linux-kernel - Re: [PATCH] fix NULL-pointer dereference on scsi_run

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Message-ID: <501D83A1.7040900@acm.org>
Date:	Sat, 04 Aug 2012 20:18:41 +0000
From:	Bart Van Assche <bvanassche@....org>
To:	Mike Christie <michaelc@...wisc.edu>
CC:	Chanho Min <chanho0207@...il.com>,
	James Bottomley <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] fix NULL-pointer dereference on scsi_run_queue

On 08/04/12 16:46, Mike Christie wrote:
> I think we have to have scsi-ml do a get_device when a sdev is added to
> the starved entry and then do a put_device when it is removed (must do
> these under the host lock for the starved entry case too). I am not sure
> if that is just a hack/papering-over of the problem and there are more
> issues like this.

That would result in a more complex patch than the patch at the start of
this thread, isn't it ? Also, IMHO it would help to document which
functions in the scsi-ml are called with an sdev reference and which
ones not. That would make the scsi-ml code easier to verify for issues
like the one reported at the start of this thread.

Bart.

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