linux-kernel - [PATCH v2 01/11] drm/vgem: Use ww_mutex

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Date:   Thu,  1 Dec 2016 15:06:44 +0100
From:   Nicolai Hähnle <nhaehnle@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Nicolai Hähnle <Nicolai.Haehnle@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Maarten Lankhorst <dev@...ankhorst.nl>,
        Daniel Vetter <daniel@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 01/11] drm/vgem: Use ww_mutex_(un)lock even with a NULL context

From: Nicolai Hähnle <Nicolai.Haehnle@....com>

v2: use resv->lock instead of resv->lock.base (Christian König)

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Maarten Lankhorst <dev@...ankhorst.nl>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Nicolai Hähnle <Nicolai.Haehnle@....com>
---
 drivers/gpu/drm/vgem/vgem_fence.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
index 488909a..9cb00a5 100644
--- a/drivers/gpu/drm/vgem/vgem_fence.c
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -191,12 +191,12 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,
 
 	/* Expose the fence via the dma-buf */
 	ret = 0;
-	mutex_lock(&resv->lock.base);
+	ww_mutex_lock(&resv->lock, NULL);
 	if (arg->flags & VGEM_FENCE_WRITE)
 		reservation_object_add_excl_fence(resv, fence);
 	else if ((ret = reservation_object_reserve_shared(resv)) == 0)
 		reservation_object_add_shared_fence(resv, fence);
-	mutex_unlock(&resv->lock.base);
+	ww_mutex_unlock(&resv->lock);
 
 	/* Record the fence in our idr for later signaling */
 	if (ret == 0) {
-- 
2.7.4