From 7921a11c7b2929f3ed6fe9081edcf695c60b23c6 Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@citrix.com>
Date: Thu, 11 Sep 2014 14:20:04 +0100
Subject: [PATCH] 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>
---
drivers/scsi/xen-scsifront.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 7e88659bf5af9b..cc14c8ddd36958 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -541,8 +541,9 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
if (!shadow)
return FAILED;
+ spin_lock_irq(host->host_lock);
+
for (;;) {
- spin_lock_irq(host->host_lock);
if (!RING_FULL(&info->ring)) {
ring_req = scsifront_command2ring(info, sc, shadow);
if (ring_req)
--
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