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s390/dasd: fix list corruption for sleep_on requests

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Fix race for sleep_on requests leading to list corruption.
The SLEEP_ON_END_TAG is set during CQR clean up. Remove it from
interrupt handler to avoid the CQR from being cleared when it is
still in the device_queue.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2014-11-24 10:59:44 +01:00 committed by Martin Schwidefsky
parent 2c17124bf3
commit 932f0549f8
1 changed files with 0 additions and 3 deletions
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3
drivers/s390/block/dasd.c
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@ -1697,11 +1697,8 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
if (cqr->status == DASD_CQR_CLEAR_PENDING &&
scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
cqr->status = DASD_CQR_CLEARED;
if (cqr->callback_data == DASD_SLEEPON_START_TAG)
cqr->callback_data = DASD_SLEEPON_END_TAG;
dasd_device_clear_timer(device);
wake_up(&dasd_flush_wq);
wake_up(&generic_waitq);
dasd_schedule_device_bh(device);
return;
}