linux-kernel - [PATCH 1/5] Drivers: scsi: storvsc: Make the scsi timeout a module parameter

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Message-Id: <1370301688-27286-1-git-send-email-kys@microsoft.com>
Date:	Mon,  3 Jun 2013 16:21:24 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, ohering@...e.com,
	jbottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/5] Drivers: scsi: storvsc: Make the scsi timeout a module parameter

The standard scsi timeout is not appropriate in some of the environments where
Hyper-V is deployed. Set this timeout appropriately for all devices managed
by this driver. Further make this a module parameter.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/scsi/storvsc_drv.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 16a3a0c..8d29a95 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -221,6 +221,13 @@ static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
 module_param(storvsc_ringbuffer_size, int, S_IRUGO);
 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
 
+/*
+ * Timeout in seconds for all devices managed by this driver.
+ */
+static int storvsc_timeout = 180;
+module_param(storvsc_timeout, uint, (S_IRUGO | S_IWUSR));
+MODULE_PARM_DESC(storvsc_timeout, "Device timeout (seconds)");
+
 #define STORVSC_MAX_IO_REQUESTS				128
 
 /*
@@ -1204,6 +1211,8 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 
 	blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
 
+	blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
+
 	sdevice->no_write_same = 1;
 
 	return 0;
-- 
1.7.4.1

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