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authorBrian King <brking@linux.vnet.ibm.com>2010-08-05 16:38:31 -0500
committerJames Bottomley <James.Bottomley@suse.de>2010-08-06 12:26:33 -0500
commitd5da3040d798df4bbb62579b97f8b6b83749da22 (patch)
tree96efaf510657b9be678a9a31c807988ca7ae3cdd /drivers/scsi
parent161155519c27773b8f35ee3d7a1b49acfc9eee73 (diff)
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[SCSI] ibmvfc: Fix rport add/delete race resulting in oops
Commit 43c8da907ccc656935d1085701f4db83385d8a59 introduced a race condition which can occur when adding/deleting rports. There are two possible threads now that can be deleting rports in the ibmvfc driver, which can result in list_del being called twice, resulting in an oops. This patch adds a new state to the ibmvfc_target struct to indicate the target has been removed from the list and is in the process of being deleted. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.c8
-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.h1
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index bd96cec..a13db59 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -433,6 +433,9 @@ static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
{
switch (tgt->action) {
case IBMVFC_TGT_ACTION_DEL_RPORT:
+ if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
+ tgt->action = action;
+ case IBMVFC_TGT_ACTION_DELETED_RPORT:
break;
default:
if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
@@ -4193,11 +4196,15 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
tgt_dbg(tgt, "Deleting rport\n");
list_del(&tgt->queue);
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
fc_remote_port_delete(rport);
del_timer_sync(&tgt->timer);
kref_put(&tgt->kref, ibmvfc_release_tgt);
return;
+ } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
+ spin_unlock_irqrestore(vhost->host->host_lock, flags);
+ return;
}
if (rport) {
@@ -4297,6 +4304,7 @@ static void ibmvfc_do_work(struct ibmvfc_host *vhost)
rport = tgt->rport;
tgt->rport = NULL;
list_del(&tgt->queue);
+ ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rport)
fc_remote_port_delete(rport);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index d7e8dcd..af48172 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -597,6 +597,7 @@ enum ibmvfc_target_action {
IBMVFC_TGT_ACTION_INIT,
IBMVFC_TGT_ACTION_INIT_WAIT,
IBMVFC_TGT_ACTION_DEL_RPORT,
+ IBMVFC_TGT_ACTION_DELETED_RPORT,
};
struct ibmvfc_target {