Q: assumptions on make_request() and request

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* Q: assumptions on make_request() and request_fn()
@ 2002-09-18 20:53 Luben Tuikov
  2002-09-19  6:23 ` Jens Axboe
  0 siblings, 1 reply; 2+ messages in thread
From: Luben Tuikov @ 2002-09-18 20:53 UTC (permalink / raw)
  To: linux-scsi

What are the assumtions for calling make_request() or
the request_fn()?

Interrupt context or process context or both?

(2.4/2.5)

Thanks,
-- 
Luben

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: Q: assumptions on make_request() and request_fn()
  2002-09-18 20:53 Q: assumptions on make_request() and request_fn() Luben Tuikov
@ 2002-09-19  6:23 ` Jens Axboe
  0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2002-09-19  6:23 UTC (permalink / raw)
  To: Luben Tuikov; +Cc: linux-scsi

On Wed, Sep 18 2002, Luben Tuikov wrote:
> What are the assumtions for calling make_request() or
> the request_fn()?
> 
> Interrupt context or process context or both?

make_request_fn() is called from process context, no locks held. It
often sleeps.

request_fn() is called with (2.4: io_request_lock, 2.5: q->queue_lock)
held, and interrupts disabled. The context _may_ be process, it may also
be from an interrupt handler for requeueing etc.

-- 
Jens Axboe

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2002-09-18 20:53 Q: assumptions on make_request() and request_fn() Luben Tuikov
2002-09-19  6:23 ` Jens Axboe

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