[2/2] drm/auth: drop unnessesary variable assignments
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Message ID 20200529214807.3801851-2-emil.l.velikov@gmail.com
State New
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Series
  • [1/2] drm: vmwgfx: remove drm_driver::master_set() return typ
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Commit Message

Emil Velikov May 29, 2020, 9:48 p.m. UTC
The variables are already the exact same value or will be overwritten
shortly afterwords. In either case there's no functional difference.

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
---
 drivers/gpu/drm/drm_auth.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Comments

Sam Ravnborg May 30, 2020, 7:48 a.m. UTC | #1
Hi Emil.

On Fri, May 29, 2020 at 10:48:07PM +0100, Emil Velikov wrote:
> The variables are already the exact same value or will be overwritten
> shortly afterwords. In either case there's no functional difference.
s/afterwords/afterwards/

> 
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
> ---
>  drivers/gpu/drm/drm_auth.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
> index db701a9e9393..5ae5623f2482 100644
> --- a/drivers/gpu/drm/drm_auth.c
> +++ b/drivers/gpu/drm/drm_auth.c
> @@ -215,7 +215,7 @@ drm_master_check_perm(struct drm_device *dev, struct drm_file *file_priv)
>  int drm_setmaster_ioctl(struct drm_device *dev, void *data,
>  			struct drm_file *file_priv)
>  {
> -	int ret = 0;
> +	int ret;

This was the redundant asignment I mentioned in first mail - good.
>  
>  	mutex_lock(&dev->master_mutex);
>  
> @@ -282,7 +282,6 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
>  
>  	if (file_priv->master->lessor != NULL) {
>  		DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id);
> -		ret = -EINVAL;
This is wrong. ret is 0 when this code is reached, so we loose the error
value if this code-path is triggered.
Or I miss something??

	Sam
>  		goto out_unlock;
>  	}
>  
> -- 
> 2.25.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Emil Velikov May 30, 2020, 12:13 p.m. UTC | #2
On Sat, 30 May 2020 at 08:48, Sam Ravnborg <sam@ravnborg.org> wrote:
>
> Hi Emil.
>
> On Fri, May 29, 2020 at 10:48:07PM +0100, Emil Velikov wrote:
> > The variables are already the exact same value or will be overwritten
> > shortly afterwords. In either case there's no functional difference.
> s/afterwords/afterwards/
>
> >
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
> > ---
> >  drivers/gpu/drm/drm_auth.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
> > index db701a9e9393..5ae5623f2482 100644
> > --- a/drivers/gpu/drm/drm_auth.c
> > +++ b/drivers/gpu/drm/drm_auth.c
> > @@ -215,7 +215,7 @@ drm_master_check_perm(struct drm_device *dev, struct drm_file *file_priv)
> >  int drm_setmaster_ioctl(struct drm_device *dev, void *data,
> >                       struct drm_file *file_priv)
> >  {
> > -     int ret = 0;
> > +     int ret;
>
> This was the redundant asignment I mentioned in first mail - good.
> >
> >       mutex_lock(&dev->master_mutex);
> >
> > @@ -282,7 +282,6 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
> >
> >       if (file_priv->master->lessor != NULL) {
> >               DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id);
> > -             ret = -EINVAL;
> This is wrong. ret is 0 when this code is reached, so we loose the error
> value if this code-path is triggered.
> Or I miss something??
>
A few lines above [1] - there's unconditional ret = -EINVAL. Although
the set<>drop paths are pretty asymmetric and misleading.
Let me respin the series.

-Emil

[1] https://cgit.freedesktop.org/drm/drm-misc/tree/drivers/gpu/drm/drm_auth.c?id=6015002ece38dac85a373f041e0302781de7474b#n293

Patch
diff mbox series

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index db701a9e9393..5ae5623f2482 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -215,7 +215,7 @@  drm_master_check_perm(struct drm_device *dev, struct drm_file *file_priv)
 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv)
 {
-	int ret = 0;
+	int ret;
 
 	mutex_lock(&dev->master_mutex);
 
@@ -282,7 +282,6 @@  int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 
 	if (file_priv->master->lessor != NULL) {
 		DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id);
-		ret = -EINVAL;
 		goto out_unlock;
 	}