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igb: Fix lack of flush after register write and before delay

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commit 064b43304e upstream.

Register writes followed by a delay are required to have a flush
before the delay in order to commit the values to the register.  Without
the flush, the code following the delay may not function correctly.

Reported-by: Tong Ho <tong.ho@ericsson.com>
Reported-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by:  Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Carolyn Wyborny
2011-06-25 13:18:12 +00:00
committed by Greg Kroah-Hartman
parent 3a60f9e4a0
commit 80b5405f36
1 changed files with 1 additions and 0 deletions
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1
drivers/net/igb/e1000_82575.c
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@@ -1735,6 +1735,7 @@ static s32 igb_reset_hw_82580(struct e1000_hw *hw)
ctrl |= E1000_CTRL_RST;
wr32(E1000_CTRL, ctrl);
wrfl();
/* Add delay to insure DEV_RST has time to complete */
if (global_device_reset)