From: Stefan Haberland Date: Fri, 5 Mar 2021 13:54:39 +0100 Subject: s390/dasd: fix hanging IO request during DASD driver unbind Git-commit: 66f669a272898feb1c69b770e1504aa2ec7723d1 Patch-mainline: v5.12-rc3 References: bsc#1183754 LTC#192081 Prevent that an IO request is build during device shutdown initiated by a driver unbind. This request will never be able to be processed or canceled and will hang forever. This will lead also to a hanging unbind. Fix by checking not only if the device is in READY state but also check that there is no device offline initiated before building a new IO request. Fixes: e443343e509a ("s390/dasd: blk-mq conversion") Cc: # v4.14+ Signed-off-by: Stefan Haberland Tested-by: Bjoern Walk Reviewed-by: Jan Hoeppner Signed-off-by: Jens Axboe Acked-by: Petr Tesarik --- drivers/s390/block/dasd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -2925,7 +2925,8 @@ static blk_status_t do_dasd_request(stru basedev = block->base; spin_lock_irq(&dq->lock); - if (basedev->state < DASD_STATE_READY) { + if (basedev->state < DASD_STATE_READY || + test_bit(DASD_FLAG_OFFLINE, &basedev->flags)) { DBF_DEV_EVENT(DBF_ERR, basedev, "device not ready for request %p", req); rc = BLK_STS_IOERR;