From 4770e68d162634b2134741d08c49185f858c90ee Mon Sep 17 00:00:00 2001
From: Don Brace <don.brace@microsemi.com>
Date: Tue, 7 May 2019 13:32:13 -0500
Subject: scsi: hpsa: check for tag collision

Correct rare multipath issue where a device is deleted with an
outstanding cmd which results in a tag collision.

The cmd eventually completes. If a collision is detected wait until
the command slot is cleared.

Reviewed-by: Justin Lindley <justin.lindley@microsemi.com>
Reviewed-by: David Carroll <david.carroll@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
 drivers/scsi/hpsa.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/scsi/hpsa.h')

diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index 7aa7378f70dd..75210de71917 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -174,6 +174,7 @@ struct ctlr_info {
 	struct CfgTable __iomem *cfgtable;
 	int	interrupts_enabled;
 	int 	max_commands;
+	int	last_collision_tag; /* tags are global */
 	atomic_t commands_outstanding;
 #	define PERF_MODE_INT	0
 #	define DOORBELL_INT	1
-- 
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