linux-kernel - [064/102] cciss: do not attempt to read from a write-only register

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Message-Id: <20110803221250.479789938@clark.kroah.org>
Date:	Wed, 03 Aug 2011 15:01:24 -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>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: [064/102] cciss: 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 07d0c38e7d84f911c72058a124c7f17b3c779a65 upstream.

Most smartarrays will tolerate it, but some new ones don't.

Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>

Note: this is a regression caused by commit 1ddd5049
Signed-off-by: Jens Axboe <jaxboe@...ionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -223,7 +223,7 @@ static void SA5_submit_command( ctlr_inf
 			h->ctlr, c->busaddr);
 #endif /* CCISS_DEBUG */
          writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
-	readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
+	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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