linux-kernel - [046/102] [SCSI] hpsa: do not attempt to read from a write-only register

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Message-Id: <20110803221248.602480485@clark.kroah.org>
Date:	Wed, 03 Aug 2011 15:01:06 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [046/102] [SCSI] hpsa: do not attempt to read from a write-only register

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: "Stephen M. Cameron" <scameron@...rdog.cce.hp.com>

commit fec62c368b9c8b05d5124ca6c3b8336b537f26f3 upstream.

Most smartarrays tolerate it, but a few new ones don't.
Without this change some newer Smart Arrays will lock up
and i/o will grind to a halt.

Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/hpsa.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -214,7 +214,7 @@ static void SA5_submit_command(struct ct
 	dev_dbg(&h->pdev->dev, "Sending %x, tag = %x\n", c->busaddr,
 		c->Header.Tag.lower);
 	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
-	(void) readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
+	(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
 	h->commands_outstanding++;
 	if (h->commands_outstanding > h->max_outstanding)
 		h->max_outstanding = h->commands_outstanding;


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