linux-kernel - Re: [PATCH v3 0/2] block,scsi: fixup blk_get

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Date:	Wed, 27 Aug 2014 10:05:36 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Boaz Harrosh <openosd@...il.com>, Jeff Moyer <jmoyer@...hat.com>
CC:	Joe Lawrence <joe.lawrence@...atus.com>,
	linux-kernel@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>,
	Boaz Harrosh <bharrosh@...asas.com>
Subject: Re: [PATCH v3 0/2] block,scsi: fixup blk_get_request dead queue scenarios

On 08/27/2014 09:50 AM, Boaz Harrosh wrote:
> On 08/27/2014 05:07 PM, Jens Axboe wrote:
>> On 08/26/2014 04:01 PM, Jeff Moyer wrote:
>>> Jens Axboe <axboe@...nel.dk> writes:
> <>
>> There's also a bug in osd_initiator.c, _init_blk_request(). We jump to
>> 'out' for IS_ERR(req), which attempts to print or->request, which hasn't
>> been assigned yet. 
> 
> You mean this code:
> 	req = _make_request(q, has_out, has_out ? &or->out : &or->in, flags);
> 	if (IS_ERR(req)) {
> 		ret = PTR_ERR(req);
> 		goto out;
> 	}
> 
> 	or->request = req;
> 
> But _make_request used to already return -ENOMEM as a pointer in req
> So if this is a bug it was not introduced by this patch.

Joe brought this up too, I guess it's been there before this patch.

> And it is not a bug at all the print prints the pointer. The all of
> this code assumes osd_request was allocated ZERO set. the print of %p
> is fine with NULLs (and any number for that matter)

If or->request is NULL initialized, it's fine. I didn't track the path
to check if it was garbage or NULL.

> I have reviewed this patch for osd part, it is fine

Thanks!

-- 
Jens Axboe

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