[PATCH] drm/atomic: Make sure lock is held in trylock contexts.

[PATCH] drm/atomic: Make sure lock is held in trylock contexts.

[Maarten Lankhorst]

This will make sure we get a lockdep spat in all cases
even if the context is a complete garbage pointer.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 9abee87c1501..7c9ca2381d78 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -305,6 +305,8 @@ static inline int modeset_lock(struct drm_modeset_lock *lock,
 	WARN_ON(ctx->contended);
 
 	if (ctx->trylock_only) {
+		lockdep_assert_held(&ctx->ww_ctx);
+
 		if (!ww_mutex_trylock(&lock->mutex))
 			return -EBUSY;
 		else

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Re: [PATCH] drm/atomic: Make sure lock is held in trylock contexts.

[shuang.he]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
Task id: 7273
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                                  302/302              302/302
SNB                                  315/315              315/315
IVB                                  336/336              336/336
BYT                 -2              283/283              281/283
HSW                                  378/378              378/378
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*BYT  igt@gem_partial_pwrite_pread@reads-uncached      PASS(1)      FAIL(1)
*BYT  igt@gem_tiled_partial_pwrite_pread@reads      PASS(1)      FAIL(1)
Note: You need to pay more attention to line start with '*'
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Re: [PATCH] drm/atomic: Make sure lock is held in trylock contexts.

[Daniel Vetter]

On Thu, Aug 27, 2015 at 01:58:09PM +0200, Maarten Lankhorst wrote:
> This will make sure we get a lockdep spat in all cases
> even if the context is a complete garbage pointer.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

Applied to drm-misc, thanks.
-Daniel

> ---
> diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
> index 9abee87c1501..7c9ca2381d78 100644
> --- a/drivers/gpu/drm/drm_modeset_lock.c
> +++ b/drivers/gpu/drm/drm_modeset_lock.c
> @@ -305,6 +305,8 @@ static inline int modeset_lock(struct drm_modeset_lock *lock,
>  	WARN_ON(ctx->contended);
>  
>  	if (ctx->trylock_only) {
> +		lockdep_assert_held(&ctx->ww_ctx);
> +
>  		if (!ww_mutex_trylock(&lock->mutex))
>  			return -EBUSY;
>  		else
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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