linux-kernel - [PATCH] scsi: fix regression that accidentally disabled block-based tcq

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Date:	Fri, 12 Sep 2014 16:00:32 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	SCSI development list <linux-scsi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: fix regression that accidentally disabled block-based
 tcq

Please try the fix below, looks like the commit broke TCQ for all drivers 
using block-level tagging.

---
>From 865a19b760d2786fe37d3b5c151a4ecea4c0e95e Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@....de>
Date: Fri, 12 Sep 2014 16:00:19 -0700
Subject: scsi: fix regression that accidentally disabled block-based tcq

The scsi blk-mq support accidentally flipped a conditional, which lead to
never enabling block based tcq when using the legacy request path.

Fixes: d285203cf647d7c9 scsi: add support for a blk-mq based I/O path.
Reported-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/scsi/scsi_tcq.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index cdcc90b..e645835 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -68,7 +68,7 @@ static inline void scsi_activate_tcq(struct scsi_device *sdev, int depth)
 		return;
 
 	if (!shost_use_blk_mq(sdev->host) &&
-	    blk_queue_tagged(sdev->request_queue))
+	    !blk_queue_tagged(sdev->request_queue))
 		blk_queue_init_tags(sdev->request_queue, depth,
 				    sdev->host->bqt);
 
-- 
1.9.1

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