Patch "drm/vc4: Release fence after signalling" has been added to the 4.14-stable tree

Patch "drm/vc4: Release fence after signalling" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/vc4: Release fence after signalling

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-vc4-release-fence-after-signalling.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Fri Feb 23 11:45:09 CET 2018
From: Stefan Schake <stschake@gmail.com>
Date: Sat, 2 Dec 2017 18:40:39 +0100
Subject: drm/vc4: Release fence after signalling

From: Stefan Schake <stschake@gmail.com>


[ Upstream commit babc8110057cb9ca542c3c1666cbda4e8ccf9250 ]

We were never releasing the initial fence reference that is obtained
through dma_fence_init.

Link: https://github.com/anholt/linux/issues/122
Fixes: cdec4d361323 ("drm/vc4: Expose dma-buf fences for V3D rendering.")
Signed-off-by: Stefan Schake <stschake@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/1512236444-301-1-git-send-email-stschake@gmail.com
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/vc4/vc4_gem.c |    4 +++-
 drivers/gpu/drm/vc4/vc4_irq.c |    1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -829,8 +829,10 @@ vc4_complete_exec(struct drm_device *dev
 	/* If we got force-completed because of GPU reset rather than
 	 * through our IRQ handler, signal the fence now.
 	 */
-	if (exec->fence)
+	if (exec->fence) {
 		dma_fence_signal(exec->fence);
+		dma_fence_put(exec->fence);
+	}
 
 	if (exec->bo) {
 		for (i = 0; i < exec->bo_count; i++)
--- a/drivers/gpu/drm/vc4/vc4_irq.c
+++ b/drivers/gpu/drm/vc4/vc4_irq.c
@@ -139,6 +139,7 @@ vc4_irq_finish_render_job(struct drm_dev
 	list_move_tail(&exec->head, &vc4->job_done_list);
 	if (exec->fence) {
 		dma_fence_signal_locked(exec->fence);
+		dma_fence_put(exec->fence);
 		exec->fence = NULL;
 	}
 	vc4_submit_next_render_job(dev);


Patches currently in stable-queue which might be from stschake@gmail.com are

queue-4.14/drm-vc4-release-fence-after-signalling.patch