e1000e: Check the PCIm state

Complete to commit def4ec6dce393e ("e1000e: PCIm function state support")
Check the PCIm state only on CSME systems. There is no point to do this
check on non CSME systems.
This patch fixes a generation a false-positive warning:
"Error in exiting dmoff"

Fixes: def4ec6dce39 ("e1000e: PCIm function state support")
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 88e9035..dc0ded7 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -5223,18 +5223,20 @@ static void e1000_watchdog_task(struct work_struct *work)
                        pm_runtime_resume(netdev->dev.parent);
 
                        /* Checking if MAC is in DMoff state*/
-                       pcim_state = er32(STATUS);
-                       while (pcim_state & E1000_STATUS_PCIM_STATE) {
-                               if (tries++ == dmoff_exit_timeout) {
-                                       e_dbg("Error in exiting dmoff\n");
-                                       break;
-                               }
-                               usleep_range(10000, 20000);
+                       if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID) {
                                pcim_state = er32(STATUS);
-
-                               /* Checking if MAC exited DMoff state */
-                               if (!(pcim_state & E1000_STATUS_PCIM_STATE))
-                                       e1000_phy_hw_reset(&adapter->hw);
+                               while (pcim_state & E1000_STATUS_PCIM_STATE) {
+                                       if (tries++ == dmoff_exit_timeout) {
+                                               e_dbg("Error in exiting dmoff\n");
+                                               break;
+                                       }
+                                       usleep_range(10000, 20000);
+                                       pcim_state = er32(STATUS);
+
+                                       /* Checking if MAC exited DMoff state */
+                                       if (!(pcim_state & E1000_STATUS_PCIM_STATE))
+                                               e1000_phy_hw_reset(&adapter->hw);
+                               }
                        }
 
                        /* update snapshot of PHY registers on LSC */