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xen-scsifront: don't deadlock if the ring becomes full 

scsifront_action_handler() will deadlock on host->host_lock, if the
ring is full and it has to wait for entries to become available.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
David Vrabel 2014-09-11 14:20:04 +01:00
parent f955371ca9
commit 7921a11c7b
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/xen-scsifront.c
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@ -541,8 +541,9 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
if (!shadow) if (!shadow)
return FAILED; return FAILED;
spin_lock_irq(host->host_lock);
for (;;) { for (;;) {
spin_lock_irq(host->host_lock);
if (!RING_FULL(&info->ring)) { if (!RING_FULL(&info->ring)) {
ring_req = scsifront_command2ring(info, sc, shadow); ring_req = scsifront_command2ring(info, sc, shadow);
if (ring_req) if (ring_req)