diff options
Diffstat (limited to 'drivers/scsi/device_handler')
| -rw-r--r-- | drivers/scsi/device_handler/scsi_dh_alua.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c index ef5d6c3a97bd..98d87d9765ab 100644 --- a/drivers/scsi/device_handler/scsi_dh_alua.c +++ b/drivers/scsi/device_handler/scsi_dh_alua.c @@ -476,11 +476,13 @@ static int alua_check_sense(struct scsi_device *sdev, static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg) { struct scsi_sense_hdr sense_hdr; + struct alua_port_group *tmp_pg; int len, k, off, valid_states = 0, bufflen = ALUA_RTPG_SIZE; - unsigned char *ucp, *buff; + unsigned char *desc, *buff; unsigned err, retval; unsigned int tpg_desc_tbl_off; unsigned char orig_transition_tmo; + unsigned long flags; if (!pg->expiry) { unsigned long transition_tmo = ALUA_FAILOVER_TIMEOUT * HZ; @@ -582,18 +584,32 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg) else tpg_desc_tbl_off = 4; - for (k = tpg_desc_tbl_off, ucp = buff + tpg_desc_tbl_off; + for (k = tpg_desc_tbl_off, desc = buff + tpg_desc_tbl_off; k < len; - k += off, ucp += off) { - - if (pg->group_id == get_unaligned_be16(&ucp[2])) { - pg->state = ucp[0] & 0x0f; - pg->pref = ucp[0] >> 7; - valid_states = ucp[1]; + k += off, desc += off) { + u16 group_id = get_unaligned_be16(&desc[2]); + + spin_lock_irqsave(&port_group_lock, flags); + tmp_pg = alua_find_get_pg(pg->device_id_str, pg->device_id_len, + group_id); + spin_unlock_irqrestore(&port_group_lock, flags); + if (tmp_pg) { + if (spin_trylock_irqsave(&tmp_pg->lock, flags)) { + if ((tmp_pg == pg) || + !(tmp_pg->flags & ALUA_PG_RUNNING)) { + tmp_pg->state = desc[0] & 0x0f; + tmp_pg->pref = desc[0] >> 7; + } + if (tmp_pg == pg) + valid_states = desc[1]; + spin_unlock_irqrestore(&tmp_pg->lock, flags); + } + kref_put(&tmp_pg->kref, release_port_group); } - off = 8 + (ucp[7] * 4); + off = 8 + (desc[7] * 4); } + spin_lock_irqsave(&pg->lock, flags); sdev_printk(KERN_INFO, sdev, "%s: port group %02x state %c %s supports %c%c%c%c%c%c%c\n", ALUA_DH_NAME, pg->group_id, print_alua_state(pg->state), @@ -630,6 +646,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg) pg->expiry = 0; break; } + spin_unlock_irqrestore(&pg->lock, flags); kfree(buff); return err; } |