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scsi: scsi_dh_alua: remove synchronous STPG support 

Since 9c58b395 ("scsi: scsi_devinfo: remove synchronous ALUA for NETAPP
devices") this code is unused.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-06-19 14:27:24 +02:00 committed by Martin K. Petersen
parent 496c91bbc9
commit 6934be4f01
2 changed files with 5 additions and 23 deletions
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27
drivers/scsi/device_handler/scsi_dh_alua.c
View File

@ -57,7 +57,6 @@
/* device handler flags */
#define ALUA_OPTIMIZE_STPG 0x01
#define ALUA_RTPG_EXT_HDR_UNSUPP 0x02
#define ALUA_SYNC_STPG 0x04
/* State machine flags */
#define ALUA_PG_RUN_RTPG 0x10
#define ALUA_PG_RUN_STPG 0x20
@ -70,7 +69,6 @@ MODULE_PARM_DESC(optimize_stpg, "Allow use of a non-optimized path, rather than
static LIST_HEAD(port_group_list);
static DEFINE_SPINLOCK(port_group_lock);
static struct workqueue_struct *kaluad_wq;
static struct workqueue_struct *kaluad_sync_wq;
struct alua_port_group {
struct kref kref;
@ -380,8 +378,6 @@ static int alua_check_vpd(struct scsi_device *sdev, struct alua_dh_data *h,
}
spin_lock_irqsave(&pg->lock, flags);
if (sdev->synchronous_alua)
pg->flags |= ALUA_SYNC_STPG;
if (pg_updated)
list_add_rcu(&h->node, &pg->dh_list);
spin_unlock_irqrestore(&pg->lock, flags);
@ -785,7 +781,6 @@ static void alua_rtpg_work(struct work_struct *work)
int err = SCSI_DH_OK;
struct alua_queue_data *qdata, *tmp;
unsigned long flags;
struct workqueue_struct *alua_wq = kaluad_wq;
spin_lock_irqsave(&pg->lock, flags);
sdev = pg->rtpg_sdev;
@ -796,8 +791,6 @@ static void alua_rtpg_work(struct work_struct *work)
kref_put(&pg->kref, release_port_group);
return;
}
if (pg->flags & ALUA_SYNC_STPG)
alua_wq = kaluad_sync_wq;
pg->flags |= ALUA_PG_RUNNING;
if (pg->flags & ALUA_PG_RUN_RTPG) {
int state = pg->state;
@ -810,7 +803,7 @@ static void alua_rtpg_work(struct work_struct *work)
pg->flags &= ~ALUA_PG_RUNNING;
pg->flags |= ALUA_PG_RUN_RTPG;
spin_unlock_irqrestore(&pg->lock, flags);
queue_delayed_work(alua_wq, &pg->rtpg_work,
queue_delayed_work(kaluad_wq, &pg->rtpg_work,
pg->interval * HZ);
return;
}
@ -822,7 +815,7 @@ static void alua_rtpg_work(struct work_struct *work)
pg->flags &= ~ALUA_PG_RUNNING;
pg->flags |= ALUA_PG_RUN_RTPG;
spin_unlock_irqrestore(&pg->lock, flags);
queue_delayed_work(alua_wq, &pg->rtpg_work,
queue_delayed_work(kaluad_wq, &pg->rtpg_work,
pg->interval * HZ);
return;
}
@ -839,7 +832,7 @@ static void alua_rtpg_work(struct work_struct *work)
pg->interval = 0;
pg->flags &= ~ALUA_PG_RUNNING;
spin_unlock_irqrestore(&pg->lock, flags);
queue_delayed_work(alua_wq, &pg->rtpg_work,
queue_delayed_work(kaluad_wq, &pg->rtpg_work,
pg->interval * HZ);
return;
}
@ -874,8 +867,6 @@ static bool alua_rtpg_queue(struct alua_port_group *pg,
{
int start_queue = 0;
unsigned long flags;
struct workqueue_struct *alua_wq = kaluad_wq;
if (WARN_ON_ONCE(!pg) || scsi_device_get(sdev))
return false;
@ -900,12 +891,10 @@ static bool alua_rtpg_queue(struct alua_port_group *pg,
}
}
if (pg->flags & ALUA_SYNC_STPG)
alua_wq = kaluad_sync_wq;
spin_unlock_irqrestore(&pg->lock, flags);
if (start_queue) {
if (queue_delayed_work(alua_wq, &pg->rtpg_work,
if (queue_delayed_work(kaluad_wq, &pg->rtpg_work,
msecs_to_jiffies(ALUA_RTPG_DELAY_MSECS)))
sdev = NULL;
else
@ -1166,16 +1155,11 @@ static int __init alua_init(void)
/* Temporary failure, bypass */
return SCSI_DH_DEV_TEMP_BUSY;
}
kaluad_sync_wq = create_workqueue("kaluad_sync");
if (!kaluad_sync_wq) {
destroy_workqueue(kaluad_wq);
return SCSI_DH_DEV_TEMP_BUSY;
}
r = scsi_register_device_handler(&alua_dh);
if (r != 0) {
printk(KERN_ERR "%s: Failed to register scsi device handler",
ALUA_DH_NAME);
destroy_workqueue(kaluad_sync_wq);
destroy_workqueue(kaluad_wq);
}
return r;
@ -1184,7 +1168,6 @@ static int __init alua_init(void)
static void __exit alua_exit(void)
{
scsi_unregister_device_handler(&alua_dh);
destroy_workqueue(kaluad_sync_wq);
destroy_workqueue(kaluad_wq);
}

1
include/scsi/scsi_device.h
View File

@ -181,7 +181,6 @@ struct scsi_device {
unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
unsigned broken_fua:1; /* Don't set FUA bit */
unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
unsigned synchronous_alua:1; /* Synchronous ALUA commands */
atomic_t disk_events_disable_depth; /* disable depth for disk events */