This is a note to let you know that I've just added the patch titled
s390/dasd: fix hanging safe offline
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: s390-dasd-fix-hanging-safe-offline.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Apr 10 10:31:53 CEST 2018
From: Stefan Haberland sth@linux.vnet.ibm.com Date: Thu, 18 May 2017 13:24:45 +0200 Subject: s390/dasd: fix hanging safe offline
From: Stefan Haberland sth@linux.vnet.ibm.com
[ Upstream commit e8ac01555d9e464249e8bb122337d6d6e5589ccc ]
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 --- drivers/s390/block/dasd.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1881,8 +1881,12 @@ static int __dasd_device_is_unusable(str { 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) {
Patches currently in stable-queue which might be from sth@linux.vnet.ibm.com are
queue-4.4/s390-dasd-fix-hanging-safe-offline.patch