blk-mq: Avoid that submitting a bio concurrently with device removal triggers a crash

blk-mq: Avoid that submitting a bio concurrently with device removal triggers a crash

Because blkcg_exit_queue() is now called from inside blk_cleanup_queue()
it is no longer safe to access cgroup information during or after the
blk_cleanup_queue() call. Hence protect the generic_make_request_checks()
call with blk_queue_enter() / blk_queue_exit().

Reported-by: Ming Lei <[email protected]>
Fixes: a063057d7c73 ("block: Fix a race between request queue removal and the block cgroup controller")
Signed-off-by: Bart Van Assche <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Joseph Qi <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>