Commit 7921a11c authored Sep 11, 2014 by David Vrabel

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>

parent f955371c

drivers/scsi/xen-scsifront.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -541,8 +541,9 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
		if (!shadow)
		return FAILED;

		for (;;) {
		spin_lock_irq(host->host_lock);

		for (;;) {
		if (!RING_FULL(&info->ring)) {
		ring_req = scsifront_command2ring(info, sc, shadow);
		if (ring_req)