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[SCSI] hpsa: do readl after writel in main i/o path to ensure commands don't get lost. 

Apparently we've been doin it rong for a decade, but only lately do we
run into problems.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <jbottomley@parallels.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Stephen M. Cameron 2011-05-03 14:58:49 -05:00 committed by James Bottomley
parent 72ef0e5757
commit d0be5ec869
1 changed files with 1 additions and 0 deletions
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1
drivers/scsi/hpsa.h
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@ -212,6 +212,7 @@ static void SA5_submit_command(struct ctlr_info *h,
dev_dbg(&h->pdev->dev, "Sending %x, tag = %x\n", c->busaddr, dev_dbg(&h->pdev->dev, "Sending %x, tag = %x\n", c->busaddr,
c->Header.Tag.lower); c->Header.Tag.lower);
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET); writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
(void) readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
h->commands_outstanding++; h->commands_outstanding++;
if (h->commands_outstanding > h->max_outstanding) if (h->commands_outstanding > h->max_outstanding)
h->max_outstanding = h->commands_outstanding; h->max_outstanding = h->commands_outstanding;