Re: kmemleak report on isp1763 and sierra MC8705

[Richard Retanubun]

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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