[openib-general] [PATCH 28 of 39] IB/ipath - Fixes a bug where our delay for EEPROM no longer works due to compiler reordering

[Bryan O'Sullivan]

The mb() prevents the compiler from reordering on this function, with some versions
of gcc and -Os optimization.   The result is random failures in the EEPROM read
without this change.


Signed-off-by: Dave Olson <dave.olson at qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan at qlogic.com>

diff -r 7d22a8963bda -r 5f3c0b2d446d drivers/infiniband/hw/ipath/ipath_eeprom.c
--- a/drivers/infiniband/hw/ipath/ipath_eeprom.c	Thu Jun 29 14:33:26 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_eeprom.c	Thu Jun 29 14:33:26 2006 -0700
@@ -186,6 +186,7 @@ bail:
  */
 static void i2c_wait_for_writes(struct ipath_devdata *dd)
 {
+	mb();
 	(void)ipath_read_kreg32(dd, dd->ipath_kregs->kr_scratch);
 }