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[S390] cio: Use path verification for last path gone after vary off.

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If the last path to a device is gone after a chpid has been varied
off, putting it on the slow queue doesn't prevent a device driver
from still attempting to use it (it may stay on the slow queue for a
long time). Instead, trigger a verify event which will prevent I/O
attempts from the device driver immediately.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2006-12-04 15:41:01 +01:00 committed by Martin Schwidefsky
parent 9163bb2e55
commit 24cb5b4846
3 changed files with 24 additions and 10 deletions
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22
drivers/s390/cio/chsc.c
View File

@ -744,20 +744,22 @@ __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
device_trigger_reprobe(sch);
else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
} else {
sch->opm &= ~(0x80 >> chp);
sch->lpm &= ~(0x80 >> chp);
if (check_for_io_on_path(sch, chp))
/* Path verification is done after killing. */
device_kill_io(sch);
else if (!sch->lpm) {
break;
}
sch->opm &= ~(0x80 >> chp);
sch->lpm &= ~(0x80 >> chp);
if (check_for_io_on_path(sch, chp))
/* Path verification is done after killing. */
device_kill_io(sch);
else if (!sch->lpm) {
if (device_trigger_verify(sch) != 0) {
if (css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
} else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
}
}
} else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
break;
}
spin_unlock_irqrestore(&sch->lock, flags);

1
drivers/s390/cio/css.h
View File

@ -171,6 +171,7 @@ void device_trigger_reprobe(struct subchannel *);
/* Helper functions for vary on/off. */
int device_is_online(struct subchannel *);
void device_kill_io(struct subchannel *);
int device_trigger_verify(struct subchannel *sch);
/* Machine check helper function. */
void device_kill_pending_timer(struct subchannel *);

11
drivers/s390/cio/device_fsm.c
View File

@ -59,6 +59,17 @@ device_set_disconnected(struct subchannel *sch)
cdev->private->state = DEV_STATE_DISCONNECTED;
}
int device_trigger_verify(struct subchannel *sch)
{
struct ccw_device *cdev;
cdev = sch->dev.driver_data;
if (!cdev || !cdev->online)
return -EINVAL;
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
return 0;
}
/*
* Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
*/