a7y18lte-ubports/android_kernel_samsung_universal7885
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udl-kms: change down_interruptible to down

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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>
This commit is contained in:
Mikulas Patocka 2018-06-03 16:40:55 +02:00 committed by Greg Kroah-Hartman
parent 84c7c90102
commit f56d71483e
1 changed files with 1 additions and 6 deletions
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7
drivers/gpu/drm/udl/udl_main.c
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@ -141,18 +141,13 @@ static void udl_free_urb_list(struct drm_device *dev)
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);