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From: Andy Walls on 19 Jul 2010 17:50
On Mon, 2010-07-19 at 19:39 +0200, Jiri Slaby wrote:
> Stanse found that in ivtvfb_callback_cleanup and ivtvfb_callback_init
> there are unneeded tests for itv being NULL. But itv is initialized
> as container_of with non-zero offset in those functions, so it is
> never NULL (even if v4l2_dev is). This was found because itv is
> dereferenced earlier than the test.
>
> Signed-off-by: Jiri Slaby <jslaby(a)suse.cz>
> Cc: Andy Walls <awalls(a)md.metrocast.net>

Looks fine to me.

Reviewed-by: Andy Walls <awalls(a)md.metrocast.net>

Regards,
Andy

> Cc: Mauro Carvalho Chehab <mchehab(a)infradead.org>
> Cc: Tejun Heo <tj(a)kernel.org>
> Cc: Ian Armstrong <ian(a)iarmst.demon.co.uk>
> Cc: ivtv-devel(a)ivtvdriver.org
> Cc: linux-media(a)vger.kernel.org
> ---
> drivers/media/video/ivtv/ivtvfb.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/video/ivtv/ivtvfb.c b/drivers/media/video/ivtv/ivtvfb.c
> index 9ff3425..9c77bfa 100644
> --- a/drivers/media/video/ivtv/ivtvfb.c
> +++ b/drivers/media/video/ivtv/ivtvfb.c
> @@ -1203,7 +1203,7 @@ static int __init ivtvfb_callback_init(struct device *dev, void *p)
> struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
> struct ivtv *itv = container_of(v4l2_dev, struct ivtv, v4l2_dev);
>
> - if (itv && (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT)) {
> + if (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT) {
> if (ivtvfb_init_card(itv) == 0) {
> IVTVFB_INFO("Framebuffer registered on %s\n",
> itv->v4l2_dev.name);
> @@ -1219,7 +1219,7 @@ static int ivtvfb_callback_cleanup(struct device *dev, void *p)
> struct ivtv *itv = container_of(v4l2_dev, struct ivtv, v4l2_dev);
> struct osd_info *oi = itv->osd_info;
>
> - if (itv && (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT)) {
> + if (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT) {
> if (unregister_framebuffer(&itv->osd_info->ivtvfb_info)) {
> IVTVFB_WARN("Framebuffer %d is in use, cannot unload\n",
> itv->instance);


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