From: Stefan Haberland Date: Thu, 18 May 2017 11:24:45 +0000 (+0200) Subject: s390/dasd: fix hanging safe offline X-Git-Tag: v4.13-rc1~192^2~19 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=e8ac01555d9e464249e8bb122337d6d6e5589ccc;p=linux-block.git s390/dasd: fix hanging safe offline 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 Signed-off-by: Martin Schwidefsky --- diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index b0c65dcb6865..c72ac57940f4 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1965,8 +1965,12 @@ 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) {