Mauro, On Tue, Oct 23, 2012 at 4:57 PM, Ezequiel Garcia <elezegarcia@xxxxxxxxx> 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@xxxxxxxxxxxxxxxx> > Signed-off-by: Peter Senna Tschudin <peter.senna@xxxxxxxxx> > Signed-off-by: Ezequiel Garcia <elezegarcia@xxxxxxxxx> > --- > 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
