qlcnic: rom lock recovery

Fw can get stuck while holding pci semaphore. Driver will not
be able to perform fw initialization, without this lock.
Release semaphore forcefully in that case.

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlcnic/qlcnic_hw.c

@@ -297,8 +297,8 @@ qlcnic_pcie_sem_lock(struct qlcnic_adapter *adapter, int sem, u32 id_reg)
 			break;
 		if (++timeout >= QLCNIC_PCIE_SEM_TIMEOUT) {
 			dev_err(&adapter->pdev->dev,
-				"Failed to acquire sem=%d lock;reg_id=%d\n",
-				sem, id_reg);
+				"Failed to acquire sem=%d lock; holdby=%d\n",
+				sem, id_reg ? QLCRD32(adapter, id_reg) : -1);
 			return -EIO;
 		}
 		msleep(1);

drivers/net/qlcnic/qlcnic_init.c

@@ -928,15 +928,25 @@ qlcnic_get_bios_version(struct qlcnic_adapter *adapter)
 	return (bios_ver << 16) + ((bios_ver >> 8) & 0xff00) + (bios_ver >> 24);
 }
 
+static void qlcnic_rom_lock_recovery(struct qlcnic_adapter *adapter)
+{
+	if (qlcnic_pcie_sem_lock(adapter, 2, QLCNIC_ROM_LOCK_ID))
+		dev_info(&adapter->pdev->dev, "Resetting rom_lock\n");
+
+	qlcnic_pcie_sem_unlock(adapter, 2);
+}
+
 int
 qlcnic_need_fw_reset(struct qlcnic_adapter *adapter)
 {
 	u32 val, version, major, minor, build;
 
-	if (adapter->need_fw_reset)
+	if (qlcnic_check_fw_status(adapter)) {
+		qlcnic_rom_lock_recovery(adapter);
 		return 1;
+	}
 
-	if (qlcnic_check_fw_status(adapter))
+	if (adapter->need_fw_reset)
 		return 1;
 
 	/* check if we have got newer or different file firmware */