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scsi: qla2xxx: Wait for io return on terminate rport

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System crash due to use after free.
Current code allows terminate_rport_io to exit before making
sure all IOs has returned. For FCP-2 device, IO's can hang
on in HW because driver has not tear down the session in FW at
first sign of cable pull. When dev_loss_tmo timer pops,
terminate_rport_io is called and upper layer is about to
free various resources. Terminate_rport_io trigger qla to do
the final cleanup, but the cleanup might not be fast enough where it
leave qla still holding on to the same resource.

Wait for IO's to return to upper layer before resources are freed.

Cc: stable@vger.kernel.org
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://lore.kernel.org/r/20230428075339.32551-7-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran 2023-04-28 00:53:38 -07:00 committed by Martin K. Petersen
parent b843adde8d
commit fc0cba0c7b
1 changed files with 13 additions and 0 deletions
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13
drivers/scsi/qla2xxx/qla_attr.c
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@ -2750,6 +2750,7 @@ static void
qla2x00_terminate_rport_io(struct fc_rport *rport)
{
fc_port_t *fcport = *(fc_port_t **)rport->dd_data;
scsi_qla_host_t *vha;
if (!fcport)
return;
@ -2759,9 +2760,12 @@ qla2x00_terminate_rport_io(struct fc_rport *rport)
if (test_bit(ABORT_ISP_ACTIVE, &fcport->vha->dpc_flags))
return;
vha = fcport->vha;
if (unlikely(pci_channel_offline(fcport->vha->hw->pdev))) {
qla2x00_abort_all_cmds(fcport->vha, DID_NO_CONNECT << 16);
qla2x00_eh_wait_for_pending_commands(fcport->vha, fcport->d_id.b24,
0, WAIT_TARGET);
return;
}
/*
@ -2786,6 +2790,15 @@ qla2x00_terminate_rport_io(struct fc_rport *rport)
qla2x00_port_logout(fcport->vha, fcport);
}
}
/* check for any straggling io left behind */
if (qla2x00_eh_wait_for_pending_commands(fcport->vha, fcport->d_id.b24, 0, WAIT_TARGET)) {
ql_log(ql_log_warn, vha, 0x300b,
"IO not return. Resetting. \n");
set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
qla2xxx_wake_dpc(vha);
qla2x00_wait_for_chip_reset(vha);
}
}
static int