benet: Wait f/w POST until timeout

While PCI card faces EEH errors, reset (usually hot reset) is
expected to recover from the EEH errors. After EEH core finishes
the reset, the driver callback (be_eeh_reset) is called and wait
the firmware to complete POST successfully. The original code would
return with error once detecting failure during POST stage. That
seems not enough.

The patch forces the driver (be_eeh_reset) to wait the firmware
completes POST until timeout, instead of returning error upon
detection POST failure immediately. Also, it would improve the
reliability of the EEH funtionality of the driver.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Acked-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.c b/drivers/net/ethernet/emulex/benet/be_cmds.c
index 071aea79d218f01eb166d910a310ef0f49efa470..813407f66c7c8dd579588c9afdab2b5d1a28d3a7 100644 (file)
--- a/drivers/net/ethernet/emulex/benet/be_cmds.c
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.c
@@ -473,7 +473,7 @@ static int be_mbox_notify_wait(struct be_adapter *adapter)
        return 0;
 }
 
-static int be_POST_stage_get(struct be_adapter *adapter, u16 *stage)
+static void be_POST_stage_get(struct be_adapter *adapter, u16 *stage)
 {
        u32 sem;
        u32 reg = skyhawk_chip(adapter) ? SLIPORT_SEMAPHORE_OFFSET_SH :
@@ -481,11 +481,6 @@ static int be_POST_stage_get(struct be_adapter *adapter, u16 *stage)
 
        pci_read_config_dword(adapter->pdev, reg, &sem);
        *stage = sem & POST_STAGE_MASK;
-
-       if ((sem >> POST_ERR_SHIFT) & POST_ERR_MASK)
-               return -1;
-       else
-               return 0;
 }
 
 int lancer_wait_ready(struct be_adapter *adapter)
@@ -579,19 +574,17 @@ int be_fw_wait_ready(struct be_adapter *adapter)
        }
 
        do {
-               status = be_POST_stage_get(adapter, &stage);
-               if (status) {
-                       dev_err(dev, "POST error; stage=0x%x\n", stage);
-                       return -1;
-               } else if (stage != POST_STAGE_ARMFW_RDY) {
-                       if (msleep_interruptible(2000)) {
-                               dev_err(dev, "Waiting for POST aborted\n");
-                               return -EINTR;
-                       }
-                       timeout += 2;
-               } else {
+               be_POST_stage_get(adapter, &stage);
+               if (stage == POST_STAGE_ARMFW_RDY)
                        return 0;
+
+               dev_info(dev, "Waiting for POST, %ds elapsed\n",
+                        timeout);
+               if (msleep_interruptible(2000)) {
+                       dev_err(dev, "Waiting for POST aborted\n");
+                       return -EINTR;
                }
+               timeout += 2;
        } while (timeout < 60);
 
        dev_err(dev, "POST timeout; stage=0x%x\n", stage);