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ctcm: suspend has to wait for outstanding I/O

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State transition to DEV_STATE_STOPPED indicates all outstanding I/O has
finished. Add wait queue to wait for this state.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Frank Blaschka 2009-11-12 21:46:28 +00:00 committed by David S. Miller
parent b7c2aecc07
commit 1e1815be87
3 changed files with 8 additions and 0 deletions
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5
drivers/s390/net/ctcm_main.c
View file

@ -1720,6 +1720,11 @@ static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
return 0;
netif_device_detach(priv->channel[READ]->netdev);
ctcm_close(priv->channel[READ]->netdev);
if (!wait_event_timeout(priv->fsm->wait_q,
fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
netif_device_attach(priv->channel[READ]->netdev);
return -EBUSY;
}
ccw_device_set_offline(gdev->cdev[1]);
ccw_device_set_offline(gdev->cdev[0]);
return 0;

1
drivers/s390/net/fsm.c
View file

@ -27,6 +27,7 @@ init_fsm(char *name, const char **state_names, const char **event_names, int nr_
return NULL;
}
strlcpy(this->name, name, sizeof(this->name));
init_waitqueue_head(&this->wait_q);
f = kzalloc(sizeof(fsm), order);
if (f == NULL) {

2
drivers/s390/net/fsm.h
View file

@ -66,6 +66,7 @@ typedef struct fsm_instance_t {
char name[16];
void *userdata;
int userint;
wait_queue_head_t wait_q;
#if FSM_DEBUG_HISTORY
int history_index;
int history_size;
@ -197,6 +198,7 @@ fsm_newstate(fsm_instance *fi, int newstate)
printk(KERN_DEBUG "fsm(%s): New state %s\n", fi->name,
fi->f->state_names[newstate]);
#endif
wake_up(&fi->wait_q);
}
/**