Re: [PATCH 3/3] Make scsi_free_queue() abort pending requests

[Bart Van Assche <bvanassche@xxxxxxx>]

On 05/04/12 20:25, Mike Christie wrote:

> On 05/04/2012 10:07 AM, Bart Van Assche wrote:
>> It is possible that a SCSI LLD invokes scsi_remove_host() after a
>> request has been queued via scsi_host_template.queuecommand() but
>> before scsi_done() has been invoked for that request. This may
> 
> If that happens won't we wait in blk_cleanup_queue->blk_drain_queue for
> that IO to be completed (completed normally or timed out and processed
> through that path)?

As far as I understand the block layer requests that have been queued
but for which scsi_request_fn() has not yet been invoked are on the
request_queue.queue_head list. Requests that have been passed to the
SCSI LLD but for which scsi_done() has not yet been invoked are on the
request_queue.timeout_list list. blk_drain_queue() works on the former
list while blk_abort_queue() processes the latter.

Bart.
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