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[SCSI] libsas: Add SAS_HA state flags to avoid queueing events while unloading 

Track sas_ha_struct state so that we ignore events that come in while
we're shutting things down.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Darrick J. Wong 2007-01-11 14:15:43 -08:00 committed by James Bottomley
parent 980fa2f9d6
commit 6b0efb8516
5 changed files with 31 additions and 6 deletions
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2
drivers/scsi/libsas/sas_discover.c
View File

@ -753,7 +753,7 @@ int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
BUG_ON(ev >= DISC_NUM_EVENTS);
sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
&disc->disc_work[ev].work, port->ha->core.shost);
&disc->disc_work[ev].work, port->ha);
return 0;
}

6
drivers/scsi/libsas/sas_event.c
View File

@ -31,7 +31,7 @@ static void notify_ha_event(struct sas_ha_struct *sas_ha, enum ha_event event)
BUG_ON(event >= HA_NUM_EVENTS);
sas_queue_event(event, &sas_ha->event_lock, &sas_ha->pending,
&sas_ha->ha_events[event].work, sas_ha->core.shost);
&sas_ha->ha_events[event].work, sas_ha);
}
static void notify_port_event(struct asd_sas_phy *phy, enum port_event event)
@ -41,7 +41,7 @@ static void notify_port_event(struct asd_sas_phy *phy, enum port_event event)
BUG_ON(event >= PORT_NUM_EVENTS);
sas_queue_event(event, &ha->event_lock, &phy->port_events_pending,
&phy->port_events[event].work, ha->core.shost);
&phy->port_events[event].work, ha);
}
static void notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
@ -51,7 +51,7 @@ static void notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
BUG_ON(event >= PHY_NUM_EVENTS);
sas_queue_event(event, &ha->event_lock, &phy->phy_events_pending,
&phy->phy_events[event].work, ha->core.shost);
&phy->phy_events[event].work, ha);
}
int sas_init_events(struct sas_ha_struct *sas_ha)

12
drivers/scsi/libsas/sas_init.c
View File

@ -87,6 +87,9 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
else if (sas_ha->lldd_queue_size == -1)
sas_ha->lldd_queue_size = 128; /* Sanity */
sas_ha->state = SAS_HA_REGISTERED;
spin_lock_init(&sas_ha->state_lock);
error = sas_register_phys(sas_ha);
if (error) {
printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
@ -127,6 +130,15 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
int sas_unregister_ha(struct sas_ha_struct *sas_ha)
{
unsigned long flags;
/* Set the state to unregistered to avoid further
* events to be queued */
spin_lock_irqsave(&sas_ha->state_lock, flags);
sas_ha->state = SAS_HA_UNREGISTERED;
spin_unlock_irqrestore(&sas_ha->state_lock, flags);
scsi_flush_work(sas_ha->core.shost);
sas_unregister_ports(sas_ha);
if (sas_ha->lldd_max_execute_num > 1) {

9
drivers/scsi/libsas/sas_internal.h
View File

@ -80,7 +80,7 @@ void sas_hae_reset(struct work_struct *work);
static inline void sas_queue_event(int event, spinlock_t *lock,
unsigned long *pending,
struct work_struct *work,
struct Scsi_Host *shost)
struct sas_ha_struct *sas_ha)
{
unsigned long flags;
@ -91,7 +91,12 @@ static inline void sas_queue_event(int event, spinlock_t *lock,
}
__set_bit(event, pending);
spin_unlock_irqrestore(lock, flags);
scsi_queue_work(shost, work);
spin_lock_irqsave(&sas_ha->state_lock, flags);
if (sas_ha->state != SAS_HA_UNREGISTERED) {
scsi_queue_work(sas_ha->core.shost, work);
}
spin_unlock_irqrestore(&sas_ha->state_lock, flags);
}
static inline void sas_begin_event(int event, spinlock_t *lock,

8
include/scsi/libsas.h
View File

@ -323,12 +323,20 @@ struct sas_ha_event {
struct sas_ha_struct *ha;
};
enum sas_ha_state {
SAS_HA_REGISTERED,
SAS_HA_UNREGISTERED
};
struct sas_ha_struct {
/* private: */
spinlock_t event_lock;
struct sas_ha_event ha_events[HA_NUM_EVENTS];
unsigned long pending;
enum sas_ha_state state;
spinlock_t state_lock;
struct scsi_core core;
/* public: */