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scsi: qla2xxx: Fix deletion race condition 

System crash when using debug kernel due to link list corruption. The cause
of the link list corruption is due to session deletion was allowed to queue
up twice.  Here's the internal trace that show the same port was allowed to
double queue for deletion on different cpu.

20808683956 015 qla2xxx [0000:13:00.1]-e801:4: Scheduling sess ffff93ebf9306800 for deletion 50:06:0e:80:12:48:ff:50 fc4_type 1
20808683957 027 qla2xxx [0000:13:00.1]-e801:4: Scheduling sess ffff93ebf9306800 for deletion 50:06:0e:80:12:48:ff:50 fc4_type 1

Move the clearing/setting of deleted flag lock.

Cc: stable@vger.kernel.org
Fixes: 726b854870 ("qla2xxx: Add framework for async fabric discovery")
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://lore.kernel.org/r/20230714070104.40052-2-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 2023-07-14 12:30:55 +05:30 committed by Martin K. Petersen
parent 06c2afb862
commit 6dfe4344c1
2 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/scsi/qla2xxx/qla_init.c
View File

@ -508,6 +508,7 @@ static
void qla24xx_handle_adisc_event(scsi_qla_host_t *vha, struct event_arg *ea)
{
struct fc_port *fcport = ea->fcport;
unsigned long flags;
ql_dbg(ql_dbg_disc, vha, 0x20d2,
"%s %8phC DS %d LS %d rc %d login %d|%d rscn %d|%d lid %d\n",
@ -522,9 +523,15 @@ void qla24xx_handle_adisc_event(scsi_qla_host_t *vha, struct event_arg *ea)
ql_dbg(ql_dbg_disc, vha, 0x2066,
"%s %8phC: adisc fail: post delete\n",
__func__, ea->fcport->port_name);
spin_lock_irqsave(&vha->work_lock, flags);
/* deleted = 0 & logout_on_delete = force fw cleanup */
fcport->deleted = 0;
if (fcport->deleted == QLA_SESS_DELETED)
fcport->deleted = 0;
fcport->logout_on_delete = 1;
spin_unlock_irqrestore(&vha->work_lock, flags);
qlt_schedule_sess_for_deletion(ea->fcport);
return;
}
@ -1446,7 +1453,6 @@ void __qla24xx_handle_gpdb_event(scsi_qla_host_t *vha, struct event_arg *ea)
spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
ea->fcport->login_gen++;
ea->fcport->deleted = 0;
ea->fcport->logout_on_delete = 1;
if (!ea->fcport->login_succ && !IS_SW_RESV_ADDR(ea->fcport->d_id)) {
@ -6090,6 +6096,8 @@ qla2x00_reg_remote_port(scsi_qla_host_t *vha, fc_port_t *fcport)
void
qla2x00_update_fcport(scsi_qla_host_t *vha, fc_port_t *fcport)
{
unsigned long flags;
if (IS_SW_RESV_ADDR(fcport->d_id))
return;
@ -6099,7 +6107,11 @@ qla2x00_update_fcport(scsi_qla_host_t *vha, fc_port_t *fcport)
qla2x00_set_fcport_disc_state(fcport, DSC_UPD_FCPORT);
fcport->login_retry = vha->hw->login_retry_count;
fcport->flags &= ~(FCF_LOGIN_NEEDED | FCF_ASYNC_SENT);
spin_lock_irqsave(&vha->work_lock, flags);
fcport->deleted = 0;
spin_unlock_irqrestore(&vha->work_lock, flags);
if (vha->hw->current_topology == ISP_CFG_NL)
fcport->logout_on_delete = 0;
else

14
drivers/scsi/qla2xxx/qla_target.c
View File

@ -1068,10 +1068,6 @@ void qlt_free_session_done(struct work_struct *work)
(struct imm_ntfy_from_isp *)sess->iocb, SRB_NACK_LOGO);
}
spin_lock_irqsave(&vha->work_lock, flags);
sess->flags &= ~FCF_ASYNC_SENT;
spin_unlock_irqrestore(&vha->work_lock, flags);
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
if (sess->se_sess) {
sess->se_sess = NULL;
@ -1081,7 +1077,6 @@ void qlt_free_session_done(struct work_struct *work)
qla2x00_set_fcport_disc_state(sess, DSC_DELETED);
sess->fw_login_state = DSC_LS_PORT_UNAVAIL;
sess->deleted = QLA_SESS_DELETED;
if (sess->login_succ && !IS_SW_RESV_ADDR(sess->d_id)) {
vha->fcport_count--;
@ -1133,10 +1128,15 @@ void qlt_free_session_done(struct work_struct *work)
sess->explicit_logout = 0;
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
sess->free_pending = 0;
qla2x00_dfs_remove_rport(vha, sess);
spin_lock_irqsave(&vha->work_lock, flags);
sess->flags &= ~FCF_ASYNC_SENT;
sess->deleted = QLA_SESS_DELETED;
sess->free_pending = 0;
spin_unlock_irqrestore(&vha->work_lock, flags);
ql_dbg(ql_dbg_disc, vha, 0xf001,
"Unregistration of sess %p %8phC finished fcp_cnt %d\n",
sess, sess->port_name, vha->fcport_count);
@ -1185,12 +1185,12 @@ void qlt_unreg_sess(struct fc_port *sess)
* management from being sent.
*/
sess->flags |= FCF_ASYNC_SENT;
sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
spin_unlock_irqrestore(&sess->vha->work_lock, flags);
if (sess->se_sess)
vha->hw->tgt.tgt_ops->clear_nacl_from_fcport_map(sess);
sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
qla2x00_set_fcport_disc_state(sess, DSC_DELETE_PEND);
sess->last_rscn_gen = sess->rscn_gen;
sess->last_login_gen = sess->login_gen;