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Merge branch 'stable/for-jens-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus 

Pull xen-blkback fix from Konrad:

"[...] A bug-fix when shutting down xen block backend driver with
 multiple queues and the driver not clearing all of them."
This commit is contained in:
Jens Axboe 2017-08-29 08:32:58 -06:00
parent 22d538213e dc52d783d6
commit 015a2f823e
1 changed files with 8 additions and 2 deletions
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10
drivers/block/xen-blkback/xenbus.c
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@ -244,6 +244,7 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif)
{
struct pending_req *req, *n;
unsigned int j, r;
bool busy = false;
for (r = 0; r < blkif->nr_rings; r++) {
struct xen_blkif_ring *ring = &blkif->rings[r];
@ -261,8 +262,10 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif)
* don't have any discard_io or other_io requests. So, checking
* for inflight IO is enough.
*/
if (atomic_read(&ring->inflight) > 0)
return -EBUSY;
if (atomic_read(&ring->inflight) > 0) {
busy = true;
continue;
}
if (ring->irq) {
unbind_from_irqhandler(ring->irq, ring);
@ -300,6 +303,9 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif)
WARN_ON(i != (XEN_BLKIF_REQS_PER_PAGE * blkif->nr_ring_pages));
ring->active = false;
}
if (busy)
return -EBUSY;
blkif->nr_ring_pages = 0;
/*
* blkif->rings was allocated in connect_ring, so we should free it in