From: Ezequiel Garcia <elezegarcia@gmail.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
Julia.Lawall@lip6.fr, kernel-janitors@vger.kernel.org,
Peter Senna Tschudin <peter.senna@gmail.com>
Subject: Re: [PATCH 01/23] uvc: Replace memcpy with struct assignment
Date: Sat, 12 Jan 2013 14:44:38 -0300 [thread overview]
Message-ID: <CALF0-+WigCJULSdSzSKNUbNJ2S_v=jN1h7t3xZTp7NwxZjL09w@mail.gmail.com> (raw)
In-Reply-To: <1615162.CJ0Ejj80il@avalon>
On Wed, Jan 9, 2013 at 9:19 PM, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
> Hi Ezequiel,
>
> On Thursday 27 December 2012 21:49:37 Mauro Carvalho Chehab wrote:
>> Em Thu, 27 Dec 2012 18:12:46 -0300 Ezequiel Garcia escreveu:
>> > On Tue, Oct 23, 2012 at 4:57 PM, Ezequiel Garcia wrote:
>> > > This kind of memcpy() is error-prone. Its replacement with a struct
>> > > assignment is prefered because it's type-safe and much easier to read.
>> > >
>> > > Found by coccinelle. Hand patched and reviewed.
>> > > Tested by compilation only.
>> > >
>> > > A simplified version of the semantic match that finds this problem is as
>> > > follows: (http://coccinelle.lip6.fr/)
>> > >
>> > > // <smpl>
>> > > @@
>> > > identifier struct_name;
>> > > struct struct_name to;
>> > > struct struct_name from;
>> > > expression E;
>> > > @@
>> > > -memcpy(&(to), &(from), E);
>> > > +to = from;
>> > > // </smpl>
>> > >
>> > > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>> > > Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
>> > > Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
>> > > ---
>> > >
>> > > drivers/media/usb/uvc/uvc_v4l2.c | 6 +++---
>> > > 1 files changed, 3 insertions(+), 3 deletions(-)
>> > >
>> > > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c
>> > > b/drivers/media/usb/uvc/uvc_v4l2.c index f00db30..4fc8737 100644
>> > > --- a/drivers/media/usb/uvc/uvc_v4l2.c
>> > > +++ b/drivers/media/usb/uvc/uvc_v4l2.c
>> > > @@ -314,7 +314,7 @@ static int uvc_v4l2_set_format(struct uvc_streaming
>> > > *stream,
>> > > goto done;
>> > > }
>> > >
>> > > - memcpy(&stream->ctrl, &probe, sizeof probe);
>> > > + stream->ctrl = probe;
>> > >
>> > > stream->cur_format = format;
>> > > stream->cur_frame = frame;
>> > > @@ -386,7 +386,7 @@ static int uvc_v4l2_set_streamparm(struct
>> > > uvc_streaming *stream,
>> > > return -EBUSY;
>> > > }
>> > >
>> > > - memcpy(&probe, &stream->ctrl, sizeof probe);
>> > > + probe = stream->ctrl;
>> > > probe.dwFrameInterval =
>> > > uvc_try_frame_interval(stream->cur_frame, interval);
>> > >
>> > > @@ -397,7 +397,7 @@ static int uvc_v4l2_set_streamparm(struct
>> > > uvc_streaming *stream,
>> > > return ret;
>> > > }
>> > >
>> > > - memcpy(&stream->ctrl, &probe, sizeof probe);
>> > > + stream->ctrl = probe;
>> > > mutex_unlock(&stream->mutex);
>> > >
>> > > /* Return the actual frame period. */
>> >
>> > It seems you've marked this one as "Changes requested" [1].
>> > However, Laurent didn't request any change,
>> > but just pointed out we missed one memcpy replacement candidate.
>> >
>> > I believe it's safe to apply the patch (together with the other 20
>> > patches) and we can fix the missing spot in another patch.
>>
>> The other patches got applied already. Well just do whatever Laurent asked
>> you and re-submit this one ;)
>
> Could you please resubmit this patch with the missed memcpy replaced by a
> struct assignment ? I'll then add it to my tree.
>
Sure!
Thanks,
--
Ezequiel
prev parent reply other threads:[~2013-01-12 17:44 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-23 19:57 [PATCH 01/23] uvc: Replace memcpy with struct assignment Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 02/23] cx231xx: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 03/23] usbvision: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 04/23] sn9c102: " Ezequiel Garcia
2012-10-24 0:50 ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 05/23] pwc: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 06/23] pvrusb2: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 07/23] hdpvr: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 08/23] cx25840: " Ezequiel Garcia
2012-10-23 22:20 ` Andy Walls
2012-10-23 19:57 ` [PATCH 09/23] zr36067: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 10/23] dvb-usb/friio-fe: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 11/23] au0828: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 12/23] tuners/xc4000: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 13/23] tuners/xc2028: " Ezequiel Garcia
2012-10-23 22:36 ` Andy Walls
2012-10-23 19:57 ` [PATCH 14/23] tuners/tda18271: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 15/23] ivtv: " Ezequiel Garcia
2012-10-23 22:08 ` Andy Walls
2012-10-24 0:28 ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 16/23] cx88: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 17/23] cx23885: " Ezequiel Garcia
2012-10-23 22:16 ` Andy Walls
2012-10-24 0:52 ` Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 18/23] cx18: " Ezequiel Garcia
2012-10-23 22:17 ` Andy Walls
2012-10-23 19:57 ` [PATCH 19/23] bttv: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 20/23] dvb-core: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 21/23] dvb-frontends: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 22/23] radio-wl1273: " Ezequiel Garcia
2012-10-23 19:57 ` [PATCH 23/23] wl128x: " Ezequiel Garcia
2012-10-24 22:35 ` [PATCH 01/23] uvc: " Laurent Pinchart
2012-10-24 23:10 ` Andy Walls
2012-12-27 21:12 ` Ezequiel Garcia
2012-12-27 23:49 ` Mauro Carvalho Chehab
2013-01-10 0:19 ` Laurent Pinchart
2013-01-12 17:44 ` Ezequiel Garcia [this message]
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