linux-kernel - [PATCH 5.7 060/124] drm/virtio: fix missing dma_fence_put() in virtio_gpu_execbuffer

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Date:   Mon, 24 Aug 2020 10:29:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xin He <hexin.op@...edance.com>,
        Qi Liu <liuqi.16@...edance.com>,
        Muchun Song <songmuchun@...edance.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 060/124] drm/virtio: fix missing dma_fence_put() in virtio_gpu_execbuffer_ioctl()

From: Qi Liu <liuqi.16@...edance.com>

[ Upstream commit 8b6ec999b198b59ae61e86e70f5e9df73fe4754f ]

We should put the reference count of the fence after calling
virtio_gpu_cmd_submit(). So add the missing dma_fence_put().

Fixes: 2cd7b6f08bc4 ("drm/virtio: add in/out fence support for explicit synchronization")
Co-developed-by: Xin He <hexin.op@...edance.com>
Signed-off-by: Xin He <hexin.op@...edance.com>
Signed-off-by: Qi Liu <liuqi.16@...edance.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200721101647.42653-1-hexin.op@bytedance.com
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 512daff920387..1fc3fa00685d0 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -180,6 +180,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 
 	virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
 			      vfpriv->ctx_id, buflist, out_fence);
+	dma_fence_put(&out_fence->f);
 	virtio_gpu_notify(vgdev);
 	return 0;
 
-- 
2.25.1