scsi: qedf: fixup bit operations

test_bit() is atomic, test_bit() || test_bit() is not. So protect
consecutive bit tests with a lock to avoid races.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2019-03-26 00:38:45 -07:00 коммит произвёл Martin K. Petersen
Родитель 6d1368e8f9
Коммит 78a8ab3cc0
2 изменённых файлов: 8 добавлений и 1 удалений

Просмотреть файл

@ -358,20 +358,24 @@ void qedf_restart_rport(struct qedf_rport *fcport)
struct fc_lport *lport;
struct fc_rport_priv *rdata;
u32 port_id;
unsigned long flags;
if (!fcport)
return;
spin_lock_irqsave(&fcport->rport_lock, flags);
if (test_bit(QEDF_RPORT_IN_RESET, &fcport->flags) ||
!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
QEDF_ERR(&(fcport->qedf->dbg_ctx), "fcport %p already in reset or not offloaded.\n",
fcport);
spin_unlock_irqrestore(&fcport->rport_lock, flags);
return;
}
/* Set that we are now in reset */
set_bit(QEDF_RPORT_IN_RESET, &fcport->flags);
spin_unlock_irqrestore(&fcport->rport_lock, flags);
rdata = fcport->rdata;
if (rdata) {

Просмотреть файл

@ -1435,12 +1435,14 @@ static void qedf_rport_event_handler(struct fc_lport *lport,
*/
fcport = (struct qedf_rport *)&rp[1];
spin_lock_irqsave(&fcport->rport_lock, flags);
/* Only free this fcport if it is offloaded already */
if (test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) &&
!test_bit(QEDF_RPORT_UPLOADING_CONNECTION,
&fcport->flags)) {
set_bit(QEDF_RPORT_UPLOADING_CONNECTION,
&fcport->flags);
spin_unlock_irqrestore(&fcport->rport_lock, flags);
qedf_cleanup_fcport(qedf, fcport);
/*
* Remove fcport to list of qedf_ctx list of offloaded
@ -1453,8 +1455,9 @@ static void qedf_rport_event_handler(struct fc_lport *lport,
clear_bit(QEDF_RPORT_UPLOADING_CONNECTION,
&fcport->flags);
atomic_dec(&qedf->num_offloads);
} else {
spin_unlock_irqrestore(&fcport->rport_lock, flags);
}
break;
case RPORT_EV_NONE: