From: Stephen M. Cameron Date: Thu, 21 Jul 2011 18:16:05 +0000 (-0500) Subject: [SCSI] hpsa: do not attempt to read from a write-only register X-Git-Tag: firefly_0821_release~3680^2~4805^2~29 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fec62c368b9c8b05d5124ca6c3b8336b537f26f3;p=firefly-linux-kernel-4.4.55.git [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: Stephen M. Cameron Cc: stable@kernel.org Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index 6d8dcd4dd06b..7f53ceaa7239 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -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;