scsi: qla2xxx: Delay I/O Abort on PCI error

Currently when PCI error is detected, I/O is aborted manually through the
ABORT IOCB mechanism which is not guaranteed to succeed.

Instead, wait for the OS or system to notify driver to wind down I/O
through the pci_error_handlers api.  Set eeh_busy flag to pause all traffic
and wait for I/O to drain.

Cc: [email protected]
Signed-off-by: Quinn Tran <[email protected]>
Signed-off-by: Nilesh Javali <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Himanshu Madhani <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Quinn Tran

drivers/scsi/qla2xxx/qla_attr.c

@@ -2741,7 +2741,13 @@ qla2x00_dev_loss_tmo_callbk(struct fc_rport *rport)
 		return;
 
 	if (unlikely(pci_channel_offline(fcport->vha->hw->pdev))) {
-		qla2x00_abort_all_cmds(fcport->vha, DID_NO_CONNECT << 16);
+		/* Will wait for wind down of adapter */
+		ql_dbg(ql_dbg_aer, fcport->vha, 0x900c,
+		    "%s pci offline detected (id %06x)\n", __func__,
+		    fcport->d_id.b24);
+		qla_pci_set_eeh_busy(fcport->vha);
+		qla2x00_eh_wait_for_pending_commands(fcport->vha, fcport->d_id.b24,
+		    0, WAIT_TARGET);
 		return;
 	}
 }
@@ -2763,7 +2769,11 @@ qla2x00_terminate_rport_io(struct fc_rport *rport)
 	vha = fcport->vha;
 
 	if (unlikely(pci_channel_offline(fcport->vha->hw->pdev))) {
-		qla2x00_abort_all_cmds(fcport->vha, DID_NO_CONNECT << 16);
+		/* Will wait for wind down of adapter */
+		ql_dbg(ql_dbg_aer, fcport->vha, 0x900b,
+		    "%s pci offline detected (id %06x)\n", __func__,
+		    fcport->d_id.b24);
+		qla_pci_set_eeh_busy(vha);
 		qla2x00_eh_wait_for_pending_commands(fcport->vha, fcport->d_id.b24,
 			0, WAIT_TARGET);
 		return;