linux-kernel - Re: kmemleak report on isp1763 and sierra MC8705

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Message-ID: <50A3D0E1.4060209@ruggedcom.com>
Date:	Wed, 14 Nov 2012 12:12:01 -0500
From:	Richard Retanubun <richardretanubun@...gedcom.com>
To:	Johan Hovold <jhovold@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Tang Nguyen <TangNguyen@...gedcom.com>,
	linux-usb mailing list <linux-usb@...r.kernel.org>
Subject: Re: kmemleak report on isp1763 and sierra MC8705

On 10/11/12 09:30 AM, Johan Hovold wrote:
Hi Johan,

> There was a reference-count fix for the probe error path that went in to
> v3.5. Haven't read all the details on how you trigger your leak, but at
> the face of it, it could be related.
>
> Have a look at 0658a3366db7e27fa ("usb: use usb_serial_put in
> usb_serial_probe errors). If related, you should be seeing "Ignoring
> blacklisted interface #n" messages when you enable debug (e.g. #define
> DEBUG) in the sierra driver.

That was it! Thanks so much for the research.
I can apply it cleanly to 3.0.22 and see usb_release_dev() being called and thus no more kmemleak.

>
> Greg, it seems to me that the fix referred to above should be backported
> to the earlier stable trees either way.
I would vote "yes" for this also.

While my setup circumstances may be a corner case, (modem kept resetting to re-establish PPP connection)
it was leaking 1192 bytes per occurrence.

Thanks for everyone's time.

-- Richard Retanubun.
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