diff options
| author | Joern Engel <joern@logfs.org> | 2014-10-04 01:35:56 +0400 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-10-04 01:35:56 +0400 |
| commit | f4c24db1b7ad0ce84409e15744d26c6f86a96840 (patch) | |
| tree | 472122df7a7e6257823d757301cb5bc5667d1f2f | |
| parent | f56574a2b554492703030e3d3b9679c9a07a5d69 (diff) | |
| download | linux-f4c24db1b7ad0ce84409e15744d26c6f86a96840.tar.xz | |
qla_target: don't delete changed nacls
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>
Cc: <stable@vger.kernel.org> # v3.5+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -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 e2beab962096..4747d2c66024 100644 --- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c +++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c @@ -757,7 +757,16 @@ 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); |