Re: [PATCH] null_blk: allow teardown on request timeout

[Chaitanya Kulkarni]

>> +	/*
>> +	 * Unblock any pending dispatch I/Os before we destroy the device.
>> +	 * From null_destroy_dev()->del_gendisk() will set GD_DEAD flag
>> +	 * causing any new I/O from __bio_queue_enter() to fail with -ENODEV.
>> +	 */
>> +	blk_mq_unquiesce_queue(nullb->q);
>> +
>> +	null_destroy_dev(nullb);
> 
> destroying device is never good cleanup for handling timeout/abort, and it
> should have been the last straw any time.
> 

That is exactly why I've added the rq_abort_limit, so until the limit
is not reached null_abort_work() will not get scheduled and device is
not destroyed.

-ck