2021-08-20 02:12:42

by CGEL

Subject: [PATCH linux-next] : add put_device() after of_find_device_by_node()

This was found by coccicheck:
./drivers/gpu/drm/kmb/kmb_drv.c:503:2-8:
ERROR missing put_device; call of_find_device_by_node on line 490,
but without a corresponding object release within this function.

Reported-by: Zeal Robot <[email protected]>
Signed-off-by: jing yangyang <[email protected]>
---
drivers/gpu/drm/kmb/kmb_drv.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index f54392e..58495a9 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -500,8 +500,10 @@ static int kmb_probe(struct platform_device *pdev)
ret = kmb_dsi_host_bridge_init(get_device(&dsi_pdev->dev));

if (ret == -EPROBE_DEFER) {
+ put_device(&dsi_pdev->dev);
return -EPROBE_DEFER;
} else if (ret) {
+ put_device(&dsi_pdev->dev);
DRM_ERROR("probe failed to initialize DSI host bridge\n");
return ret;
}
@@ -509,9 +511,10 @@ static int kmb_probe(struct platform_device *pdev)
/* Create DRM device */
kmb = devm_drm_dev_alloc(dev, &kmb_driver,
struct kmb_drm_private, drm);
- if (IS_ERR(kmb))
+ if (IS_ERR(kmb)) {
+ put_device(&dsi_pdev->dev);
return PTR_ERR(kmb);
-
+ }
dev_set_drvdata(dev, &kmb->drm);

/* Initialize MIPI DSI */
--
1.8.3.1

2021-08-23 23:28:22

by Chrisanthus, Anitha

Subject: RE: [PATCH linux-next] : add put_device() after of_find_device_by_node()

Acked-by: Anitha Chrisanthus <[email protected]>

> -----Original Message-----
> From: jing yangyang <[email protected]>
> Sent: Thursday, August 19, 2021 7:10 PM
> To: Chrisanthus, Anitha <[email protected]>
> Cc: Dea, Edmund J <[email protected]>; David Airlie <[email protected]>;
> Daniel Vetter <[email protected]>; [email protected]; linux-
> [email protected]; jing yangyang <[email protected]>; Zeal
> Robot <[email protected]>
> Subject: [PATCH linux-next] : add put_device() after of_find_device_by_node()
>
> This was found by coccicheck:
> ./drivers/gpu/drm/kmb/kmb_drv.c:503:2-8:
> ERROR missing put_device; call of_find_device_by_node on line 490,
> but without a corresponding object release within this function.
>
> Reported-by: Zeal Robot <[email protected]>
> Signed-off-by: jing yangyang <[email protected]>
> ---
> drivers/gpu/drm/kmb/kmb_drv.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/kmb/kmb_drv.c
> b/drivers/gpu/drm/kmb/kmb_drv.c
> index f54392e..58495a9 100644
> --- a/drivers/gpu/drm/kmb/kmb_drv.c
> +++ b/drivers/gpu/drm/kmb/kmb_drv.c
> @@ -500,8 +500,10 @@ static int kmb_probe(struct platform_device *pdev)
> ret = kmb_dsi_host_bridge_init(get_device(&dsi_pdev->dev));
>
> if (ret == -EPROBE_DEFER) {
> + put_device(&dsi_pdev->dev);
> return -EPROBE_DEFER;
> } else if (ret) {
> + put_device(&dsi_pdev->dev);
> DRM_ERROR("probe failed to initialize DSI host bridge\n");
> return ret;
> }
> @@ -509,9 +511,10 @@ static int kmb_probe(struct platform_device *pdev)
> /* Create DRM device */
> kmb = devm_drm_dev_alloc(dev, &kmb_driver,
> struct kmb_drm_private, drm);
> - if (IS_ERR(kmb))
> + if (IS_ERR(kmb)) {
> + put_device(&dsi_pdev->dev);
> return PTR_ERR(kmb);
> -
> + }
> dev_set_drvdata(dev, &kmb->drm);
>
> /* Initialize MIPI DSI */
> --
> 1.8.3.1
>

2021-08-26 18:40:05

by Chrisanthus, Anitha

Subject: RE: [PATCH linux-next] : add put_device() after of_find_device_by_node()

Hi Jing,

> -----Original Message-----
> From: Chrisanthus, Anitha
> Sent: Monday, August 23, 2021 4:25 PM
> To: jing yangyang <[email protected]>
> Cc: Dea, Edmund J <[email protected]>; David Airlie <[email protected]>;
> Daniel Vetter <[email protected]>; [email protected]; linux-
> [email protected]; jing yangyang <[email protected]>; Zeal
> Robot <[email protected]>
> Subject: RE: [PATCH linux-next] : add put_device() after
> of_find_device_by_node()
>
Thanks for the patch. Please add drm/kmb: to the subject line and also correct the checkpatch warning.
With that ab.

> Acked-by: Anitha Chrisanthus <[email protected]>
>
> > -----Original Message-----
> > From: jing yangyang <[email protected]>
> > Sent: Thursday, August 19, 2021 7:10 PM
> > To: Chrisanthus, Anitha <[email protected]>
> > Cc: Dea, Edmund J <[email protected]>; David Airlie
> <[email protected]>;
> > Daniel Vetter <[email protected]>; [email protected]; linux-
> > [email protected]; jing yangyang <[email protected]>; Zeal
> > Robot <[email protected]>
> > Subject: [PATCH linux-next] : add put_device() after
> of_find_device_by_node()
> >
> > This was found by coccicheck:
> > ./drivers/gpu/drm/kmb/kmb_drv.c:503:2-8:
> > ERROR missing put_device; call of_find_device_by_node on line 490,
> > but without a corresponding object release within this function.
> >
> > Reported-by: Zeal Robot <[email protected]>
> > Signed-off-by: jing yangyang <[email protected]>
> > ---
> > drivers/gpu/drm/kmb/kmb_drv.c | 7 +++++--
> > 1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/kmb/kmb_drv.c
> > b/drivers/gpu/drm/kmb/kmb_drv.c
> > index f54392e..58495a9 100644
> > --- a/drivers/gpu/drm/kmb/kmb_drv.c
> > +++ b/drivers/gpu/drm/kmb/kmb_drv.c
> > @@ -500,8 +500,10 @@ static int kmb_probe(struct platform_device *pdev)
> > ret = kmb_dsi_host_bridge_init(get_device(&dsi_pdev->dev));
> >
> > if (ret == -EPROBE_DEFER) {
> > + put_device(&dsi_pdev->dev);
> > return -EPROBE_DEFER;
> > } else if (ret) {
> > + put_device(&dsi_pdev->dev);
> > DRM_ERROR("probe failed to initialize DSI host bridge\n");
> > return ret;
> > }
> > @@ -509,9 +511,10 @@ static int kmb_probe(struct platform_device *pdev)
> > /* Create DRM device */
> > kmb = devm_drm_dev_alloc(dev, &kmb_driver,
> > struct kmb_drm_private, drm);
> > - if (IS_ERR(kmb))
> > + if (IS_ERR(kmb)) {
> > + put_device(&dsi_pdev->dev);
> > return PTR_ERR(kmb);
> > -
> > + }
> > dev_set_drvdata(dev, &kmb->drm);
> >
> > /* Initialize MIPI DSI */
> > --
> > 1.8.3.1
> >