linux-kernel - [PATCH 01/16] hpsa: do readl after writel in main i/o path to ensure commands don't get lost.

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Message-ID: <20110503195849.5478.13229.stgit@beardog.cce.hp.com>
Date:	Tue, 03 May 2011 14:58:49 -0500
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	james.bottomley@...senpartnership.com
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	smcameron@...oo.com, thenzl@...hat.com, akpm@...ux-foundation.org,
	mikem@...rdog.cce.hp.com
Subject: [PATCH 01/16] hpsa: do readl after writel in main i/o path to ensure
	commands don't get lost.

From: Stephen M. Cameron <scameron@...rdog.cce.hp.com>

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@...rdog.cce.hp.com>
---
 drivers/scsi/hpsa.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index 621a153..98c97ca 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -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,
 		c->Header.Tag.lower);
 	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
+	(void) readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
 	h->commands_outstanding++;
 	if (h->commands_outstanding > h->max_outstanding)
 		h->max_outstanding = h->commands_outstanding;

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