e1000e: Release mutex lock only if it has been initially acquired

This patch fixes the issue of unlocking swflag_mutex for 82574 and 82583
devices regardless of if the hw semaphore has been successfully acquired via
e1000_get_hw_semaphore_82574(). With this patch, unlocking mutex now depends
on if the hw semaphore was successfully acquired before. And 82574/82583
devices are reset regardless of whether e1000_get_hw_semaphore_82574()
returns success or failure.

Reported-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/e1000e/82571.c b/drivers/net/ethernet/intel/e1000e/82571.c
index bef2f10..4c303e2 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/82571.c
+++ b/drivers/net/ethernet/intel/e1000e/82571.c
@@ -1003,8 +1003,6 @@ static s32 e1000_reset_hw_82571(struct e1000_hw *hw)
        default:
                break;
        }
-       if (ret_val)
-               e_dbg("Cannot acquire MDIO ownership\n");
 
        ctrl = er32(CTRL);
 
@@ -1015,7 +1013,9 @@ static s32 e1000_reset_hw_82571(struct e1000_hw *hw)
        switch (hw->mac.type) {
        case e1000_82574:
        case e1000_82583:
-               e1000_put_hw_semaphore_82574(hw);
+               /* Release mutex only if the hw semaphore is acquired */
+               if (!ret_val)
+                       e1000_put_hw_semaphore_82574(hw);
                break;
        default:
                break;