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

[Greg KH]

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

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

From: "Stephen M. Cameron" <scameron@xxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 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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