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Date:	Thu,  9 Jun 2011 20:47:47 -0700
From:	Jeff Kirsher <>
Cc:	Bruce Allan <>,,, Jeff Kirsher <>
Subject: [PATCH 03/12] e1000e: log when swflag is cleared unexpectedly on ICH/PCH devices

From: Bruce Allan <>

Since EXTCNF_CTRL.SWFLAG (used in the ownership arbitration of shared
resources, e.g. the PHY shared between the s/w, f/w, and h/w clients)
can be cleared by any of those clients, log a debug message when
software attempts to clear it and it is already cleared unexpectedly.
And since the swflag is cleared by a hardware reset, the driver does
not need to do that, but the mutex acquired when the bit is set must
still be cleared.

Signed-off-by: Bruce Allan <>
Tested-by: Aaron Brown <>
Signed-off-by: Jeff Kirsher <>
 drivers/net/e1000e/ich8lan.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index dcd5db5..dddd0b3 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -889,8 +889,13 @@ static void e1000_release_swflag_ich8lan(struct e1000_hw *hw)
 	u32 extcnf_ctrl;
 	extcnf_ctrl = er32(EXTCNF_CTRL);
-	extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
-	ew32(EXTCNF_CTRL, extcnf_ctrl);
+	if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG) {
+		extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
+		ew32(EXTCNF_CTRL, extcnf_ctrl);
+	} else {
+		e_dbg("Semaphore unexpectedly released by sw/fw/hw\n");
+	}
@@ -3066,7 +3071,7 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
 	if (!ret_val)
-		e1000_release_swflag_ich8lan(hw);
+		mutex_unlock(&swflag_mutex);
 	if (ctrl & E1000_CTRL_PHY_RST) {
 		ret_val = hw->phy.ops.get_cfg_done(hw);

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