linux-kernel - [PATCH 2/4] scsi: pmcraid: fix lock imbalance in pmcraid_reset

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Date:   Thu, 20 Apr 2017 19:54:46 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, stable@...r.kernel.org,
        Johannes Berg <johannes.berg@...el.com>,
        Quentin Lambert <lambert.quentin@...il.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] scsi: pmcraid: fix lock imbalance in pmcraid_reset_reload()

sparse found a bug that has always been present since the driver
was merged:

drivers/scsi/pmcraid.c:2353:12: warning: context imbalance in 'pmcraid_reset_reload' - different lock contexts for basic block

This adds the missing unlock at the end of the function. I could
not figure out if this will happen in practice, but I could not
prove that it doesn't happen, so to be on the safe side, let's
backport this fix.

Cc: stable@...r.kernel.org
Fixes: 89a368104150 ("[SCSI] pmcraid: PMC-Sierra MaxRAID driver to support 6Gb/s SAS RAID controller")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/pmcraid.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index 096c704ca39a..35087e94c2ad 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -2411,8 +2411,11 @@ static int pmcraid_reset_reload(
 		scsi_unblock_requests(pinstance->host);
 		if (pinstance->ioa_state == target_state)
 			reset = 0;
+		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 	}
 
+	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+
 	return reset;
 }
 
-- 
2.9.0