mpt3sas: fix for driver fails EEH, recovery from injected pci bus error

This patch stops the driver to invoke kthread (which remove the dead
ioc) for some time while EEH recovery has started.

This patch is a port of commit b4730fb6 ("mpt2sas: fix for driver
fails EEH, recovery from injected pci bus error")'.
Signed-off-by: NSreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Acked-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mpt3sas/mpt3sas_base.c

@@ -157,7 +157,7 @@ _base_fault_reset_work(struct work_struct *work)
 
 
 	spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
-	if (ioc->shost_recovery)
+	if (ioc->shost_recovery || ioc->pci_error_recovery)
 		goto rearm_timer;
 	spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
 
@@ -166,6 +166,20 @@ _base_fault_reset_work(struct work_struct *work)
 		pr_err(MPT3SAS_FMT "SAS host is non-operational !!!!\n",
 		    ioc->name);
 
+		/* It may be possible that EEH recovery can resolve some of
+		 * pci bus failure issues rather removing the dead ioc function
+		 * by considering controller is in a non-operational state. So
+		 * here priority is given to the EEH recovery. If it doesn't
+		 * not resolve this issue, mpt3sas driver will consider this
+		 * controller to non-operational state and remove the dead ioc
+		 * function.
+		 */
+		if (ioc->non_operational_loop++ < 5) {
+			spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock,
+							 flags);
+			goto rearm_timer;
+		}
+
 		/*
 		 * Call _scsih_flush_pending_cmds callback so that we flush all
 		 * pending commands back to OS. This call is required to aovid
@@ -193,6 +207,8 @@ _base_fault_reset_work(struct work_struct *work)
 		return; /* don't rearm timer */
 	}
 
+	ioc->non_operational_loop = 0;
+
 	if ((doorbell & MPI2_IOC_STATE_MASK) != MPI2_IOC_STATE_OPERATIONAL) {
 		rc = mpt3sas_base_hard_reset_handler(ioc, CAN_SLEEP,
 		    FORCE_BIG_HAMMER);
@@ -5162,6 +5178,7 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
 	if (r)
 		goto out_free_resources;
 
+	ioc->non_operational_loop = 0;
 	return 0;
 
  out_free_resources:

drivers/scsi/mpt3sas/mpt3sas_base.h

@@ -845,6 +845,7 @@ struct MPT3SAS_ADAPTER {
 	u16		cpu_msix_table_sz;
 	u32		ioc_reset_count;
 	MPT3SAS_FLUSH_RUNNING_CMDS schedule_dead_ioc_flush_running_cmds;
+	u32             non_operational_loop;
 
 	/* internal commands, callback index */
 	u8		scsi_io_cb_idx;