linux-kernel - [RFC 3/8] drm/fence: allow fence waiting to be interrupted by userspace

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Date:	Thu, 14 Apr 2016 18:29:36 -0700
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	laurent.pinchart@...asonboard.com, seanpaul@...gle.com,
	marcheu@...gle.com, m.chehab@...sung.com,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: [RFC 3/8] drm/fence: allow fence waiting to be interrupted by userspace

From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

If userspace is running an synchronously atomic commit and interrupts the
atomic operation during fence_wait() it will hang until the timer expires,
so here we change the wait to be interruptible so it stop immediately when
userspace wants to quit.

Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
---
 drivers/gpu/drm/drm_atomic_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 7bf678e..f85ef8c 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1007,7 +1007,7 @@ void drm_atomic_helper_wait_for_fences(struct drm_device *dev,
 
 		WARN_ON(!plane->state->fb);
 
-		fence_wait(plane->state->fence, false);
+		fence_wait(plane->state->fence, true);
 		fence_put(plane->state->fence);
 		plane->state->fence = NULL;
 	}
-- 
2.5.5