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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2006-12-04 15:41:01 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-12-04 15:41:01 +0100 |
| commit | 24cb5b4846ebae5543869b5c596c2650f380df53 (patch) | |
| tree | fd45cf7fab0a065c7529c5811e3258a66e877095 /drivers/s390 | |
| parent | 9163bb2e556f6c7879961df94540f0879db4717b (diff) | |
| download | linux-24cb5b4846ebae5543869b5c596c2650f380df53.tar.gz linux-24cb5b4846ebae5543869b5c596c2650f380df53.tar.bz2 linux-24cb5b4846ebae5543869b5c596c2650f380df53.zip | |
[S390] cio: Use path verification for last path gone after vary off.
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>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/chsc.c | 22 | ||||
| -rw-r--r-- | drivers/s390/cio/css.h | 1 | ||||
| -rw-r--r-- | drivers/s390/cio/device_fsm.c | 11 |
3 files changed, 24 insertions, 10 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index 9d92540bd99e..11900de94cb3 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -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); diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h index 4c2ff8336288..da73453fa54b 100644 --- a/drivers/s390/cio/css.h +++ b/drivers/s390/cio/css.h @@ -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 *); diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c index de3d0857db9f..7665000e8dfe 100644 --- a/drivers/s390/cio/device_fsm.c +++ b/drivers/s390/cio/device_fsm.c @@ -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. */ |