From: Stefan Haberland <s...@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 <s...@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/s390/block/dasd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index e7a6f1222642..b76a85d14ef0 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1881,8 +1881,12 @@ 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) {
-- 
2.15.1

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