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[S390] qdio: Repair timeout handling for qdio_shutdown 

If qdio shutdown runs in parallel with a channel error,
the qdio_timeout_handler might not be triggered.
In this case neither state INACTIVE nor state ERR
is reached and the following wait_event hangs forever.
Solution: do not make use of ccw_device_set_timeout(),
but add a timeout to the following wait_event.
And make sure, wake_up is called in case of an
i/o error on the qdio-device.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Ursula Braun 2008-07-14 09:57:25 +02:00 committed by Heiko Carstens
parent b1c02d9110
commit bb0ca330a7
1 changed files with 7 additions and 13 deletions
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20
drivers/s390/cio/qdio.c
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@ -2082,7 +2082,6 @@ qdio_timeout_handler(struct ccw_device *cdev)
default:
BUG();
}
ccw_device_set_timeout(cdev, 0);
wake_up(&cdev->private->wait_q);
}
@ -2121,6 +2120,8 @@ qdio_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
case -EIO:
QDIO_PRINT_ERR("i/o error on device %s\n",
cdev->dev.bus_id);
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
wake_up(&cdev->private->wait_q);
return;
case -ETIMEDOUT:
qdio_timeout_handler(cdev);
@ -2667,12 +2668,12 @@ qdio_shutdown(struct ccw_device *cdev, int how)
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
} else if (rc == 0) {
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
ccw_device_set_timeout(cdev, timeout);
spin_unlock_irqrestore(get_ccwdev_lock(cdev),flags);
wait_event(cdev->private->wait_q,
irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
irq_ptr->state == QDIO_IRQ_STATE_ERR);
wait_event_interruptible_timeout(cdev->private->wait_q,
irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
irq_ptr->state == QDIO_IRQ_STATE_ERR,
timeout);
} else {
QDIO_PRINT_INFO("ccw_device_{halt,clear} returned %d for "
"device %s\n", result, cdev->dev.bus_id);
@ -2692,7 +2693,6 @@ qdio_shutdown(struct ccw_device *cdev, int how)
/* Ignore errors. */
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
ccw_device_set_timeout(cdev, 0);
out:
up(&irq_ptr->setting_up_sema);
return result;
@ -2907,13 +2907,10 @@ qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, int dstat)
QDIO_DBF_TEXT0(0,setup,dbf_text);
QDIO_DBF_TEXT0(0,trace,dbf_text);
if (qdio_establish_irq_check_for_errors(cdev, cstat, dstat)) {
ccw_device_set_timeout(cdev, 0);
if (qdio_establish_irq_check_for_errors(cdev, cstat, dstat))
return;
}
qdio_set_state(irq_ptr,QDIO_IRQ_STATE_ESTABLISHED);
ccw_device_set_timeout(cdev, 0);
}
int
@ -3196,8 +3193,6 @@ qdio_establish(struct qdio_initialize *init_data)
irq_ptr->schid.ssid, irq_ptr->schid.sch_no,
result, result2);
result=result2;
if (result)
ccw_device_set_timeout(cdev, 0);
}
spin_unlock_irqrestore(get_ccwdev_lock(cdev),saveflags);
@ -3279,7 +3274,6 @@ qdio_activate(struct ccw_device *cdev, int flags)
spin_lock_irqsave(get_ccwdev_lock(cdev),saveflags);
ccw_device_set_timeout(cdev, 0);
ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
result=ccw_device_start(cdev,&irq_ptr->ccw,QDIO_DOING_ACTIVATE,
0, DOIO_DENY_PREFETCH);