[PATCH 0/3] [media] DaVinci-VPBE-Display: Adjustments for some function implementations

[PATCH 0/3] [media] DaVinci-VPBE-Display: Adjustments for some function implementations

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 8 Sep 2017 14:12:10 +0200

Three update suggestions were taken into account
from static source code analysis.

Markus Elfring (3):
  Delete an error message for a failed memory allocation in init_vpbe_layer()
  Improve a size determination in two functions
  Adjust 12 checks for null pointers

 drivers/media/platform/davinci/vpbe_display.c | 37 +++++++++++----------------
 1 file changed, 15 insertions(+), 22 deletions(-)

-- 
2.14.1

[PATCH 1/3] [media] DaVinci-VPBE-Display: Delete an error message for a failed memory allocation in init_vpbe_layer()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Thu, 7 Sep 2017 22:37:16 +0200

Omit an extra message for a memory allocation failure in this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/media/platform/davinci/vpbe_display.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/davinci/vpbe_display.c b/drivers/media/platform/davinci/vpbe_display.c
index 13d027031ff0..5b6fc550736b 100644
--- a/drivers/media/platform/davinci/vpbe_display.c
+++ b/drivers/media/platform/davinci/vpbe_display.c
@@ -1313,7 +1313,6 @@ static int init_vpbe_layer(int i, struct vpbe_display *disp_dev,
-	if (!disp_dev->dev[i]) {
-		printk(KERN_ERR "ran out of memory\n");
+	if (!disp_dev->dev[i])
 		return  -ENOMEM;
-	}
+
 	spin_lock_init(&disp_dev->dev[i]->irqlock);
 	mutex_init(&disp_dev->dev[i]->opslock);
 
-- 
2.14.1

[PATCH 2/3] [media] DaVinci-VPBE-Display: Improve a size determination in two functions

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 8 Sep 2017 10:50:32 +0200

Replace the specification of data structures by pointer dereferences
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/media/platform/davinci/vpbe_display.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/davinci/vpbe_display.c b/drivers/media/platform/davinci/vpbe_display.c
index 5b6fc550736b..afe31900f5de 100644
--- a/drivers/media/platform/davinci/vpbe_display.c
+++ b/drivers/media/platform/davinci/vpbe_display.c
@@ -1305,9 +1305,5 @@ static int init_vpbe_layer(int i, struct vpbe_display *disp_dev,
 	struct video_device *vbd = NULL;
 
 	/* Allocate memory for four plane display objects */
-
-	disp_dev->dev[i] =
-		kzalloc(sizeof(struct vpbe_layer), GFP_KERNEL);
-
-	/* If memory allocation fails, return error */
+	disp_dev->dev[i] = kzalloc(sizeof(*disp_dev->dev[i]), GFP_KERNEL);
 	if (!disp_dev->dev[i])
@@ -1396,6 +1392,5 @@ static int vpbe_display_probe(struct platform_device *pdev)
 
 	printk(KERN_DEBUG "vpbe_display_probe\n");
 	/* Allocate memory for vpbe_display */
-	disp_dev = devm_kzalloc(&pdev->dev, sizeof(struct vpbe_display),
-				GFP_KERNEL);
+	disp_dev = devm_kzalloc(&pdev->dev, sizeof(*disp_dev), GFP_KERNEL);
 	if (!disp_dev)
-- 
2.14.1

[PATCH 3/3] [media] DaVinci-VPBE-Display: Adjust 12 checks for null pointers

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Fri, 8 Sep 2017 14:00:20 +0200
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The script “checkpatch.pl” pointed information out like the following.

Comparison to NULL could be written …

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/media/platform/davinci/vpbe_display.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/media/platform/davinci/vpbe_display.c b/drivers/media/platform/davinci/vpbe_display.c
index afe31900f5de..6aabd21fe69f 100644
--- a/drivers/media/platform/davinci/vpbe_display.c
+++ b/drivers/media/platform/davinci/vpbe_display.c
@@ -122,7 +122,7 @@ static irqreturn_t venc_isr(int irq, void *arg)
 	int fid;
 	int i;
 
-	if ((NULL == arg) || (NULL == disp_dev->dev[0]))
+	if (!arg || !disp_dev->dev[0])
 		return IRQ_HANDLED;
 
 	if (venc_is_second_field(disp_dev))
@@ -337,10 +337,10 @@ static void vpbe_stop_streaming(struct vb2_queue *vq)
 		vb2_buffer_done(&layer->cur_frm->vb.vb2_buf,
 				VB2_BUF_STATE_ERROR);
 	} else {
-		if (layer->cur_frm != NULL)
+		if (layer->cur_frm)
 			vb2_buffer_done(&layer->cur_frm->vb.vb2_buf,
 					VB2_BUF_STATE_ERROR);
-		if (layer->next_frm != NULL)
+		if (layer->next_frm)
 			vb2_buffer_done(&layer->next_frm->vb.vb2_buf,
 					VB2_BUF_STATE_ERROR);
 	}
@@ -947,7 +947,7 @@ static int vpbe_display_s_std(struct file *file, void *priv,
 	if (vb2_is_busy(&layer->buffer_queue))
 		return -EBUSY;
 
-	if (NULL != vpbe_dev->ops.s_std) {
+	if (vpbe_dev->ops.s_std) {
 		ret = vpbe_dev->ops.s_std(vpbe_dev, std_id);
 		if (ret) {
 			v4l2_err(&vpbe_dev->v4l2_dev,
@@ -1000,8 +1000,7 @@ static int vpbe_display_enum_output(struct file *file, void *priv,
 	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_ENUM_OUTPUT\n");
 
 	/* Enumerate outputs */
-
-	if (NULL == vpbe_dev->ops.enum_outputs)
+	if (!vpbe_dev->ops.enum_outputs)
 		return -EINVAL;
 
 	ret = vpbe_dev->ops.enum_outputs(vpbe_dev, output);
@@ -1030,7 +1029,7 @@ static int vpbe_display_s_output(struct file *file, void *priv,
 	if (vb2_is_busy(&layer->buffer_queue))
 		return -EBUSY;
 
-	if (NULL == vpbe_dev->ops.set_output)
+	if (!vpbe_dev->ops.set_output)
 		return -EINVAL;
 
 	ret = vpbe_dev->ops.set_output(vpbe_dev, i);
@@ -1077,7 +1076,7 @@ vpbe_display_enum_dv_timings(struct file *file, void *priv,
 	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_ENUM_DV_TIMINGS\n");
 
 	/* Enumerate outputs */
-	if (NULL == vpbe_dev->ops.enum_dv_timings)
+	if (!vpbe_dev->ops.enum_dv_timings)
 		return -EINVAL;
 
 	ret = vpbe_dev->ops.enum_dv_timings(vpbe_dev, timings);
@@ -1292,7 +1291,7 @@ static int vpbe_device_get(struct device *dev, void *data)
 	if (strcmp("vpbe_controller", pdev->name) == 0)
 		vpbe_disp->vpbe_dev = platform_get_drvdata(pdev);
 
-	if (strstr(pdev->name, "vpbe-osd") != NULL)
+	if (strstr(pdev->name, "vpbe-osd"))
 		vpbe_disp->osd_device = platform_get_drvdata(pdev);
 
 	return 0;
@@ -1408,7 +1407,7 @@ static int vpbe_display_probe(struct platform_device *pdev)
 
 	v4l2_dev = &disp_dev->vpbe_dev->v4l2_dev;
 	/* Initialize the vpbe display controller */
-	if (NULL != disp_dev->vpbe_dev->ops.initialize) {
+	if (disp_dev->vpbe_dev->ops.initialize) {
 		err = disp_dev->vpbe_dev->ops.initialize(&pdev->dev,
 							 disp_dev->vpbe_dev);
 		if (err) {
@@ -1476,7 +1475,7 @@ static int vpbe_display_probe(struct platform_device *pdev)
 probe_out:
 	for (k = 0; k < VPBE_DISPLAY_MAX_DEVICES; k++) {
 		/* Unregister video device */
-		if (disp_dev->dev[k] != NULL) {
+		if (disp_dev->dev[k]) {
 			video_unregister_device(&disp_dev->dev[k]->video_dev);
 			kfree(disp_dev->dev[k]);
 		}
@@ -1498,7 +1497,7 @@ static int vpbe_display_remove(struct platform_device *pdev)
 	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_remove\n");
 
 	/* deinitialize the vpbe display controller */
-	if (NULL != vpbe_dev->ops.deinitialize)
+	if (vpbe_dev->ops.deinitialize)
 		vpbe_dev->ops.deinitialize(&pdev->dev, vpbe_dev);
 	/* un-register device */
 	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
-- 
2.14.1

Re: [PATCH 1/3] [media] DaVinci-VPBE-Display: Delete an error message for a failed memory allocation in init_vpbe_layer()

[Lad, Prabhakar]

On Fri, Sep 8, 2017 at 1:31 PM, SF Markus Elfring
<elfring@users.sourceforge.net> wrote:
>
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Thu, 7 Sep 2017 22:37:16 +0200
>
> Omit an extra message for a memory allocation failure in this function.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>

Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Cheers,
--Prabhakar Lad

Re: [PATCH 2/3] [media] DaVinci-VPBE-Display: Improve a size determination in two functions

[Lad, Prabhakar]

On Fri, Sep 8, 2017 at 1:32 PM, SF Markus Elfring
<elfring@users.sourceforge.net> wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Fri, 8 Sep 2017 10:50:32 +0200
>
> Replace the specification of data structures by pointer dereferences
> as the parameter for the operator "sizeof" to make the corresponding size
> determination a bit safer according to the Linux coding style convention.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>

Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Cheers,
--Prabhakar Lad

Re: [PATCH 3/3] [media] DaVinci-VPBE-Display: Adjust 12 checks for null pointers

[Lad, Prabhakar]

On Fri, Sep 8, 2017 at 1:33 PM, SF Markus Elfring
<elfring@users.sourceforge.net> wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Fri, 8 Sep 2017 14:00:20 +0200
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> The script “checkpatch.pl” pointed information out like the following.
>
> Comparison to NULL could be written …
>
> Thus fix the affected source code places.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>

Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Cheers,
--Prabhakar Lad