From: Jens Axboe <axboe@suse.de>
To: Luben Tuikov <luben@splentec.com>
Cc: linux-scsi <linux-scsi@vger.kernel.org>
Subject: Re: Q: assumptions on make_request() and request_fn()
Date: Thu, 19 Sep 2002 08:23:45 +0200 [thread overview]
Message-ID: <20020919062345.GH16579@suse.de> (raw)
In-Reply-To: <3D88E7BC.63735D7E@splentec.com>
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
prev parent reply other threads:[~2002-09-19 6:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-18 20:53 Q: assumptions on make_request() and request_fn() Luben Tuikov
2002-09-19 6:23 ` Jens Axboe [this message]
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