[PATCH v3 7/9] staging: media: atmel: use for_each_endpoint_of_node()

[Dan Carpenter]

On Thu, May 30, 2024 at 02:06:22AM +0000, Kuninori Morimoto wrote:
> We already have for_each_endpoint_of_node(), don't use
> of_graph_get_next_endpoint() directly. Replace it.
> 
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
> ---
>  .../staging/media/deprecated/atmel/atmel-sama5d2-isc.c    | 8 ++------
>  .../staging/media/deprecated/atmel/atmel-sama7g5-isc.c    | 8 ++------
>  2 files changed, 4 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/media/deprecated/atmel/atmel-sama5d2-isc.c b/drivers/staging/media/deprecated/atmel/atmel-sama5d2-isc.c
> index 31b2b48085c59..3b28a232418a9 100644
> --- a/drivers/staging/media/deprecated/atmel/atmel-sama5d2-isc.c
> +++ b/drivers/staging/media/deprecated/atmel/atmel-sama5d2-isc.c
> @@ -333,20 +333,16 @@ static const u32 isc_sama5d2_gamma_table[][GAMMA_ENTRIES] = {
>  static int isc_parse_dt(struct device *dev, struct isc_device *isc)
>  {
>  	struct device_node *np = dev->of_node;
> -	struct device_node *epn = NULL;
> +	struct device_node *epn;
>  	struct isc_subdev_entity *subdev_entity;
>  	unsigned int flags;
>  	int ret;
>  
>  	INIT_LIST_HEAD(&isc->subdev_entities);
>  
> -	while (1) {
> +	for_each_endpoint_of_node(np, epn) {
>  		struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };
>  
> -		epn = of_graph_get_next_endpoint(np, epn);
> -		if (!epn)
> -			return 0;
> -
>  		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
>  						 &v4l2_epn);
>  		if (ret) {

This introduces a Smatch warning because now "ret" is uninitialized if
the for_each_endpoint_of_node() list is empty.  Is that something which
is possible?

I've been meaning to make a list of loops which always iterate at least
one time.  for_each_cpu() etc.

regards,
dan carpenter