From: Ezequiel Garcia <elezegarcia@gmail.com>
To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Cc: Julia.Lawall@lip6.fr, kernel-janitors@vger.kernel.org,
Ezequiel Garcia <elezegarcia@gmail.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Peter Senna Tschudin <peter.senna@gmail.com>,
Mauro Carvalho Chehab <mchehab@redhat.com>
Subject: Re: [PATCH 01/23] uvc: Replace memcpy with struct assignment
Date: Thu, 27 Dec 2012 18:12:46 -0300 [thread overview]
Message-ID: <CALF0-+VQKxu7_-=aJeW-FxmM4fdVX1nBE7AA5-0d9SRgRqqM1g@mail.gmail.com> (raw)
In-Reply-To: <1351022246-8201-1-git-send-email-elezegarcia@gmail.com>
Mauro,
On Tue, Oct 23, 2012 at 4:57 PM, Ezequiel Garcia <elezegarcia@gmail.com> 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. */
> --
> 1.7.4.4
>
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.
Thanks,
--
Ezequiel
[1] http://patchwork.linuxtv.org/patch/15142/
next prev parent reply other threads:[~2012-12-27 21:12 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 [this message]
2012-12-27 23:49 ` Mauro Carvalho Chehab
2013-01-10 0:19 ` Laurent Pinchart
2013-01-12 17:44 ` Ezequiel Garcia
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