diff mbox

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

Message ID 55DEFB51.4040507@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Maarten Lankhorst Aug. 27, 2015, 11:58 a.m. UTC 
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>
---

Comments

Daniel Vetter Sept. 2, 2015, 9:19 a.m. UTC | #1 
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
diff mbox

Patch

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