linux-kernel - [PATCH 2.6.32 56/62] libata: increase the timeout when setting transfer mode

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Date:	Sun, 13 Sep 2015 00:57:02 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Mikulas Patocka <mpatocka@...hat.com>, Tejun Heo <tj@...nel.org>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 56/62] libata: increase the timeout when setting transfer
 mode

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Mikulas Patocka <mpatocka@...hat.com>

commit d531be2ca2f27cca5f041b6a140504999144a617 upstream.

I have a ST4000DM000 disk. If Linux is booted while the disk is spun down,
the command that sets transfer mode causes the disk to spin up. The
spin-up takes longer than the default 5s timeout, so the command fails and
timeout is reported.

Fix this by increasing the timeout to 15s, which is enough for the disk to
spin up.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit d6ded32444c070ce41ad0d64fce8957d18009d72)

Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/ata/libata-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d4f7f99..a61b4c3 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4635,7 +4635,8 @@ static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
 	else /* In the ancient relic department - skip all of this */
 		return 0;
 
-	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+	/* On some disks, this command causes spin-up, so we need longer timeout */
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 15000);
 
 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
 	return err_mask;
-- 
1.7.12.2.21.g234cd45.dirty



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