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drm/nouveau: fix another lock unbalance in nouveau_crtc_page_flip

Message ID 536236CD.8040806@canonical.com (mailing list archive)
State New, archived
Headers show

Commit Message

Maarten Lankhorst May 1, 2014, 11:58 a.m. UTC
Fixes a regression introduced by 060810d7abaabca "drm/nouveau: fix locking issues in page flipping paths".
chan->cli->mutex is unlocked a second time in the fail_unreserve path, fix this by moving mutex_unlock down.

Cc: stable@vger.kernel.org # v3.11+
---

Comments

Maarten Lankhorst May 1, 2014, 12:20 p.m. UTC | #1
op 01-05-14 13:58, Maarten Lankhorst schreef:
> Fixes a regression introduced by 060810d7abaabca "drm/nouveau: fix locking issues in page flipping paths".
> chan->cli->mutex is unlocked a second time in the fail_unreserve path, fix this by moving mutex_unlock down.
>
> Cc: stable@vger.kernel.org # v3.11+
> ---
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index 24011596af43..5524a3705224 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -762,9 +762,9 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>      }
>
>      ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
> -    mutex_unlock(&chan->cli->mutex);
>      if (ret)
>          goto fail_unreserve;
> +    mutex_unlock(&chan->cli->mutex);
>
>      /* Update the crtc struct and cleanup */
>      crtc->fb = fb;
>
I had a feeling I missed something here..

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
diff mbox

Patch

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 24011596af43..5524a3705224 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -762,9 +762,9 @@  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
  	}
  
  	ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
-	mutex_unlock(&chan->cli->mutex);
  	if (ret)
  		goto fail_unreserve;
+	mutex_unlock(&chan->cli->mutex);
  
  	/* Update the crtc struct and cleanup */
  	crtc->fb = fb;