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[S390] dasd: prevent path verification before resume 

Mark the device as suspended and delay execution of the path
verification worker to prevent mix-up.

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 2011-10-30 15:17:09 +01:00 committed by Martin Schwidefsky
parent 6ffed94ea7
commit c8d1c0ff84
3 changed files with 17 additions and 2 deletions
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4
drivers/s390/block/dasd.c
View File

@ -3289,6 +3289,9 @@ int dasd_generic_pm_freeze(struct ccw_device *cdev)
if (IS_ERR(device))
return PTR_ERR(device);
/* mark device as suspended */
set_bit(DASD_FLAG_SUSPENDED, &device->flags);
if (device->discipline->freeze)
rc = device->discipline->freeze(device);
@ -3363,6 +3366,7 @@ int dasd_generic_restore_device(struct ccw_device *cdev)
if (device->block)
dasd_schedule_block_bh(device->block);
clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
dasd_put_device(device);
return 0;
}

14
drivers/s390/block/dasd_eckd.c
View File

@ -1101,6 +1101,12 @@ static void do_path_verification_work(struct work_struct *work)
data = container_of(work, struct path_verification_work_data, worker);
device = data->device;
/* delay path verification until device was resumed */
if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
schedule_work(work);
return;
}
opm = 0;
npm = 0;
ppm = 0;
@ -2047,9 +2053,13 @@ static void dasd_eckd_check_for_device_change(struct dasd_device *device,
/* first of all check for state change pending interrupt */
mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
if ((scsw_dstat(&irb->scsw) & mask) == mask) {
/* for alias only and not in offline processing*/
/*
* for alias only, not in offline processing
* and only if not suspended
*/
if (!device->block && private->lcu &&
!test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
!test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
!test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
/*
* the state change could be caused by an alias
* reassignment remove device from alias handling

1
drivers/s390/block/dasd_int.h
View File

@ -516,6 +516,7 @@ struct dasd_block {
*/
#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
void dasd_put_device_wake(struct dasd_device *);