[PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Dan Carpenter]

We already unlocked a few lines earlier so this code unlocks twice on
the success path.

Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for smu11 (v2)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I'm not sure what this bug looks like at runtime, but it's slightly
weird that no one noticed.  This is from static analysis and I haven't
tested it myself.

 drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index 00b7c885772b..7e8c74da6a74 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,  void *buf, size_t size)
 	if (ret)
 		pr_info("smu reset failed, ret = %d\n", ret);
 
+	return ret;
+
 failed:
 	mutex_unlock(&smu->mutex);
 	return ret;
-- 
2.17.1

[PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Dan Carpenter]

We already unlocked a few lines earlier so this code unlocks twice on
the success path.

Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for smu11 (v2)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I'm not sure what this bug looks like at runtime, but it's slightly
weird that no one noticed.  This is from static analysis and I haven't
tested it myself.

 drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index 00b7c885772b..7e8c74da6a74 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,  void *buf, size_t size)
 	if (ret)
 		pr_info("smu reset failed, ret = %d\n", ret);
 
+	return ret;
+
 failed:
 	mutex_unlock(&smu->mutex);
 	return ret;
-- 
2.17.1

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RE: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Huang, Ray]

> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> Sent: Thursday, March 21, 2019 2:28 PM
> To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> <Kevin1.Wang@amd.com>
> Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> smu_sys_set_pp_table()
> 
> We already unlocked a few lines earlier so this code unlocks twice on the
> success path.
> 
> Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> smu11 (v2)")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Nice catch!  Thanks, Dan.
Kevin, could you please verify this patch.
Reviewed-by: Huang Rui <ray.huang@amd.com>

> ---
> I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> one noticed.  This is from static analysis and I haven't tested it myself.
> 
>  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> index 00b7c885772b..7e8c74da6a74 100644
> --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> void *buf, size_t size)
>  	if (ret)
>  		pr_info("smu reset failed, ret = %d\n", ret);
> 
> +	return ret;
> +
>  failed:
>  	mutex_unlock(&smu->mutex);
>  	return ret;
> --
> 2.17.1

RE: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Huang, Ray]

> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> Sent: Thursday, March 21, 2019 2:28 PM
> To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> <Kevin1.Wang@amd.com>
> Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> smu_sys_set_pp_table()
> 
> We already unlocked a few lines earlier so this code unlocks twice on the
> success path.
> 
> Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> smu11 (v2)")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Nice catch!  Thanks, Dan.
Kevin, could you please verify this patch.
Reviewed-by: Huang Rui <ray.huang@amd.com>

> ---
> I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> one noticed.  This is from static analysis and I haven't tested it myself.
> 
>  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> index 00b7c885772b..7e8c74da6a74 100644
> --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> void *buf, size_t size)
>  	if (ret)
>  		pr_info("smu reset failed, ret = %d\n", ret);
> 
> +	return ret;
> +
>  failed:
>  	mutex_unlock(&smu->mutex);
>  	return ret;
> --
> 2.17.1

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Re: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Wang, Kevin(Yang)]

[-- Attachment #1.1: Type: text/plain, Size: 1843 bytes --]

Hi Dan,


Thank you for your careful attention to the problem.
I made the mistake of this patch, when we do code rebase internally.
and your patch is looks fine for me.

Reviewed-by: Kevin Wang <kevin1.wang-5C7GfCeVMHo@public.gmane.org>
Thanks.

Best Regards,
Kevin


________________________________
From: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Sent: Thursday, March 21, 2019 2:28:22 PM
To: Deucher, Alexander; Wang, Kevin(Yang)
Cc: Koenig, Christian; Zhou, David(ChunMing); David Airlie; Daniel Vetter; Huang, Ray; Gao, Likun; Gui, Jack; amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org; kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

We already unlocked a few lines earlier so this code unlocks twice on
the success path.

Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for smu11 (v2)")
Signed-off-by: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
I'm not sure what this bug looks like at runtime, but it's slightly
weird that no one noticed.  This is from static analysis and I haven't
tested it myself.

 drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index 00b7c885772b..7e8c74da6a74 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,  void *buf, size_t size)
         if (ret)
                 pr_info("smu reset failed, ret = %d\n", ret);

+       return ret;
+
 failed:
         mutex_unlock(&smu->mutex);
         return ret;
--
2.17.1


[-- Attachment #1.2: Type: text/html, Size: 3395 bytes --]

[-- Attachment #2: Type: text/plain, Size: 153 bytes --]

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RE: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Julia Lawall]

On Thu, 21 Mar 2019, Huang, Ray wrote:

> > -----Original Message-----
> > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > Sent: Thursday, March 21, 2019 2:28 PM
> > To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> > <Kevin1.Wang@amd.com>
> > Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> > <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> > <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> > gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> > Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> > smu_sys_set_pp_table()
> >
> > We already unlocked a few lines earlier so this code unlocks twice on the
> > success path.
> >
> > Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> > smu11 (v2)")
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> Nice catch!  Thanks, Dan.
> Kevin, could you please verify this patch.
> Reviewed-by: Huang Rui <ray.huang@amd.com>
>
> > ---
> > I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> > one noticed.  This is from static analysis and I haven't tested it myself.
> >
> >  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > index 00b7c885772b..7e8c74da6a74 100644
> > --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> > void *buf, size_t size)
> >  	if (ret)
> >  		pr_info("smu reset failed, ret = %d\n", ret);
> >
> > +	return ret;

Why not return 0?

julia

> > +
> >  failed:
> >  	mutex_unlock(&smu->mutex);
> >  	return ret;
> > --
> > 2.17.1
>
>

RE: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Julia Lawall]

On Thu, 21 Mar 2019, Huang, Ray wrote:

> > -----Original Message-----
> > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > Sent: Thursday, March 21, 2019 2:28 PM
> > To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> > <Kevin1.Wang@amd.com>
> > Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> > <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> > <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> > gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> > Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> > smu_sys_set_pp_table()
> >
> > We already unlocked a few lines earlier so this code unlocks twice on the
> > success path.
> >
> > Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> > smu11 (v2)")
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> Nice catch!  Thanks, Dan.
> Kevin, could you please verify this patch.
> Reviewed-by: Huang Rui <ray.huang@amd.com>
>
> > ---
> > I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> > one noticed.  This is from static analysis and I haven't tested it myself.
> >
> >  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > index 00b7c885772b..7e8c74da6a74 100644
> > --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> > void *buf, size_t size)
> >  	if (ret)
> >  		pr_info("smu reset failed, ret = %d\n", ret);
> >
> > +	return ret;

Why not return 0?

julia

> > +
> >  failed:
> >  	mutex_unlock(&smu->mutex);
> >  	return ret;
> > --
> > 2.17.1
>
>
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Re: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Dan Carpenter]

On Thu, Mar 21, 2019 at 09:20:38AM +0100, Julia Lawall wrote:
> 
> 
> On Thu, 21 Mar 2019, Huang, Ray wrote:
> 
> > > -----Original Message-----
> > > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > > Sent: Thursday, March 21, 2019 2:28 PM
> > > To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> > > <Kevin1.Wang@amd.com>
> > > Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> > > <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > > <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> > > <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> > > gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> > > Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> > > smu_sys_set_pp_table()
> > >
> > > We already unlocked a few lines earlier so this code unlocks twice on the
> > > success path.
> > >
> > > Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> > > smu11 (v2)")
> > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >
> > Nice catch!  Thanks, Dan.
> > Kevin, could you please verify this patch.
> > Reviewed-by: Huang Rui <ray.huang@amd.com>
> >
> > > ---
> > > I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> > > one noticed.  This is from static analysis and I haven't tested it myself.
> > >
> > >  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > index 00b7c885772b..7e8c74da6a74 100644
> > > --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> > > void *buf, size_t size)
> > >  	if (ret)
> > >  		pr_info("smu reset failed, ret = %d\n", ret);
> > >
> > > +	return ret;
> 
> Why not return 0?

It's not necessarily zero.

regards,
dan carpenter

Re: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Dan Carpenter]

On Thu, Mar 21, 2019 at 09:20:38AM +0100, Julia Lawall wrote:
> 
> 
> On Thu, 21 Mar 2019, Huang, Ray wrote:
> 
> > > -----Original Message-----
> > > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > > Sent: Thursday, March 21, 2019 2:28 PM
> > > To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> > > <Kevin1.Wang@amd.com>
> > > Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> > > <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > > <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> > > <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> > > gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> > > Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> > > smu_sys_set_pp_table()
> > >
> > > We already unlocked a few lines earlier so this code unlocks twice on the
> > > success path.
> > >
> > > Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> > > smu11 (v2)")
> > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >
> > Nice catch!  Thanks, Dan.
> > Kevin, could you please verify this patch.
> > Reviewed-by: Huang Rui <ray.huang@amd.com>
> >
> > > ---
> > > I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> > > one noticed.  This is from static analysis and I haven't tested it myself.
> > >
> > >  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > index 00b7c885772b..7e8c74da6a74 100644
> > > --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> > > void *buf, size_t size)
> > >  	if (ret)
> > >  		pr_info("smu reset failed, ret = %d\n", ret);
> > >
> > > +	return ret;
> 
> Why not return 0?

It's not necessarily zero.

regards,
dan carpenter

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Re: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Julia Lawall]

On Thu, 21 Mar 2019, Dan Carpenter wrote:

> On Thu, Mar 21, 2019 at 09:20:38AM +0100, Julia Lawall wrote:
> >
> >
> > On Thu, 21 Mar 2019, Huang, Ray wrote:
> >
> > > > -----Original Message-----
> > > > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > > > Sent: Thursday, March 21, 2019 2:28 PM
> > > > To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> > > > <Kevin1.Wang@amd.com>
> > > > Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> > > > <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > > > <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> > > > <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> > > > gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> > > > Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> > > > smu_sys_set_pp_table()
> > > >
> > > > We already unlocked a few lines earlier so this code unlocks twice on the
> > > > success path.
> > > >
> > > > Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> > > > smu11 (v2)")
> > > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> > >
> > > Nice catch!  Thanks, Dan.
> > > Kevin, could you please verify this patch.
> > > Reviewed-by: Huang Rui <ray.huang@amd.com>
> > >
> > > > ---
> > > > I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> > > > one noticed.  This is from static analysis and I haven't tested it myself.
> > > >
> > > >  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > index 00b7c885772b..7e8c74da6a74 100644
> > > > --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> > > > void *buf, size_t size)
> > > >  	if (ret)
> > > >  		pr_info("smu reset failed, ret = %d\n", ret);
> > > >
> > > > +	return ret;
> >
> > Why not return 0?
>
> It's not necessarily zero.

Oops, I was looking at the invisble goto after the pr_info :)

julia

Re: [PATCH] drm/amd/powerplay: Fix double unlock bug in smu_sys_set_pp_table()

[Julia Lawall]

On Thu, 21 Mar 2019, Dan Carpenter wrote:

> On Thu, Mar 21, 2019 at 09:20:38AM +0100, Julia Lawall wrote:
> >
> >
> > On Thu, 21 Mar 2019, Huang, Ray wrote:
> >
> > > > -----Original Message-----
> > > > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > > > Sent: Thursday, March 21, 2019 2:28 PM
> > > > To: Deucher, Alexander <Alexander.Deucher@amd.com>; Wang, Kevin(Yang)
> > > > <Kevin1.Wang@amd.com>
> > > > Cc: Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> > > > <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
> > > > <daniel@ffwll.ch>; Huang, Ray <Ray.Huang@amd.com>; Gao, Likun
> > > > <Likun.Gao@amd.com>; Gui, Jack <Jack.Gui@amd.com>; amd-
> > > > gfx@lists.freedesktop.org; kernel-janitors@vger.kernel.org
> > > > Subject: [PATCH] drm/amd/powerplay: Fix double unlock bug in
> > > > smu_sys_set_pp_table()
> > > >
> > > > We already unlocked a few lines earlier so this code unlocks twice on the
> > > > success path.
> > > >
> > > > Fixes: 5809d7420f97 ("drm/amd/powerplay: implement sysfs of pp_table for
> > > > smu11 (v2)")
> > > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> > >
> > > Nice catch!  Thanks, Dan.
> > > Kevin, could you please verify this patch.
> > > Reviewed-by: Huang Rui <ray.huang@amd.com>
> > >
> > > > ---
> > > > I'm not sure what this bug looks like at runtime, but it's slightly weird that no
> > > > one noticed.  This is from static analysis and I haven't tested it myself.
> > > >
> > > >  drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > index 00b7c885772b..7e8c74da6a74 100644
> > > > --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
> > > > @@ -187,6 +187,8 @@ int smu_sys_set_pp_table(struct smu_context *smu,
> > > > void *buf, size_t size)
> > > >  	if (ret)
> > > >  		pr_info("smu reset failed, ret = %d\n", ret);
> > > >
> > > > +	return ret;
> >
> > Why not return 0?
>
> It's not necessarily zero.

Oops, I was looking at the invisble goto after the pr_info :)

julia
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