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scsi: scsi_dh_alua: Prevent duplicate pg info print in alua_rtpg()

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Due to the frequency that alua_rtpg() is called, the path group info print
within can print the same info multiple times in the logs, subsequent
prints adding no new information or value.

To reproduce:

    # modprobe scsi_debug vpd_use_hostno=0
    # systemctl start multipathd.service

To fix, check stored values, only printing at alua attach/activate and if
any of the values change.

Link: https://lore.kernel.org/r/20210331181656.5046-1-jpittman@redhat.com
Reviewed-by: David Jeffery <djeffery@redhat.com>
Reviewed-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: John Pittman <jpittman@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Pittman 2021-03-31 14:16:56 -04:00 committed by Martin K. Petersen
parent d56030f882
commit 22ec513e70
1 changed files with 19 additions and 11 deletions
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30
drivers/scsi/device_handler/scsi_dh_alua.c
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@ -515,6 +515,7 @@ 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, bufflen = ALUA_RTPG_SIZE;
int group_id_old, state_old, pref_old, valid_states_old;
unsigned char *desc, *buff;
unsigned err, retval;
unsigned int tpg_desc_tbl_off;
@ -522,6 +523,11 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg)
unsigned long flags;
bool transitioning_sense = false;
group_id_old = pg->group_id;
state_old = pg->state;
pref_old = pg->pref;
valid_states_old = pg->valid_states;
if (!pg->expiry) {
unsigned long transition_tmo = ALUA_FAILOVER_TIMEOUT * HZ;
@ -686,17 +692,19 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg)
if (transitioning_sense)
pg->state = SCSI_ACCESS_STATE_TRANSITIONING;
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),
pg->pref ? "preferred" : "non-preferred",
pg->valid_states&TPGS_SUPPORT_TRANSITION?'T':'t',
pg->valid_states&TPGS_SUPPORT_OFFLINE?'O':'o',
pg->valid_states&TPGS_SUPPORT_LBA_DEPENDENT?'L':'l',
pg->valid_states&TPGS_SUPPORT_UNAVAILABLE?'U':'u',
pg->valid_states&TPGS_SUPPORT_STANDBY?'S':'s',
pg->valid_states&TPGS_SUPPORT_NONOPTIMIZED?'N':'n',
pg->valid_states&TPGS_SUPPORT_OPTIMIZED?'A':'a');
if (group_id_old != pg->group_id || state_old != pg->state ||
pref_old != pg->pref || valid_states_old != pg->valid_states)
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),
pg->pref ? "preferred" : "non-preferred",
pg->valid_states&TPGS_SUPPORT_TRANSITION?'T':'t',
pg->valid_states&TPGS_SUPPORT_OFFLINE?'O':'o',
pg->valid_states&TPGS_SUPPORT_LBA_DEPENDENT?'L':'l',
pg->valid_states&TPGS_SUPPORT_UNAVAILABLE?'U':'u',
pg->valid_states&TPGS_SUPPORT_STANDBY?'S':'s',
pg->valid_states&TPGS_SUPPORT_NONOPTIMIZED?'N':'n',
pg->valid_states&TPGS_SUPPORT_OPTIMIZED?'A':'a');
switch (pg->state) {
case SCSI_ACCESS_STATE_TRANSITIONING: