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Commit fec62c36 authored by Stephen M. Cameron's avatar Stephen M. Cameron Committed by James Bottomley
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[SCSI] hpsa: do not attempt to read from a write-only register 



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: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: stable@kernel.org
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 8ead0bd1

drivers/scsi/hpsa.h

+1 −1
Original line number Diff line number Diff line
@@ -214,7 +214,7 @@ static void SA5_submit_command(struct ctlr_info *h, 
	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;