4.18-stable review patch. If anyone has any objections, please let me know.
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From: Mikulas Patocka mpatocka@redhat.com
commit 8456b99c16d193c4c3b7df305cf431e027f0189c upstream.
If we leave urbs around, it causes not only leak, but also memory corruption. This patch fixes the function udl_free_urb_list, so that it always waits for all urbs that are in progress.
Signed-off-by: Mikulas Patocka mpatocka@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie airlied@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/udl/udl_main.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
--- a/drivers/gpu/drm/udl/udl_main.c +++ b/drivers/gpu/drm/udl/udl_main.c @@ -170,18 +170,13 @@ static void udl_free_urb_list(struct drm struct list_head *node; struct urb_node *unode; struct urb *urb; - int ret; unsigned long flags;
DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
/* keep waiting and freeing, until we've got 'em all */ while (count--) { - - /* Getting interrupted means a leak, but ok at shutdown*/ - ret = down_interruptible(&udl->urbs.limit_sem); - if (ret) - break; + down(&udl->urbs.limit_sem);
spin_lock_irqsave(&udl->urbs.lock, flags);