0771db418f84 100644
> --- a/drivers/staging/greybus/light.c
> +++ b/drivers/staging/greybus/light.c
> @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  {
>  	struct gb_connection *connection = get_conn_from_light(light);
>  	struct device *dev = &connection->bundle->dev;
> -	struct v4l2_flash_config *sd_cfg;
> +	struct v4l2_flash_config sd_cfg = { {0} };

Just use '= {};'

>  	struct led_classdev_flash *fled;
>  	struct led_classdev *iled = NULL;
>  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> -	int ret = 0;
> -
> -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
> -	if (!sd_cfg)
> -		return -ENOMEM;
>  
>  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
>  	if (channel_torch)
>  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> -						&sd_cfg->torch_intensity);
> +						&sd_cfg.torch_intensity);
>  
>  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
>  	if (channel_ind) {
>  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> -						&sd_cfg->indicator_intensity);
> +						&sd_cfg.indicator_intensity);
>  		iled = &channel_ind->fled.led_cdev;
>  	}
>  
> @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  
>  	fled = &channel_flash->fled;
>  
> -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
> +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
>  
>  	/* Set the possible values to faults, in our case all faults */
> -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
>  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
>  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
>  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
>  		LED_FAULT_LED_OVER_TEMPERATURE;
>  
>  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> -					    &v4l2_flash_ops, sd_cfg);
> -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
> -		ret = PTR_ERR(light->v4l2_flash);
> -		goto out_free;
> -	}
> +					    &v4l2_flash_ops, &sd_cfg);
> +	if (IS_ERR_OR_NULL(light->v4l2_flash))

Just IS_ERR since v4l2_flash_init() never returns NULL.

> +		return PTR_ERR(light->v4l2_flash);
>  
> -	return ret;
> -
> -out_free:
> -	kfree(sd_cfg);
> -	return ret;
> +	return 0;
>  }
>  
>  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
> 

After those two changes:

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Regards,

	Hans

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Hans Verkuil]

On 10/08/17 15:02, Hans Verkuil wrote:
> On 09/08/17 13:15, Sakari Ailus wrote:
>> From: Rui Miguel Silva <rmfrfs@gmail.com>
>>
>> We are allocating memory for the v4l2 flash configuration structure and
>> leak it in the normal path. Just use the stack for this as we do not
>> use it outside of this function.
> 
> I'm not sure why this is part of this patch series. This is a greybus
> bug fix, right? And independent from the other two patches.

Ah, I see. The second patch sits on top of this change. Sorry, I was a bit
too quick there.

	Hans

> 
>>
>> Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
>> Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
>> Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
>> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
>> ---
>>  drivers/staging/greybus/light.c | 29 +++++++++--------------------
>>  1 file changed, 9 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
>> index 129ceed39829..0771db418f84 100644
>> --- a/drivers/staging/greybus/light.c
>> +++ b/drivers/staging/greybus/light.c
>> @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>>  {
>>  	struct gb_connection *connection = get_conn_from_light(light);
>>  	struct device *dev = &connection->bundle->dev;
>> -	struct v4l2_flash_config *sd_cfg;
>> +	struct v4l2_flash_config sd_cfg = { {0} };
> 
> Just use '= {};'
> 
>>  	struct led_classdev_flash *fled;
>>  	struct led_classdev *iled = NULL;
>>  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
>> -	int ret = 0;
>> -
>> -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
>> -	if (!sd_cfg)
>> -		return -ENOMEM;
>>  
>>  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
>>  	if (channel_torch)
>>  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
>> -						&sd_cfg->torch_intensity);
>> +						&sd_cfg.torch_intensity);
>>  
>>  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
>>  	if (channel_ind) {
>>  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
>> -						&sd_cfg->indicator_intensity);
>> +						&sd_cfg.indicator_intensity);
>>  		iled = &channel_ind->fled.led_cdev;
>>  	}
>>  
>> @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>>  
>>  	fled = &channel_flash->fled;
>>  
>> -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
>> +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
>>  
>>  	/* Set the possible values to faults, in our case all faults */
>> -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
>> +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
>>  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
>>  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
>>  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
>>  		LED_FAULT_LED_OVER_TEMPERATURE;
>>  
>>  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
>> -					    &v4l2_flash_ops, sd_cfg);
>> -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
>> -		ret = PTR_ERR(light->v4l2_flash);
>> -		goto out_free;
>> -	}
>> +					    &v4l2_flash_ops, &sd_cfg);
>> +	if (IS_ERR_OR_NULL(light->v4l2_flash))
> 
> Just IS_ERR since v4l2_flash_init() never returns NULL.
> 
>> +		return PTR_ERR(light->v4l2_flash);
>>  
>> -	return ret;
>> -
>> -out_free:
>> -	kfree(sd_cfg);
>> -	return ret;
>> +	return 0;
>>  }
>>  
>>  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
>>
> 
> After those two changes:
> 
> Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
> 
> Regards,
> 
> 	Hans
> 

Re: [PATCH v2 3/3] v4l2-flash-led-class: Document v4l2_flash_init() references

[Hans Verkuil]

On 09/08/17 13:15, Sakari Ailus wrote:
> The v4l2_flash_init() keeps a reference to the ops struct but not to the
> config struct (nor anything it contains). Document this.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Regards,

	Hans

> ---
>  include/media/v4l2-flash-led-class.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/media/v4l2-flash-led-class.h b/include/media/v4l2-flash-led-class.h
> index c3f39992f3fa..6f4825b6a352 100644
> --- a/include/media/v4l2-flash-led-class.h
> +++ b/include/media/v4l2-flash-led-class.h
> @@ -112,6 +112,9 @@ static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
>   * @config:	initialization data for V4L2 Flash sub-device
>   *
>   * Create V4L2 Flash sub-device wrapping given LED subsystem device.
> + * The ops pointer is stored by the V4L2 flash framework. No
> + * references are held to config nor its contents once this function
> + * has returned.
>   *
>   * Returns: A valid pointer, or, when an error occurs, the return
>   * value is encoded using ERR_PTR(). Use IS_ERR() to check and
> @@ -130,6 +133,9 @@ struct v4l2_flash *v4l2_flash_init(
>   * @config:	initialization data for V4L2 Flash sub-device
>   *
>   * Create V4L2 Flash sub-device wrapping given LED subsystem device.
> + * The ops pointer is stored by the V4L2 flash framework. No
> + * references are held to config nor its contents once this function
> + * has returned.
>   *
>   * Returns: A valid pointer, or, when an error occurs, the return
>   * value is encoded using ERR_PTR(). Use IS_ERR() to check and
> 

Re: [PATCH v2 2/3] v4l2-flash-led-class: Create separate sub-devices for indicators

[Hans Verkuil]

On 09/08/17 13:15, Sakari Ailus wrote:
> The V4L2 flash interface allows controlling multiple LEDs through a single
> sub-devices if, and only if, these LEDs are of different types. This
> approach scales badly for flash controllers that drive multiple flash LEDs
> or for LED specific associations. Essentially, the original assumption of a
> LED driver chip that drives a single flash LED and an indicator LED is no
> longer valid.
> 
> Address the matter by registering one sub-device per LED.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>

Looks good, but I have the same comment about using '= {};' to zero a struct and
the use of IS_ERR instead of IS_ERR_OR_NULL for the return value check of
v4l2_flash_init as in the 1/3 patch.

After updating that you can add my:

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Regards,

	Hans

> ---
>  drivers/leds/leds-aat1290.c                    |   4 +-
>  drivers/leds/leds-max77693.c                   |   4 +-
>  drivers/media/v4l2-core/v4l2-flash-led-class.c | 113 +++++++++++++++----------
>  drivers/staging/greybus/light.c                |  23 +++--
>  include/media/v4l2-flash-led-class.h           |  41 ++++++---
>  5 files changed, 117 insertions(+), 68 deletions(-)
> 
> diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c
> index a21e19297745..424898e6c69d 100644
> --- a/drivers/leds/leds-aat1290.c
> +++ b/drivers/leds/leds-aat1290.c
> @@ -432,7 +432,7 @@ static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
>  	strlcpy(v4l2_sd_cfg->dev_name, led_cdev->name,
>  		sizeof(v4l2_sd_cfg->dev_name));
>  
> -	s = &v4l2_sd_cfg->torch_intensity;
> +	s = &v4l2_sd_cfg->intensity;
>  	s->min = led->mm_current_scale[0];
>  	s->max = led_cfg->max_mm_current;
>  	s->step = 1;
> @@ -504,7 +504,7 @@ static int aat1290_led_probe(struct platform_device *pdev)
>  
>  	/* Create V4L2 Flash subdev. */
>  	led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
> -					  fled_cdev, NULL, &v4l2_flash_ops,
> +					  fled_cdev, &v4l2_flash_ops,
>  					  &v4l2_sd_cfg);
>  	if (IS_ERR(led->v4l2_flash)) {
>  		ret = PTR_ERR(led->v4l2_flash);
> diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c
> index 2d3062d53325..adf0f191f794 100644
> --- a/drivers/leds/leds-max77693.c
> +++ b/drivers/leds/leds-max77693.c
> @@ -856,7 +856,7 @@ static void max77693_init_v4l2_flash_config(struct max77693_sub_led *sub_led,
>  		 "%s %d-%04x", sub_led->fled_cdev.led_cdev.name,
>  		 i2c_adapter_id(i2c->adapter), i2c->addr);
>  
> -	s = &v4l2_sd_cfg->torch_intensity;
> +	s = &v4l2_sd_cfg->intensity;
>  	s->min = TORCH_IOUT_MIN;
>  	s->max = sub_led->fled_cdev.led_cdev.max_brightness * TORCH_IOUT_STEP;
>  	s->step = TORCH_IOUT_STEP;
> @@ -931,7 +931,7 @@ static int max77693_register_led(struct max77693_sub_led *sub_led,
>  
>  	/* Register in the V4L2 subsystem. */
>  	sub_led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
> -					      fled_cdev, NULL, &v4l2_flash_ops,
> +					      fled_cdev, &v4l2_flash_ops,
>  					      &v4l2_sd_cfg);
>  	if (IS_ERR(sub_led->v4l2_flash)) {
>  		ret = PTR_ERR(sub_led->v4l2_flash);
> diff --git a/drivers/media/v4l2-core/v4l2-flash-led-class.c b/drivers/media/v4l2-core/v4l2-flash-led-class.c
> index aabc85dbb8b5..4ceef217de83 100644
> --- a/drivers/media/v4l2-core/v4l2-flash-led-class.c
> +++ b/drivers/media/v4l2-core/v4l2-flash-led-class.c
> @@ -197,7 +197,7 @@ static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
>  {
>  	struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
>  	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
> -	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
> +	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
>  	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
>  	bool external_strobe;
>  	int ret = 0;
> @@ -299,10 +299,26 @@ static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
>  			  struct v4l2_flash_ctrl_data *ctrl_init_data)
>  {
>  	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
> -	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
> +	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
>  	struct v4l2_ctrl_config *ctrl_cfg;
>  	u32 mask;
>  
> +	/* Init INDICATOR_INTENSITY ctrl data */
> +	if (v4l2_flash->iled_cdev) {
> +		ctrl_init_data[INDICATOR_INTENSITY].cid =
> +					V4L2_CID_FLASH_INDICATOR_INTENSITY;
> +		ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
> +		__lfs_to_v4l2_ctrl_config(&flash_cfg->intensity,
> +					  ctrl_cfg);
> +		ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
> +		ctrl_cfg->min = 0;
> +		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
> +				  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
> +	}
> +
> +	if (!led_cdev || WARN_ON(!(led_cdev->flags & LED_DEV_CAP_FLASH)))
> +		return;
> +
>  	/* Init FLASH_FAULT ctrl data */
>  	if (flash_cfg->flash_faults) {
>  		ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT;
> @@ -330,27 +346,11 @@ static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
>  	/* Init TORCH_INTENSITY ctrl data */
>  	ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY;
>  	ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config;
> -	__lfs_to_v4l2_ctrl_config(&flash_cfg->torch_intensity, ctrl_cfg);
> +	__lfs_to_v4l2_ctrl_config(&flash_cfg->intensity, ctrl_cfg);
>  	ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY;
>  	ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
>  			  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
>  
> -	/* Init INDICATOR_INTENSITY ctrl data */
> -	if (v4l2_flash->iled_cdev) {
> -		ctrl_init_data[INDICATOR_INTENSITY].cid =
> -					V4L2_CID_FLASH_INDICATOR_INTENSITY;
> -		ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
> -		__lfs_to_v4l2_ctrl_config(&flash_cfg->indicator_intensity,
> -					  ctrl_cfg);
> -		ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
> -		ctrl_cfg->min = 0;
> -		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
> -				  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
> -	}
> -
> -	if (!(led_cdev->flags & LED_DEV_CAP_FLASH))
> -		return;
> -
>  	/* Init FLASH_STROBE ctrl data */
>  	ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE;
>  	ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config;
> @@ -485,7 +485,9 @@ static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
>  	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
>  	int ret = 0;
>  
> -	v4l2_flash_set_led_brightness(v4l2_flash, ctrls[TORCH_INTENSITY]);
> +	if (ctrls[TORCH_INTENSITY])
> +		v4l2_flash_set_led_brightness(v4l2_flash,
> +					      ctrls[TORCH_INTENSITY]);
>  
>  	if (ctrls[INDICATOR_INTENSITY])
>  		v4l2_flash_set_led_brightness(v4l2_flash,
> @@ -527,19 +529,21 @@ static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>  {
>  	struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
>  	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
> -	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
> +	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
>  	struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
>  	int ret = 0;
>  
>  	if (!v4l2_fh_is_singular(&fh->vfh))
>  		return 0;
>  
> -	mutex_lock(&led_cdev->led_access);
> +	if (led_cdev) {
> +		mutex_lock(&led_cdev->led_access);
>  
> -	led_sysfs_disable(led_cdev);
> -	led_trigger_remove(led_cdev);
> +		led_sysfs_disable(led_cdev);
> +		led_trigger_remove(led_cdev);
>  
> -	mutex_unlock(&led_cdev->led_access);
> +		mutex_unlock(&led_cdev->led_access);
> +	}
>  
>  	if (led_cdev_ind) {
>  		mutex_lock(&led_cdev_ind->led_access);
> @@ -556,9 +560,11 @@ static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>  
>  	return 0;
>  out_sync_device:
> -	mutex_lock(&led_cdev->led_access);
> -	led_sysfs_enable(led_cdev);
> -	mutex_unlock(&led_cdev->led_access);
> +	if (led_cdev) {
> +		mutex_lock(&led_cdev->led_access);
> +		led_sysfs_enable(led_cdev);
> +		mutex_unlock(&led_cdev->led_access);
> +	}
>  
>  	if (led_cdev_ind) {
>  		mutex_lock(&led_cdev_ind->led_access);
> @@ -573,21 +579,24 @@ static int v4l2_flash_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>  {
>  	struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
>  	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
> -	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
> +	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
>  	struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
>  	int ret = 0;
>  
>  	if (!v4l2_fh_is_singular(&fh->vfh))
>  		return 0;
>  
> -	mutex_lock(&led_cdev->led_access);
> +	if (led_cdev) {
> +		mutex_lock(&led_cdev->led_access);
>  
> -	if (v4l2_flash->ctrls[STROBE_SOURCE])
> -		ret = v4l2_ctrl_s_ctrl(v4l2_flash->ctrls[STROBE_SOURCE],
> +		if (v4l2_flash->ctrls[STROBE_SOURCE])
> +			ret = v4l2_ctrl_s_ctrl(
> +				v4l2_flash->ctrls[STROBE_SOURCE],
>  				V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
> -	led_sysfs_enable(led_cdev);
> +		led_sysfs_enable(led_cdev);
>  
> -	mutex_unlock(&led_cdev->led_access);
> +		mutex_unlock(&led_cdev->led_access);
> +	}
>  
>  	if (led_cdev_ind) {
>  		mutex_lock(&led_cdev_ind->led_access);
> @@ -605,25 +614,19 @@ static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
>  
>  static const struct v4l2_subdev_ops v4l2_flash_subdev_ops;
>  
> -struct v4l2_flash *v4l2_flash_init(
> +static struct v4l2_flash *__v4l2_flash_init(
>  	struct device *dev, struct fwnode_handle *fwn,
> -	struct led_classdev_flash *fled_cdev,
> -	struct led_classdev *iled_cdev,
> -	const struct v4l2_flash_ops *ops,
> -	struct v4l2_flash_config *config)
> +	struct led_classdev_flash *fled_cdev, struct led_classdev *iled_cdev,
> +	const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config)
>  {
>  	struct v4l2_flash *v4l2_flash;
> -	struct led_classdev *led_cdev;
>  	struct v4l2_subdev *sd;
>  	int ret;
>  
> -	if (!fled_cdev || !config)
> +	if (!config)
>  		return ERR_PTR(-EINVAL);
>  
> -	led_cdev = &fled_cdev->led_cdev;
> -
> -	v4l2_flash = devm_kzalloc(led_cdev->dev, sizeof(*v4l2_flash),
> -					GFP_KERNEL);
> +	v4l2_flash = devm_kzalloc(dev, sizeof(*v4l2_flash), GFP_KERNEL);
>  	if (!v4l2_flash)
>  		return ERR_PTR(-ENOMEM);
>  
> @@ -632,7 +635,7 @@ struct v4l2_flash *v4l2_flash_init(
>  	v4l2_flash->iled_cdev = iled_cdev;
>  	v4l2_flash->ops = ops;
>  	sd->dev = dev;
> -	sd->fwnode = fwn ? fwn : dev_fwnode(led_cdev->dev);
> +	sd->fwnode = fwn ? fwn : dev_fwnode(dev);
>  	v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
>  	sd->internal_ops = &v4l2_flash_subdev_internal_ops;
>  	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> @@ -664,8 +667,26 @@ struct v4l2_flash *v4l2_flash_init(
>  
>  	return ERR_PTR(ret);
>  }
> +
> +struct v4l2_flash *v4l2_flash_init(
> +	struct device *dev, struct fwnode_handle *fwn,
> +	struct led_classdev_flash *fled_cdev,
> +	const struct v4l2_flash_ops *ops,
> +	struct v4l2_flash_config *config)
> +{
> +	return __v4l2_flash_init(dev, fwn, fled_cdev, NULL, ops, config);
> +}
>  EXPORT_SYMBOL_GPL(v4l2_flash_init);
>  
> +struct v4l2_flash *v4l2_flash_indicator_init(
> +	struct device *dev, struct fwnode_handle *fwn,
> +	struct led_classdev *iled_cdev,
> +	struct v4l2_flash_config *config)
> +{
> +	return __v4l2_flash_init(dev, fwn, NULL, iled_cdev, NULL, config);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_flash_indicator_init);
> +
>  void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
>  {
>  	struct v4l2_subdev *sd;
> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
> index 0771db418f84..daeae91bb728 100644
> --- a/drivers/staging/greybus/light.c
> +++ b/drivers/staging/greybus/light.c
> @@ -58,6 +58,7 @@ struct gb_light {
>  	bool			ready;
>  #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
>  	struct v4l2_flash	*v4l2_flash;
> +	struct v4l2_flash	*v4l2_flash_ind;
>  #endif
>  };
>  
> @@ -534,7 +535,7 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  {
>  	struct gb_connection *connection = get_conn_from_light(light);
>  	struct device *dev = &connection->bundle->dev;
> -	struct v4l2_flash_config sd_cfg = { {0} };
> +	struct v4l2_flash_config sd_cfg = { {0} }, sd_cfg_ind = { {0} };
>  	struct led_classdev_flash *fled;
>  	struct led_classdev *iled = NULL;
>  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> @@ -542,12 +543,12 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
>  	if (channel_torch)
>  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> -						&sd_cfg.torch_intensity);
> +						&sd_cfg.intensity);
>  
>  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
>  	if (channel_ind) {
>  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> -						&sd_cfg.indicator_intensity);
> +						&sd_cfg_ind.intensity);
>  		iled = &channel_ind->fled.led_cdev;
>  	}
>  
> @@ -557,6 +558,8 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  	fled = &channel_flash->fled;
>  
>  	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
> +	snprintf(sd_cfg_ind.dev_name, sizeof(sd_cfg_ind.dev_name),
> +		 "%s indicator", light->name);
>  
>  	/* Set the possible values to faults, in our case all faults */
>  	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> @@ -565,16 +568,26 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
>  		LED_FAULT_LED_OVER_TEMPERATURE;
>  
> -	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> -					    &v4l2_flash_ops, &sd_cfg);
> +	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, &v4l2_flash_ops,
> +					    &sd_cfg);
>  	if (IS_ERR_OR_NULL(light->v4l2_flash))
>  		return PTR_ERR(light->v4l2_flash);
>  
> +	if (channel_ind) {
> +		light->v4l2_flash_ind =
> +			v4l2_flash_indicator_init(dev, NULL, iled, &sd_cfg_ind);
> +		if (IS_ERR_OR_NULL(light->v4l2_flash_ind)) {
> +			v4l2_flash_release(light->v4l2_flash);
> +			return PTR_ERR(light->v4l2_flash_ind);
> +		}
> +	}
> +
>  	return 0;
>  }
>  
>  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
>  {
> +	v4l2_flash_release(light->v4l2_flash_ind);
>  	v4l2_flash_release(light->v4l2_flash);
>  }
>  #else
> diff --git a/include/media/v4l2-flash-led-class.h b/include/media/v4l2-flash-led-class.h
> index 54e31a805a88..c3f39992f3fa 100644
> --- a/include/media/v4l2-flash-led-class.h
> +++ b/include/media/v4l2-flash-led-class.h
> @@ -56,8 +56,7 @@ struct v4l2_flash_ops {
>   * struct v4l2_flash_config - V4L2 Flash sub-device initialization data
>   * @dev_name:			the name of the media entity,
>   *				unique in the system
> - * @torch_intensity:		constraints for the LED in torch mode
> - * @indicator_intensity:	constraints for the indicator LED
> + * @intensity:			non-flash strobe constraints for the LED
>   * @flash_faults:		bitmask of flash faults that the LED flash class
>   *				device can report; corresponding LED_FAULT* bit
>   *				definitions are available in the header file
> @@ -66,8 +65,7 @@ struct v4l2_flash_ops {
>   */
>  struct v4l2_flash_config {
>  	char dev_name[32];
> -	struct led_flash_setting torch_intensity;
> -	struct led_flash_setting indicator_intensity;
> +	struct led_flash_setting intensity;
>  	u32 flash_faults;
>  	unsigned int has_external_strobe:1;
>  };
> @@ -110,8 +108,6 @@ static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
>   * @dev:	flash device, e.g. an I2C device
>   * @fwn:	fwnode_handle of the LED, may be NULL if the same as device's
>   * @fled_cdev:	LED flash class device to wrap
> - * @iled_cdev:	LED flash class device representing indicator LED associated
> - *		with fled_cdev, may be NULL
>   * @ops:	V4L2 Flash device ops
>   * @config:	initialization data for V4L2 Flash sub-device
>   *
> @@ -124,9 +120,24 @@ static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
>  struct v4l2_flash *v4l2_flash_init(
>  	struct device *dev, struct fwnode_handle *fwn,
>  	struct led_classdev_flash *fled_cdev,
> -	struct led_classdev *iled_cdev,
> -	const struct v4l2_flash_ops *ops,
> -	struct v4l2_flash_config *config);
> +	const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config);
> +
> +/**
> + * v4l2_flash_indicator_init - initialize V4L2 indicator sub-device
> + * @dev:	flash device, e.g. an I2C device
> + * @fwn:	fwnode_handle of the LED, may be NULL if the same as device's
> + * @iled_cdev:	LED flash class device representing the indicator LED
> + * @config:	initialization data for V4L2 Flash sub-device
> + *
> + * Create V4L2 Flash sub-device wrapping given LED subsystem device.
> + *
> + * Returns: A valid pointer, or, when an error occurs, the return
> + * value is encoded using ERR_PTR(). Use IS_ERR() to check and
> + * PTR_ERR() to obtain the numeric return value.
> + */
> +struct v4l2_flash *v4l2_flash_indicator_init(
> +	struct device *dev, struct fwnode_handle *fwn,
> +	struct led_classdev *iled_cdev, struct v4l2_flash_config *config);
>  
>  /**
>   * v4l2_flash_release - release V4L2 Flash sub-device
> @@ -139,10 +150,14 @@ void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
>  #else
>  static inline struct v4l2_flash *v4l2_flash_init(
>  	struct device *dev, struct fwnode_handle *fwn,
> -	struct led_classdev_flash *fled_cdev,
> -	struct led_classdev *iled_cdev,
> -	const struct v4l2_flash_ops *ops,
> -	struct v4l2_flash_config *config)
> +	struct led_classdev_flash *fled_cdev, struct v4l2_flash_config *config)
> +{
> +	return NULL;
> +}
> +
> +static inline struct v4l2_flash *v4l2_flash_indicator_init(
> +	struct device *dev, struct fwnode_handle *fwn,
> +	struct led_classdev *iled_cdev, struct v4l2_flash_config *config)
>  {
>  	return NULL;
>  }
> 

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Sakari Ailus]

Hi Hans,

On Thu, Aug 10, 2017 at 03:02:46PM +0200, Hans Verkuil wrote:
> > @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
> >  {
> >  	struct gb_connection *connection = get_conn_from_light(light);
> >  	struct device *dev = &connection->bundle->dev;
> > -	struct v4l2_flash_config *sd_cfg;
> > +	struct v4l2_flash_config sd_cfg = { {0} };
> 
> Just use '= {};'

This is GCC specific whereas { {0} } is standard C. The latter is thus
obviously better IMO.

> 
> >  	struct led_classdev_flash *fled;
> >  	struct led_classdev *iled = NULL;
> >  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> > -	int ret = 0;
> > -
> > -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
> > -	if (!sd_cfg)
> > -		return -ENOMEM;
> >  
> >  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
> >  	if (channel_torch)
> >  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> > -						&sd_cfg->torch_intensity);
> > +						&sd_cfg.torch_intensity);
> >  
> >  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
> >  	if (channel_ind) {
> >  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> > -						&sd_cfg->indicator_intensity);
> > +						&sd_cfg.indicator_intensity);
> >  		iled = &channel_ind->fled.led_cdev;
> >  	}
> >  
> > @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
> >  
> >  	fled = &channel_flash->fled;
> >  
> > -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
> > +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
> >  
> >  	/* Set the possible values to faults, in our case all faults */
> > -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> > +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> >  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
> >  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
> >  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
> >  		LED_FAULT_LED_OVER_TEMPERATURE;
> >  
> >  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> > -					    &v4l2_flash_ops, sd_cfg);
> > -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
> > -		ret = PTR_ERR(light->v4l2_flash);
> > -		goto out_free;
> > -	}
> > +					    &v4l2_flash_ops, &sd_cfg);
> > +	if (IS_ERR_OR_NULL(light->v4l2_flash))
> 
> Just IS_ERR since v4l2_flash_init() never returns NULL.

Will fix.

> 
> > +		return PTR_ERR(light->v4l2_flash);
> >  
> > -	return ret;
> > -
> > -out_free:
> > -	kfree(sd_cfg);
> > -	return ret;
> > +	return 0;
> >  }
> >  
> >  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
> > 
> 
> After those two changes:
> 
> Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk

Re: [PATCH v2 1/3] staging: greybus: light: fix memory leak in v4l2 register

[Rui Miguel Silva]

Hi,
On Thu, Aug 10, 2017 at 04:56:50PM +0300, Sakari Ailus wrote:
> Hi Hans,
> 
> On Thu, Aug 10, 2017 at 03:02:46PM +0200, Hans Verkuil wrote:
> > > @@ -534,25 +534,20 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
> > >  {
> > >  	struct gb_connection *connection = get_conn_from_light(light);
> > >  	struct device *dev = &connection->bundle->dev;
> > > -	struct v4l2_flash_config *sd_cfg;
> > > +	struct v4l2_flash_config sd_cfg = { {0} };
> > 
> > Just use '= {};'
> 
> This is GCC specific whereas { {0} } is standard C. The latter is thus
> obviously better IMO.

My thought exactly. Let keep it this way, please.

> 
> > 
> > >  	struct led_classdev_flash *fled;
> > >  	struct led_classdev *iled = NULL;
> > >  	struct gb_channel *channel_torch, *channel_ind, *channel_flash;
> > > -	int ret = 0;
> > > -
> > > -	sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
> > > -	if (!sd_cfg)
> > > -		return -ENOMEM;
> > >  
> > >  	channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
> > >  	if (channel_torch)
> > >  		__gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
> > > -						&sd_cfg->torch_intensity);
> > > +						&sd_cfg.torch_intensity);
> > >  
> > >  	channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
> > >  	if (channel_ind) {
> > >  		__gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
> > > -						&sd_cfg->indicator_intensity);
> > > +						&sd_cfg.indicator_intensity);
> > >  		iled = &channel_ind->fled.led_cdev;
> > >  	}
> > >  
> > > @@ -561,27 +556,21 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
> > >  
> > >  	fled = &channel_flash->fled;
> > >  
> > > -	snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
> > > +	snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
> > >  
> > >  	/* Set the possible values to faults, in our case all faults */
> > > -	sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> > > +	sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
> > >  		LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
> > >  		LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
> > >  		LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
> > >  		LED_FAULT_LED_OVER_TEMPERATURE;
> > >  
> > >  	light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
> > > -					    &v4l2_flash_ops, sd_cfg);
> > > -	if (IS_ERR_OR_NULL(light->v4l2_flash)) {
> > > -		ret = PTR_ERR(light->v4l2_flash);
> > > -		goto out_free;
> > > -	}
> > > +					    &v4l2_flash_ops, &sd_cfg);
> > > +	if (IS_ERR_OR_NULL(light->v4l2_flash))
> > 
> > Just IS_ERR since v4l2_flash_init() never returns NULL.
> 
> Will fix.

Thanks for that Sakari.

---
Cheers,
	Rui

> 
> > 
> > > +		return PTR_ERR(light->v4l2_flash);
> > >  
> > > -	return ret;
> > > -
> > > -out_free:
> > > -	kfree(sd_cfg);
> > > -	return ret;
> > > +	return 0;
> > >  }
> > >  
> > >  static void gb_lights_light_v4l2_unregister(struct gb_light *light)
> > > 
> > 
> > After those two changes:
> > 
> > Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
> 
> -- 
> Regards,
> 
> Sakari Ailus
> e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk