linux-kernel - [PATCH 23 of 28] IB/ipath - fix EEPROM read when driver is compiled with -Os

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Message-Id: <6a9a67c2b35aa7f6636f.1159459219@eng-12.pathscale.com>
Date:	Thu, 28 Sep 2006 09:00:19 -0700
From:	Bryan O'Sullivan <bos@...hscale.com>
To:	rdreier@...co.com
Cc:	linux-kernel@...r.kernel.org, openib-general@...nib.org
Subject: [PATCH 23 of 28] IB/ipath - fix EEPROM read when driver is compiled
	with -Os

The EEPROM is read via programmable I/O pins. When the driver
is compiled -Os, the CPU can speculatively read the I/O
value before it is valid.  This patch fixes the problem.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@...gic.com>

diff -r 5aea5f31529d -r 6a9a67c2b35a drivers/infiniband/hw/ipath/ipath_eeprom.c
--- a/drivers/infiniband/hw/ipath/ipath_eeprom.c	Thu Sep 28 08:57:13 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_eeprom.c	Thu Sep 28 08:57:13 2006 -0700
@@ -187,6 +187,7 @@ static void i2c_wait_for_writes(struct i
 static void i2c_wait_for_writes(struct ipath_devdata *dd)
 {
 	(void)ipath_read_kreg32(dd, dd->ipath_kregs->kr_scratch);
+	rmb();
 }
 
 static void scl_out(struct ipath_devdata *dd, u8 bit)
-
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