* [PATCH v3 0/3] devres: provide and use devm_krealloc()
@ 2020-07-10 16:15 ` Bartosz Golaszewski
0 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Hi Greg,
As discussed, resending the remaining devm_krealloc() patches.
===
Regular krealloc() obviously can't work with managed memory. This series
implements devm_krealloc() and adds the first users with hope that this
helper will be adopted by other drivers currently using non-managed
krealloc().
Some additional changes to the code modified by main patches are included.
v1 -> v2:
- remove leftover call to hwmon_device_unregister() from pmbus_core.c
- add a patch extending devm_kmalloc() to handle zero size case
- use WARN_ON() instead of WARN_ONCE() in devm_krealloc() when passed
a pointer to non-managed memory
- correctly handle the case when devm_krealloc() is passed a pointer to
memory in .rodata (potentially returned by devm_kstrdup_const())
- correctly handle ZERO_SIZE_PTR passed as the ptr argument in devm_krealloc()
v2 -> v3:
- drop already applied patches
- collect Acks
- add an additional user in iio
Bartosz Golaszewski (3):
devres: provide devm_krealloc()
hwmon: pmbus: use more devres helpers
iio: adc: xilinx-xadc: use devm_krealloc()
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/devres.c | 50 +++++++++++++++++++
drivers/hwmon/pmbus/pmbus_core.c | 28 ++++-------
drivers/iio/adc/xilinx-xadc-core.c | 16 +++---
include/linux/device.h | 2 +
5 files changed, 70 insertions(+), 27 deletions(-)
--
2.26.1
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH v3 0/3] devres: provide and use devm_krealloc()
@ 2020-07-10 16:15 ` Bartosz Golaszewski
0 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, Bartosz Golaszewski, linux-kernel, linux-arm-kernel
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Hi Greg,
As discussed, resending the remaining devm_krealloc() patches.
===
Regular krealloc() obviously can't work with managed memory. This series
implements devm_krealloc() and adds the first users with hope that this
helper will be adopted by other drivers currently using non-managed
krealloc().
Some additional changes to the code modified by main patches are included.
v1 -> v2:
- remove leftover call to hwmon_device_unregister() from pmbus_core.c
- add a patch extending devm_kmalloc() to handle zero size case
- use WARN_ON() instead of WARN_ONCE() in devm_krealloc() when passed
a pointer to non-managed memory
- correctly handle the case when devm_krealloc() is passed a pointer to
memory in .rodata (potentially returned by devm_kstrdup_const())
- correctly handle ZERO_SIZE_PTR passed as the ptr argument in devm_krealloc()
v2 -> v3:
- drop already applied patches
- collect Acks
- add an additional user in iio
Bartosz Golaszewski (3):
devres: provide devm_krealloc()
hwmon: pmbus: use more devres helpers
iio: adc: xilinx-xadc: use devm_krealloc()
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/devres.c | 50 +++++++++++++++++++
drivers/hwmon/pmbus/pmbus_core.c | 28 ++++-------
drivers/iio/adc/xilinx-xadc-core.c | 16 +++---
include/linux/device.h | 2 +
5 files changed, 70 insertions(+), 27 deletions(-)
--
2.26.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH v3 1/3] devres: provide devm_krealloc()
2020-07-10 16:15 ` Bartosz Golaszewski
@ 2020-07-10 16:15 ` Bartosz Golaszewski
-1 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Implement the managed variant of krealloc(). This function works with
all memory allocated by devm_kmalloc() (or devres functions using it
implicitly like devm_kmemdup(), devm_kstrdup() etc.).
Managed realloc'ed chunks can be manually released with devm_kfree().
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/devres.c | 50 +++++++++++++++++++
include/linux/device.h | 2 +
3 files changed, 53 insertions(+)
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index eaaaafc21134..aa08f5162524 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -353,6 +353,7 @@ MEM
devm_kfree()
devm_kmalloc()
devm_kmalloc_array()
+ devm_krealloc()
devm_kmemdup()
devm_kstrdup()
devm_kvasprintf()
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index ed615d3b9cf1..4b8870ef6a3f 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -837,6 +837,56 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
}
EXPORT_SYMBOL_GPL(devm_kmalloc);
+void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
+{
+ struct devres *old_dr, *new_dr;
+ struct list_head old_head;
+ unsigned long flags;
+ void *ret = NULL;
+ size_t tot_size;
+
+ if (unlikely(!new_size)) {
+ devm_kfree(dev, ptr);
+ return ZERO_SIZE_PTR;
+ }
+
+ if (unlikely(ZERO_OR_NULL_PTR(ptr)))
+ return devm_kmalloc(dev, new_size, gfp);
+
+ if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
+ /*
+ * We cannot reliably realloc a const string returned by
+ * devm_kstrdup_const().
+ */
+ return NULL;
+
+ if (!check_dr_size(new_size, &tot_size))
+ return NULL;
+
+ spin_lock_irqsave(&dev->devres_lock, flags);
+
+ old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
+ if (WARN_ON(!old_dr))
+ /* Memory chunk not managed or managed by a different device. */
+ goto out;
+
+ old_head = old_dr->node.entry;
+
+ new_dr = krealloc(old_dr, tot_size, gfp);
+ if (!new_dr)
+ goto out;
+
+ if (new_dr != old_dr)
+ list_replace(&old_head, &new_dr->node.entry);
+
+ ret = new_dr->data;
+
+out:
+ spin_unlock_irqrestore(&dev->devres_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_krealloc);
+
/**
* devm_kstrdup - Allocate resource managed space and
* copy an existing string into that.
diff --git a/include/linux/device.h b/include/linux/device.h
index 7322c51e9c0c..f64f40843159 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -206,6 +206,8 @@ int devres_release_group(struct device *dev, void *id);
/* managed devm_k.alloc/kfree for device drivers */
void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
+void *devm_krealloc(struct device *dev, void *ptr, size_t size,
+ gfp_t gfp) __must_check;
__printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
const char *fmt, va_list ap) __malloc;
__printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
--
2.26.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v3 1/3] devres: provide devm_krealloc()
@ 2020-07-10 16:15 ` Bartosz Golaszewski
0 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, Bartosz Golaszewski, linux-kernel, linux-arm-kernel
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Implement the managed variant of krealloc(). This function works with
all memory allocated by devm_kmalloc() (or devres functions using it
implicitly like devm_kmemdup(), devm_kstrdup() etc.).
Managed realloc'ed chunks can be manually released with devm_kfree().
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/devres.c | 50 +++++++++++++++++++
include/linux/device.h | 2 +
3 files changed, 53 insertions(+)
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index eaaaafc21134..aa08f5162524 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -353,6 +353,7 @@ MEM
devm_kfree()
devm_kmalloc()
devm_kmalloc_array()
+ devm_krealloc()
devm_kmemdup()
devm_kstrdup()
devm_kvasprintf()
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index ed615d3b9cf1..4b8870ef6a3f 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -837,6 +837,56 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
}
EXPORT_SYMBOL_GPL(devm_kmalloc);
+void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
+{
+ struct devres *old_dr, *new_dr;
+ struct list_head old_head;
+ unsigned long flags;
+ void *ret = NULL;
+ size_t tot_size;
+
+ if (unlikely(!new_size)) {
+ devm_kfree(dev, ptr);
+ return ZERO_SIZE_PTR;
+ }
+
+ if (unlikely(ZERO_OR_NULL_PTR(ptr)))
+ return devm_kmalloc(dev, new_size, gfp);
+
+ if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
+ /*
+ * We cannot reliably realloc a const string returned by
+ * devm_kstrdup_const().
+ */
+ return NULL;
+
+ if (!check_dr_size(new_size, &tot_size))
+ return NULL;
+
+ spin_lock_irqsave(&dev->devres_lock, flags);
+
+ old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
+ if (WARN_ON(!old_dr))
+ /* Memory chunk not managed or managed by a different device. */
+ goto out;
+
+ old_head = old_dr->node.entry;
+
+ new_dr = krealloc(old_dr, tot_size, gfp);
+ if (!new_dr)
+ goto out;
+
+ if (new_dr != old_dr)
+ list_replace(&old_head, &new_dr->node.entry);
+
+ ret = new_dr->data;
+
+out:
+ spin_unlock_irqrestore(&dev->devres_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_krealloc);
+
/**
* devm_kstrdup - Allocate resource managed space and
* copy an existing string into that.
diff --git a/include/linux/device.h b/include/linux/device.h
index 7322c51e9c0c..f64f40843159 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -206,6 +206,8 @@ int devres_release_group(struct device *dev, void *id);
/* managed devm_k.alloc/kfree for device drivers */
void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
+void *devm_krealloc(struct device *dev, void *ptr, size_t size,
+ gfp_t gfp) __must_check;
__printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
const char *fmt, va_list ap) __malloc;
__printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
--
2.26.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v3 2/3] hwmon: pmbus: use more devres helpers
2020-07-10 16:15 ` Bartosz Golaszewski
@ 2020-07-10 16:15 ` Bartosz Golaszewski
-1 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Shrink pmbus code by using devm_hwmon_device_register_with_groups()
and devm_krealloc() instead of their non-managed variants.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/pmbus/pmbus_core.c | 28 +++++++++-------------------
1 file changed, 9 insertions(+), 19 deletions(-)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 44535add3a4a..91839979cf6c 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -1018,9 +1018,9 @@ static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
{
if (data->num_attributes >= data->max_attributes - 1) {
int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
- void *new_attrs = krealloc(data->group.attrs,
- new_max_attrs * sizeof(void *),
- GFP_KERNEL);
+ void *new_attrs = devm_krealloc(data->dev, data->group.attrs,
+ new_max_attrs * sizeof(void *),
+ GFP_KERNEL);
if (!new_attrs)
return -ENOMEM;
data->group.attrs = new_attrs;
@@ -2534,7 +2534,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
ret = pmbus_find_attributes(client, data);
if (ret)
- goto out_kfree;
+ return ret;
/*
* If there are no attributes, something is wrong.
@@ -2542,35 +2542,27 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
*/
if (!data->num_attributes) {
dev_err(dev, "No attributes found\n");
- ret = -ENODEV;
- goto out_kfree;
+ return -ENODEV;
}
data->groups[0] = &data->group;
memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
- data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
- data, data->groups);
+ data->hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+ client->name, data, data->groups);
if (IS_ERR(data->hwmon_dev)) {
- ret = PTR_ERR(data->hwmon_dev);
dev_err(dev, "Failed to register hwmon device\n");
- goto out_kfree;
+ return PTR_ERR(data->hwmon_dev);
}
ret = pmbus_regulator_register(data);
if (ret)
- goto out_unregister;
+ return ret;
ret = pmbus_init_debugfs(client, data);
if (ret)
dev_warn(dev, "Failed to register debugfs\n");
return 0;
-
-out_unregister:
- hwmon_device_unregister(data->hwmon_dev);
-out_kfree:
- kfree(data->group.attrs);
- return ret;
}
EXPORT_SYMBOL_GPL(pmbus_do_probe);
@@ -2580,8 +2572,6 @@ int pmbus_do_remove(struct i2c_client *client)
debugfs_remove_recursive(data->debugfs);
- hwmon_device_unregister(data->hwmon_dev);
- kfree(data->group.attrs);
return 0;
}
EXPORT_SYMBOL_GPL(pmbus_do_remove);
--
2.26.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v3 2/3] hwmon: pmbus: use more devres helpers
@ 2020-07-10 16:15 ` Bartosz Golaszewski
0 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, Bartosz Golaszewski, linux-kernel, linux-arm-kernel
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Shrink pmbus code by using devm_hwmon_device_register_with_groups()
and devm_krealloc() instead of their non-managed variants.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/pmbus/pmbus_core.c | 28 +++++++++-------------------
1 file changed, 9 insertions(+), 19 deletions(-)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 44535add3a4a..91839979cf6c 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -1018,9 +1018,9 @@ static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
{
if (data->num_attributes >= data->max_attributes - 1) {
int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
- void *new_attrs = krealloc(data->group.attrs,
- new_max_attrs * sizeof(void *),
- GFP_KERNEL);
+ void *new_attrs = devm_krealloc(data->dev, data->group.attrs,
+ new_max_attrs * sizeof(void *),
+ GFP_KERNEL);
if (!new_attrs)
return -ENOMEM;
data->group.attrs = new_attrs;
@@ -2534,7 +2534,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
ret = pmbus_find_attributes(client, data);
if (ret)
- goto out_kfree;
+ return ret;
/*
* If there are no attributes, something is wrong.
@@ -2542,35 +2542,27 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
*/
if (!data->num_attributes) {
dev_err(dev, "No attributes found\n");
- ret = -ENODEV;
- goto out_kfree;
+ return -ENODEV;
}
data->groups[0] = &data->group;
memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
- data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
- data, data->groups);
+ data->hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+ client->name, data, data->groups);
if (IS_ERR(data->hwmon_dev)) {
- ret = PTR_ERR(data->hwmon_dev);
dev_err(dev, "Failed to register hwmon device\n");
- goto out_kfree;
+ return PTR_ERR(data->hwmon_dev);
}
ret = pmbus_regulator_register(data);
if (ret)
- goto out_unregister;
+ return ret;
ret = pmbus_init_debugfs(client, data);
if (ret)
dev_warn(dev, "Failed to register debugfs\n");
return 0;
-
-out_unregister:
- hwmon_device_unregister(data->hwmon_dev);
-out_kfree:
- kfree(data->group.attrs);
- return ret;
}
EXPORT_SYMBOL_GPL(pmbus_do_probe);
@@ -2580,8 +2572,6 @@ int pmbus_do_remove(struct i2c_client *client)
debugfs_remove_recursive(data->debugfs);
- hwmon_device_unregister(data->hwmon_dev);
- kfree(data->group.attrs);
return 0;
}
EXPORT_SYMBOL_GPL(pmbus_do_remove);
--
2.26.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v3 3/3] iio: adc: xilinx-xadc: use devm_krealloc()
2020-07-10 16:15 ` Bartosz Golaszewski
@ 2020-07-10 16:15 ` Bartosz Golaszewski
-1 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Use the managed variant of krealloc() and shrink the code a bit.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/iio/adc/xilinx-xadc-core.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index d7fecab9252e..5bdbe502e983 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1094,6 +1094,7 @@ MODULE_DEVICE_TABLE(of, xadc_of_match_table);
static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
unsigned int *conf)
{
+ struct device *dev = indio_dev->dev.parent;
struct xadc *xadc = iio_priv(indio_dev);
struct iio_chan_spec *channels, *chan;
struct device_node *chan_node, *child;
@@ -1138,7 +1139,8 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
*conf |= XADC_CONF0_MUX | XADC_CONF0_CHAN(ext_mux_chan);
}
- channels = kmemdup(xadc_channels, sizeof(xadc_channels), GFP_KERNEL);
+ channels = devm_kmemdup(dev, xadc_channels,
+ sizeof(xadc_channels), GFP_KERNEL);
if (!channels)
return -ENOMEM;
@@ -1174,8 +1176,9 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
of_node_put(chan_node);
indio_dev->num_channels = num_channels;
- indio_dev->channels = krealloc(channels, sizeof(*channels) *
- num_channels, GFP_KERNEL);
+ indio_dev->channels = devm_krealloc(dev, channels,
+ sizeof(*channels) * num_channels,
+ GFP_KERNEL);
/* If we can't resize the channels array, just use the original */
if (!indio_dev->channels)
indio_dev->channels = channels;
@@ -1229,14 +1232,14 @@ static int xadc_probe(struct platform_device *pdev)
ret = xadc_parse_dt(indio_dev, pdev->dev.of_node, &conf0);
if (ret)
- goto err_device_free;
+ return ret;
if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time, &xadc_trigger_handler,
&xadc_buffer_ops);
if (ret)
- goto err_device_free;
+ return ret;
xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst");
if (IS_ERR(xadc->convst_trigger)) {
@@ -1354,8 +1357,6 @@ static int xadc_probe(struct platform_device *pdev)
err_triggered_buffer_cleanup:
if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
iio_triggered_buffer_cleanup(indio_dev);
-err_device_free:
- kfree(indio_dev->channels);
return ret;
}
@@ -1375,7 +1376,6 @@ static int xadc_remove(struct platform_device *pdev)
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
clk_disable_unprepare(xadc->clk);
kfree(xadc->data);
- kfree(indio_dev->channels);
return 0;
}
--
2.26.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v3 3/3] iio: adc: xilinx-xadc: use devm_krealloc()
@ 2020-07-10 16:15 ` Bartosz Golaszewski
0 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-10 16:15 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck
Cc: linux-iio, Bartosz Golaszewski, linux-kernel, linux-arm-kernel
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Use the managed variant of krealloc() and shrink the code a bit.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/iio/adc/xilinx-xadc-core.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index d7fecab9252e..5bdbe502e983 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1094,6 +1094,7 @@ MODULE_DEVICE_TABLE(of, xadc_of_match_table);
static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
unsigned int *conf)
{
+ struct device *dev = indio_dev->dev.parent;
struct xadc *xadc = iio_priv(indio_dev);
struct iio_chan_spec *channels, *chan;
struct device_node *chan_node, *child;
@@ -1138,7 +1139,8 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
*conf |= XADC_CONF0_MUX | XADC_CONF0_CHAN(ext_mux_chan);
}
- channels = kmemdup(xadc_channels, sizeof(xadc_channels), GFP_KERNEL);
+ channels = devm_kmemdup(dev, xadc_channels,
+ sizeof(xadc_channels), GFP_KERNEL);
if (!channels)
return -ENOMEM;
@@ -1174,8 +1176,9 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
of_node_put(chan_node);
indio_dev->num_channels = num_channels;
- indio_dev->channels = krealloc(channels, sizeof(*channels) *
- num_channels, GFP_KERNEL);
+ indio_dev->channels = devm_krealloc(dev, channels,
+ sizeof(*channels) * num_channels,
+ GFP_KERNEL);
/* If we can't resize the channels array, just use the original */
if (!indio_dev->channels)
indio_dev->channels = channels;
@@ -1229,14 +1232,14 @@ static int xadc_probe(struct platform_device *pdev)
ret = xadc_parse_dt(indio_dev, pdev->dev.of_node, &conf0);
if (ret)
- goto err_device_free;
+ return ret;
if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time, &xadc_trigger_handler,
&xadc_buffer_ops);
if (ret)
- goto err_device_free;
+ return ret;
xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst");
if (IS_ERR(xadc->convst_trigger)) {
@@ -1354,8 +1357,6 @@ static int xadc_probe(struct platform_device *pdev)
err_triggered_buffer_cleanup:
if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
iio_triggered_buffer_cleanup(indio_dev);
-err_device_free:
- kfree(indio_dev->channels);
return ret;
}
@@ -1375,7 +1376,6 @@ static int xadc_remove(struct platform_device *pdev)
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
clk_disable_unprepare(xadc->clk);
kfree(xadc->data);
- kfree(indio_dev->channels);
return 0;
}
--
2.26.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH v3 1/3] devres: provide devm_krealloc()
2020-07-10 16:15 ` Bartosz Golaszewski
@ 2020-07-11 15:08 ` Andy Shevchenko
-1 siblings, 0 replies; 12+ messages in thread
From: Andy Shevchenko @ 2020-07-11 15:08 UTC (permalink / raw)
To: Bartosz Golaszewski
Cc: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, linux-iio, linux-arm Mailing List,
Linux Kernel Mailing List, Bartosz Golaszewski
On Fri, Jul 10, 2020 at 7:17 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Implement the managed variant of krealloc(). This function works with
> all memory allocated by devm_kmalloc() (or devres functions using it
> implicitly like devm_kmemdup(), devm_kstrdup() etc.).
>
> Managed realloc'ed chunks can be manually released with devm_kfree().
...
> devm_kfree()
> devm_kmalloc()
> devm_kmalloc_array()
> + devm_krealloc()
> devm_kmemdup()
> devm_kstrdup()
> devm_kvasprintf()
Order?
...
> +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
Do we really need the 'new_' prefix in the parameter?
> +{
> + struct devres *old_dr, *new_dr;
> + struct list_head old_head;
> + unsigned long flags;
> + void *ret = NULL;
> + size_t tot_size;
tot -> total.
> +
> + if (unlikely(!new_size)) {
> + devm_kfree(dev, ptr);
> + return ZERO_SIZE_PTR;
> + }
I guess here we need a comment of the possibilities below to have
ZERO_SIZE_PTR as input.
> + if (unlikely(ZERO_OR_NULL_PTR(ptr)))
> + return devm_kmalloc(dev, new_size, gfp);
> +
> + if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
> + /*
> + * We cannot reliably realloc a const string returned by
> + * devm_kstrdup_const().
> + */
> + return NULL;
> +
> + if (!check_dr_size(new_size, &tot_size))
> + return NULL;
> +
> + spin_lock_irqsave(&dev->devres_lock, flags);
> +
> + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
> + if (WARN_ON(!old_dr))
Under spin lock? I would rather see spin unlock followed by WARN.
> + /* Memory chunk not managed or managed by a different device. */
> + goto out;
> +
> + old_head = old_dr->node.entry;
> +
> + new_dr = krealloc(old_dr, tot_size, gfp);
> + if (!new_dr)
> + goto out;
> +
> + if (new_dr != old_dr)
> + list_replace(&old_head, &new_dr->node.entry);
> +
> + ret = new_dr->data;
> +
> +out:
> + spin_unlock_irqrestore(&dev->devres_lock, flags);
> + return ret;
> +}
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH v3 1/3] devres: provide devm_krealloc()
@ 2020-07-11 15:08 ` Andy Shevchenko
0 siblings, 0 replies; 12+ messages in thread
From: Andy Shevchenko @ 2020-07-11 15:08 UTC (permalink / raw)
To: Bartosz Golaszewski
Cc: linux-arm Mailing List, Lars-Peter Clausen, linux-iio,
Greg Kroah-Hartman, Michal Simek, Linux Kernel Mailing List,
Bartosz Golaszewski, Guenter Roeck, Peter Meerwald-Stadler,
Hartmut Knaack, Jonathan Cameron
On Fri, Jul 10, 2020 at 7:17 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Implement the managed variant of krealloc(). This function works with
> all memory allocated by devm_kmalloc() (or devres functions using it
> implicitly like devm_kmemdup(), devm_kstrdup() etc.).
>
> Managed realloc'ed chunks can be manually released with devm_kfree().
...
> devm_kfree()
> devm_kmalloc()
> devm_kmalloc_array()
> + devm_krealloc()
> devm_kmemdup()
> devm_kstrdup()
> devm_kvasprintf()
Order?
...
> +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
Do we really need the 'new_' prefix in the parameter?
> +{
> + struct devres *old_dr, *new_dr;
> + struct list_head old_head;
> + unsigned long flags;
> + void *ret = NULL;
> + size_t tot_size;
tot -> total.
> +
> + if (unlikely(!new_size)) {
> + devm_kfree(dev, ptr);
> + return ZERO_SIZE_PTR;
> + }
I guess here we need a comment of the possibilities below to have
ZERO_SIZE_PTR as input.
> + if (unlikely(ZERO_OR_NULL_PTR(ptr)))
> + return devm_kmalloc(dev, new_size, gfp);
> +
> + if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
> + /*
> + * We cannot reliably realloc a const string returned by
> + * devm_kstrdup_const().
> + */
> + return NULL;
> +
> + if (!check_dr_size(new_size, &tot_size))
> + return NULL;
> +
> + spin_lock_irqsave(&dev->devres_lock, flags);
> +
> + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
> + if (WARN_ON(!old_dr))
Under spin lock? I would rather see spin unlock followed by WARN.
> + /* Memory chunk not managed or managed by a different device. */
> + goto out;
> +
> + old_head = old_dr->node.entry;
> +
> + new_dr = krealloc(old_dr, tot_size, gfp);
> + if (!new_dr)
> + goto out;
> +
> + if (new_dr != old_dr)
> + list_replace(&old_head, &new_dr->node.entry);
> +
> + ret = new_dr->data;
> +
> +out:
> + spin_unlock_irqrestore(&dev->devres_lock, flags);
> + return ret;
> +}
--
With Best Regards,
Andy Shevchenko
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH v3 1/3] devres: provide devm_krealloc()
2020-07-11 15:08 ` Andy Shevchenko
@ 2020-07-12 8:19 ` Bartosz Golaszewski
-1 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-12 8:19 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Bartosz Golaszewski, Jonathan Cameron, Hartmut Knaack,
Lars-Peter Clausen, Peter Meerwald-Stadler, Michal Simek,
Greg Kroah-Hartman, Guenter Roeck, linux-iio,
linux-arm Mailing List, Linux Kernel Mailing List
On Sat, Jul 11, 2020 at 5:08 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Fri, Jul 10, 2020 at 7:17 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> >
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > Implement the managed variant of krealloc(). This function works with
> > all memory allocated by devm_kmalloc() (or devres functions using it
> > implicitly like devm_kmemdup(), devm_kstrdup() etc.).
> >
> > Managed realloc'ed chunks can be manually released with devm_kfree().
>
> ...
>
> > devm_kfree()
> > devm_kmalloc()
> > devm_kmalloc_array()
> > + devm_krealloc()
> > devm_kmemdup()
> > devm_kstrdup()
> > devm_kvasprintf()
>
> Order?
>
I didn't notice these were ordered alphabetically, I thought it was by
functionality.
> ...
>
> > +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
>
> Do we really need the 'new_' prefix in the parameter?
>
Yes, I think this is a good name for a function that's meant to modify
the size of a memory chunk.
> > +{
> > + struct devres *old_dr, *new_dr;
> > + struct list_head old_head;
> > + unsigned long flags;
> > + void *ret = NULL;
> > + size_t tot_size;
>
> tot -> total.
>
Meh, ok.
> > +
> > + if (unlikely(!new_size)) {
> > + devm_kfree(dev, ptr);
> > + return ZERO_SIZE_PTR;
> > + }
>
> I guess here we need a comment of the possibilities below to have
> ZERO_SIZE_PTR as input.
>
Better yet: I'll just add a kernel doc for this function.
> > + if (unlikely(ZERO_OR_NULL_PTR(ptr)))
> > + return devm_kmalloc(dev, new_size, gfp);
> > +
> > + if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
> > + /*
> > + * We cannot reliably realloc a const string returned by
> > + * devm_kstrdup_const().
> > + */
> > + return NULL;
> > +
> > + if (!check_dr_size(new_size, &tot_size))
> > + return NULL;
> > +
> > + spin_lock_irqsave(&dev->devres_lock, flags);
> > +
> > + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
>
> > + if (WARN_ON(!old_dr))
>
> Under spin lock? I would rather see spin unlock followed by WARN.
>
Yeah, can be done.
> > + /* Memory chunk not managed or managed by a different device. */
> > + goto out;
> > +
> > + old_head = old_dr->node.entry;
> > +
> > + new_dr = krealloc(old_dr, tot_size, gfp);
> > + if (!new_dr)
> > + goto out;
> > +
> > + if (new_dr != old_dr)
> > + list_replace(&old_head, &new_dr->node.entry);
> > +
> > + ret = new_dr->data;
> > +
> > +out:
> > + spin_unlock_irqrestore(&dev->devres_lock, flags);
> > + return ret;
> > +}
>
> --
> With Best Regards,
> Andy Shevchenko
Bartosz
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH v3 1/3] devres: provide devm_krealloc()
@ 2020-07-12 8:19 ` Bartosz Golaszewski
0 siblings, 0 replies; 12+ messages in thread
From: Bartosz Golaszewski @ 2020-07-12 8:19 UTC (permalink / raw)
To: Andy Shevchenko
Cc: linux-arm Mailing List, Lars-Peter Clausen, linux-iio,
Greg Kroah-Hartman, Bartosz Golaszewski, Michal Simek,
Linux Kernel Mailing List, Guenter Roeck, Peter Meerwald-Stadler,
Hartmut Knaack, Jonathan Cameron
On Sat, Jul 11, 2020 at 5:08 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Fri, Jul 10, 2020 at 7:17 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> >
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > Implement the managed variant of krealloc(). This function works with
> > all memory allocated by devm_kmalloc() (or devres functions using it
> > implicitly like devm_kmemdup(), devm_kstrdup() etc.).
> >
> > Managed realloc'ed chunks can be manually released with devm_kfree().
>
> ...
>
> > devm_kfree()
> > devm_kmalloc()
> > devm_kmalloc_array()
> > + devm_krealloc()
> > devm_kmemdup()
> > devm_kstrdup()
> > devm_kvasprintf()
>
> Order?
>
I didn't notice these were ordered alphabetically, I thought it was by
functionality.
> ...
>
> > +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
>
> Do we really need the 'new_' prefix in the parameter?
>
Yes, I think this is a good name for a function that's meant to modify
the size of a memory chunk.
> > +{
> > + struct devres *old_dr, *new_dr;
> > + struct list_head old_head;
> > + unsigned long flags;
> > + void *ret = NULL;
> > + size_t tot_size;
>
> tot -> total.
>
Meh, ok.
> > +
> > + if (unlikely(!new_size)) {
> > + devm_kfree(dev, ptr);
> > + return ZERO_SIZE_PTR;
> > + }
>
> I guess here we need a comment of the possibilities below to have
> ZERO_SIZE_PTR as input.
>
Better yet: I'll just add a kernel doc for this function.
> > + if (unlikely(ZERO_OR_NULL_PTR(ptr)))
> > + return devm_kmalloc(dev, new_size, gfp);
> > +
> > + if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
> > + /*
> > + * We cannot reliably realloc a const string returned by
> > + * devm_kstrdup_const().
> > + */
> > + return NULL;
> > +
> > + if (!check_dr_size(new_size, &tot_size))
> > + return NULL;
> > +
> > + spin_lock_irqsave(&dev->devres_lock, flags);
> > +
> > + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
>
> > + if (WARN_ON(!old_dr))
>
> Under spin lock? I would rather see spin unlock followed by WARN.
>
Yeah, can be done.
> > + /* Memory chunk not managed or managed by a different device. */
> > + goto out;
> > +
> > + old_head = old_dr->node.entry;
> > +
> > + new_dr = krealloc(old_dr, tot_size, gfp);
> > + if (!new_dr)
> > + goto out;
> > +
> > + if (new_dr != old_dr)
> > + list_replace(&old_head, &new_dr->node.entry);
> > +
> > + ret = new_dr->data;
> > +
> > +out:
> > + spin_unlock_irqrestore(&dev->devres_lock, flags);
> > + return ret;
> > +}
>
> --
> With Best Regards,
> Andy Shevchenko
Bartosz
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2020-07-12 8:21 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-10 16:15 [PATCH v3 0/3] devres: provide and use devm_krealloc() Bartosz Golaszewski
2020-07-10 16:15 ` Bartosz Golaszewski
2020-07-10 16:15 ` [PATCH v3 1/3] devres: provide devm_krealloc() Bartosz Golaszewski
2020-07-10 16:15 ` Bartosz Golaszewski
2020-07-11 15:08 ` Andy Shevchenko
2020-07-11 15:08 ` Andy Shevchenko
2020-07-12 8:19 ` Bartosz Golaszewski
2020-07-12 8:19 ` Bartosz Golaszewski
2020-07-10 16:15 ` [PATCH v3 2/3] hwmon: pmbus: use more devres helpers Bartosz Golaszewski
2020-07-10 16:15 ` Bartosz Golaszewski
2020-07-10 16:15 ` [PATCH v3 3/3] iio: adc: xilinx-xadc: use devm_krealloc() Bartosz Golaszewski
2020-07-10 16:15 ` Bartosz Golaszewski
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