From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ezequiel Garcia Date: Tue, 23 Oct 2012 19:57:04 +0000 Subject: [PATCH 01/23] uvc: Replace memcpy with struct assignment Message-Id: <1351022246-8201-1-git-send-email-elezegarcia@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Cc: Julia.Lawall@lip6.fr, kernel-janitors@vger.kernel.org, Ezequiel Garcia , Laurent Pinchart , Peter Senna Tschudin 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/) // @@ identifier struct_name; struct struct_name to; struct struct_name from; expression E; @@ -memcpy(&(to), &(from), E); +to = from; // Cc: Laurent Pinchart Signed-off-by: Peter Senna Tschudin Signed-off-by: Ezequiel Garcia --- 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