[SCSI] qla4xxx: Handle outstanding mbx cmds on hung f/w scenarios

Outstanding mailbox commands, have no way to recover on f/w hung, and we
timeout on waiting for mbx response. This in turn affects the recovery process
as follows:
 - We might already be in dpc while waiting for mbx to complete, so recovery for
   that pci function will never get invoked. Reset Timeout (10 sec) is far less
   than mbx timeout (30 sec).
 - Other mbx cmds will get stuck due to serial mbx access.

Solution is to identify fw-hung scenario and handle outstanding mbx commands to
have an early-exit instead of waiting for response.
Other mbx commands waiting for access will also do an early-exit if fw-hung is
still applicable.

Signed-off-by: Nilesh Javali <nilesh.javali@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index c4e036b449c..1003e48d220 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -39,6 +39,15 @@ int qla4xxx_mailbox_command(struct scsi_qla_host *ha, uint8_t inCount,
 			      "pointer\n", ha->host_no, __func__));
 		return status;
 	}
+
+	if (is_qla8022(ha) &&
+	    test_bit(AF_FW_RECOVERY, &ha->flags)) {
+		DEBUG2(ql4_printk(KERN_WARNING, ha, "scsi%ld: %s: prematurely "
+		    "completing mbx cmd as firmware recovery detected\n",
+		    ha->host_no, __func__));
+		return status;
+	}
+
 	/* Mailbox code active */
 	wait_count = MBOX_TOV * 100;
 
@@ -196,6 +205,14 @@ int qla4xxx_mailbox_command(struct scsi_qla_host *ha, uint8_t inCount,
 
 	/* Check for mailbox timeout. */
 	if (!test_bit(AF_MBOX_COMMAND_DONE, &ha->flags)) {
+		if (is_qla8022(ha) &&
+		    test_bit(AF_FW_RECOVERY, &ha->flags)) {
+			DEBUG2(ql4_printk(KERN_INFO, ha,
+			    "scsi%ld: %s: prematurely completing mbx cmd as "
+			    "firmware recovery detected\n",
+			    ha->host_no, __func__));
+			goto mbox_exit;
+		}
 		DEBUG2(printk("scsi%ld: Mailbox Cmd 0x%08X timed out ...,"
 			      " Scheduling Adapter Reset\n", ha->host_no,
 			      mbx_cmd[0]));
@@ -246,6 +263,28 @@ mbox_exit:
 	return status;
 }
 
+void qla4xxx_mailbox_premature_completion(struct scsi_qla_host *ha)
+{
+	set_bit(AF_FW_RECOVERY, &ha->flags);
+	ql4_printk(KERN_INFO, ha, "scsi%ld: %s: set FW RECOVERY!\n",
+	    ha->host_no, __func__);
+
+	if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
+		if (test_bit(AF_MBOX_COMMAND_NOPOLL, &ha->flags)) {
+			complete(&ha->mbx_intr_comp);
+			ql4_printk(KERN_INFO, ha, "scsi%ld: %s: Due to fw "
+			    "recovery, doing premature completion of "
+			    "mbx cmd\n", ha->host_no, __func__);
+
+		} else {
+			set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
+			ql4_printk(KERN_INFO, ha, "scsi%ld: %s: Due to fw "
+			    "recovery, doing premature completion of "
+			    "polling mbx cmd\n", ha->host_no, __func__);
+		}
+	}
+}
+
 static uint8_t
 qla4xxx_set_ifcb(struct scsi_qla_host *ha, uint32_t *mbox_cmd,
 		 uint32_t *mbox_sts, dma_addr_t init_fw_cb_dma)