qlcnic: Flush mailbox command list when mailbox is not available

o Driver was hitting a panic at the time of adapter reset due to invalid command
  access from the list which had been already freed by the queuing thread.
  Flush all the pending commands from the list before proceeding with adapter reset

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
index 55a597799cf8785b922a4c2d1fe34a4e563d368b..43b51a0ebb45e1ea6a5c5e14142a3910621ed0cf 100644 (file)
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
@@ -3515,6 +3515,8 @@ static inline void qlcnic_83xx_flush_mbx_queue(struct qlcnic_adapter *adapter)
 
        while (!list_empty(head)) {
                cmd = list_entry(head->next, struct qlcnic_cmd_args, list);
+               dev_info(&adapter->pdev->dev, "%s: Mailbox command 0x%x\n",
+                        __func__, cmd->cmd_op);
                list_del(&cmd->list);
                mbx->num_cmds--;
                qlcnic_83xx_notify_cmd_completion(adapter, cmd);
@@ -3534,6 +3536,7 @@ static inline int qlcnic_83xx_check_mbx_status(struct qlcnic_adapter *adapter)
 
        host_mbx_ctrl = QLCRDX(ahw, QLCNIC_HOST_MBX_CTRL);
        if (host_mbx_ctrl) {
+               clear_bit(QLC_83XX_MBX_READY, &mbx->status);
                ahw->idc.collect_dump = 1;
                return -EIO;
        }
@@ -3704,8 +3707,10 @@ static void qlcnic_83xx_mailbox_worker(struct work_struct *work)
        ahw = adapter->ahw;
 
        while (true) {
-               if (qlcnic_83xx_check_mbx_status(adapter))
+               if (qlcnic_83xx_check_mbx_status(adapter)) {
+                       qlcnic_83xx_flush_mbx_queue(adapter);
                        return;
+               }
 
                atomic_set(rsp_status, QLC_83XX_MBX_RESPONSE_WAIT);