linux-kernel - Re: [PATCH] HID: lg: fix noderef.cocci warnings

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Message-ID: <20161123022231.dnvneqc7jrvzv7zp@wfg-t540p.sh.intel.com>
Date:   Wed, 23 Nov 2016 10:22:31 +0800
From:   Fengguang Wu <lkp@...el.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        kbuild-all@...org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>
Subject: Re: [PATCH] HID: lg: fix noderef.cocci warnings

On Tue, Nov 22, 2016 at 11:44:34AM +0100, Jiri Kosina wrote:
>On Mon, 21 Nov 2016, Benjamin Tissoires wrote:
>
>> > Generated by: scripts/coccinelle/misc/noderef.cocci
>> >
>> > CC: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>> > Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
>> > ---
>> >
>> >  hid-lg.c |    6 ++++--
>> >  1 file changed, 4 insertions(+), 2 deletions(-)
>> >
>> > --- a/drivers/hid/hid-lg.c
>> > +++ b/drivers/hid/hid-lg.c
>> > @@ -777,8 +777,10 @@ static int lg_probe(struct hid_device *h
>> >  			buf[1] = 0xB2;
>> >  			get_random_bytes(&buf[2], 2);
>> >
>> > -			ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(buf),
>> > -					HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
>> > +			ret = hid_hw_raw_request(hdev, buf[0], buf,
>> > +						 sizeof(*buf),
>>
>> This is wrong. I messed up and should have used "sizeof(cbuf)", but the
>> coccinelle script failed at detecting the correct solution (I guess it
>> couldn't).
>
>Fengguang, is there anything that could be done to improve this?

CC Julie and Gilles. I'm not sure if the coccinelle script could be
made that smart. :)

>> Jiri, do you want me to send a v2 of the series or will you just amend
>> the patch while applying?
>
>I'll fix that up, no worries. Thanks,
>
>-- 
>Jiri Kosina
>SUSE Labs