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scsi_dh_alua: update all port states 

When we read in the target port group state we should be
updating all affected port groups, otherwise we risk
running out of sync.

Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2016-02-19 09:17:14 +01:00 committed by Martin K. Petersen
parent 2b35865e7a
commit c57168a1e1
1 changed files with 25 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/scsi/device_handler/scsi_dh_alua.c
View File

@ -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) {
k += off, desc += off) {
u16 group_id = get_unaligned_be16(&desc[2]);
if (pg->group_id == get_unaligned_be16(&ucp[2])) {
pg->state = ucp[0] & 0x0f;
pg->pref = ucp[0] >> 7;
valid_states = ucp[1];
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;
}