linux-kernel - [PATCH for-4.9] drm/virtio: allocate some extra bufs

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Message-Id: <1479200004-18163-1-git-send-email-kraxel@redhat.com>
Date:   Tue, 15 Nov 2016 09:53:23 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH for-4.9] drm/virtio: allocate some extra bufs

virtio-gpu guest driver appearently can run out of buffers.
allocate some extra buffers, as quick stopgap for 4.9.
analyzing root cause and fixing it properly is TBD.

Reported-by: Jiri Slaby <jslaby@...e.cz>
Tested-by: Jiri Slaby <jslaby@...e.cz>
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/virtio/virtgpu_vq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 5a0f8a7..974f941 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -75,7 +75,7 @@ void virtio_gpu_cursor_ack(struct virtqueue *vq)
 int virtio_gpu_alloc_vbufs(struct virtio_gpu_device *vgdev)
 {
 	struct virtio_gpu_vbuffer *vbuf;
-	int i, size, count = 0;
+	int i, size, count = 16;
 	void *ptr;
 
 	INIT_LIST_HEAD(&vgdev->free_vbufs);
-- 
1.8.3.1