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s390/dasd: fix hanging safe offline

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[ Upstream commit e8ac01555d ]

The safe offline processing may hang forever because it waits for I/O
which can not be started because of the offline flag that prevents new
I/O from being started.

Allow I/O to be started during safe offline processing because in this
special case we take care that the queues are empty before throwing away
the device.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Haberland
2017-05-18 13:24:45 +02:00
committed by Greg Kroah-Hartman
parent 352b45c2ff
commit d5a4ef2bce
1 changed files with 6 additions and 2 deletions
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8
drivers/s390/block/dasd.c
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@@ -1950,8 +1950,12 @@ static int __dasd_device_is_unusable(struct dasd_device *device,
{
int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
/* dasd is being set offline. */
if (test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
/*
* dasd is being set offline
* but it is no safe offline where we have to allow I/O
*/
return 1;
}
if (device->stopped) {