e1000e: fix double release of mutex

During a reset, releasing the swflag after it failed to be acquired would
cause a double unlock of the mutex.  Instead, test whether acquisition of
the swflag was successful and if not, do not release the swflag.  The reset
must still be done to bring the device to a quiescent state.

This resolves [BUG 12200] BUG: bad unlock balance detected! e1000e
http://bugzilla.kernel.org/show_bug.cgi?id=12200

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 523b9716a543aec21d923b58a07cd5162b3edab3..d115a6d30f29c0b3acb81c8038c6215993980e8d 100644 (file)
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -1893,12 +1893,17 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
                ctrl |= E1000_CTRL_PHY_RST;
        }
        ret_val = e1000_acquire_swflag_ich8lan(hw);
+       /* Whether or not the swflag was acquired, we need to reset the part */
        hw_dbg(hw, "Issuing a global reset to ich8lan");
        ew32(CTRL, (ctrl | E1000_CTRL_RST));
        msleep(20);
 
-       /* release the swflag because it is not reset by hardware reset */
-       e1000_release_swflag_ich8lan(hw);
+       if (!ret_val) {
+               /* release the swflag because it is not reset by
+                * hardware reset
+                */
+               e1000_release_swflag_ich8lan(hw);
+       }
 
        ret_val = e1000e_get_auto_rd_done(hw);
        if (ret_val) {