linux-kernel - Re: [PATCH RESEND] remove the queue unlock in scsi_requset

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Message-ID: <CAOAMb1COJbAF=ys7ZcpTuJNP6QzbQzuqz7gS4qPqSc1rfbnHTw@mail.gmail.com>
Date:	Thu, 16 Aug 2012 10:35:59 +0900
From:	Chanho Min <chanho0207@...il.com>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Mike Christie <michaelc@...wisc.edu>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Tejun Heo <tj@...nel.org>, Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH RESEND] remove the queue unlock in scsi_requset_fn

> functions will occur in line.  I also don't see why the sdev reference
> couldn't drop to zero here.
scsi_request_fn is called under the lock of request_queue->queue_lock.
If we drop the sdev reference to zero here,
scsi_device_dev_release_usercontext is
invoked and make request_queue to NULL. When caller of scsi_request_fn try to
unlock request_queue->queue_lock, the oops is occurred.

Thanks, Chanho
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