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scsi: fcoe: hold disc_mutex when traversing rport lists 

When calling either fc_rport_logon() or fc_rport_logoff() during rport list
traversal we cannot use the RCU list traversal, as either of these
functions will be taking a mutex.  So we need to partially revert commit
a407c59339 to take the disc mutex during traversal.  We should, however,
continue to use krefs to ensure that the rport object will not be freed
from under us.

Fixes: a407c59339 ("scsi: libfc: Fixup disc_mutex handling")
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2018-07-11 10:09:30 +02:00 committed by Martin K. Petersen
parent bbc0f8bd88
commit 0993ed922a
1 changed files with 4 additions and 8 deletions
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12
drivers/scsi/fcoe/fcoe_ctlr.c
View File

@ -2175,15 +2175,13 @@ static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
{
struct fc_rport_priv *rdata;
rcu_read_lock();
mutex_lock(&lport->disc.disc_mutex);
list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
if (kref_get_unless_zero(&rdata->kref)) {
fc_rport_logoff(rdata);
kref_put(&rdata->kref, fc_rport_destroy);
}
}
rcu_read_unlock();
mutex_lock(&lport->disc.disc_mutex);
lport->disc.disc_callback = NULL;
mutex_unlock(&lport->disc.disc_mutex);
}
@ -2712,7 +2710,7 @@ static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
unsigned long deadline;
next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
rcu_read_lock();
mutex_lock(&lport->disc.disc_mutex);
list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
if (!kref_get_unless_zero(&rdata->kref))
continue;
@ -2733,7 +2731,7 @@ static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
next_time = deadline;
kref_put(&rdata->kref, fc_rport_destroy);
}
rcu_read_unlock();
mutex_unlock(&lport->disc.disc_mutex);
return next_time;
}
@ -3080,8 +3078,6 @@ static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
mutex_lock(&disc->disc_mutex);
callback = disc->pending ? disc->disc_callback : NULL;
disc->pending = 0;
mutex_unlock(&disc->disc_mutex);
rcu_read_lock();
list_for_each_entry_rcu(rdata, &disc->rports, peers) {
if (!kref_get_unless_zero(&rdata->kref))
continue;
@ -3090,7 +3086,7 @@ static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
fc_rport_login(rdata);
kref_put(&rdata->kref, fc_rport_destroy);
}
rcu_read_unlock();
mutex_unlock(&disc->disc_mutex);
if (callback)
callback(lport, DISC_EV_SUCCESS);
}