diff options
| author | Joern Engel <joern@logfs.org> | 2014-10-03 14:35:56 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 08:59:56 -0800 |
| commit | 35b6bae1a0958e22a8d8feddd9512934f2503f4c (patch) | |
| tree | eae6c39402c9f6dad66471634bd0c5fcbf838805 /drivers/scsi | |
| parent | 8f8ebc589e951f66cc2565529598839458ae4b13 (diff) | |
| download | lwn-35b6bae1a0958e22a8d8feddd9512934f2503f4c.tar.gz lwn-35b6bae1a0958e22a8d8feddd9512934f2503f4c.zip | |
qla_target: don't delete changed nacls
commit f4c24db1b7ad0ce84409e15744d26c6f86a96840 upstream.
The code is currently riddled with "drop the hardware_lock to avoid a
deadlock" bugs that expose races. One of those races seems to expose a
valid warning in tcm_qla2xxx_clear_nacl_from_fcport_map. Add some
bandaid to it.
Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/qla2xxx/tcm_qla2xxx.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c index 788c4fe2b0c9..9d81f7693f99 100644 --- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c +++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c @@ -707,7 +707,16 @@ static void tcm_qla2xxx_clear_nacl_from_fcport_map(struct qla_tgt_sess *sess) pr_debug("fc_rport domain: port_id 0x%06x\n", nacl->nport_id); node = btree_remove32(&lport->lport_fcport_map, nacl->nport_id); - WARN_ON(node && (node != se_nacl)); + if (WARN_ON(node && (node != se_nacl))) { + /* + * The nacl no longer matches what we think it should be. + * Most likely a new dynamic acl has been added while + * someone dropped the hardware lock. It clearly is a + * bug elsewhere, but this bit can't make things worse. + */ + btree_insert32(&lport->lport_fcport_map, nacl->nport_id, + node, GFP_ATOMIC); + } pr_debug("Removed from fcport_map: %p for WWNN: 0x%016LX, port_id: 0x%06x\n", se_nacl, nacl->nport_wwnn, nacl->nport_id); |