Em Mon, 29 Sep 2014 20:03:34 +0200
Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> escreveu:
> Decrementing the reference count of the previous endpoint node allows to
> use the of_graph_get_next_endpoint function in a for_each_... style macro.
> All current users of this function that pass a non-NULL prev parameter
> (that is, soc_camera and imx-drm) are changed to not decrement the passed
> prev argument's refcount themselves.
>
> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Feel free to merge it via Grant's tree.
Acked-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
> ---
> Changes since v4:
> - Folded patches 1-3 into this one
> ---
> drivers/media/platform/soc_camera/soc_camera.c | 3 ++-
> drivers/of/base.c | 9 +--------
> drivers/staging/imx-drm/imx-drm-core.c | 12 ++----------
> 3 files changed, 5 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> index f4308fe..619b2d4 100644
> --- a/drivers/media/platform/soc_camera/soc_camera.c
> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> @@ -1696,7 +1696,6 @@ static void scan_of_host(struct soc_camera_host *ici)
> if (!i)
> soc_of_bind(ici, epn, ren->parent);
>
> - of_node_put(epn);
> of_node_put(ren);
>
> if (i) {
> @@ -1704,6 +1703,8 @@ static void scan_of_host(struct soc_camera_host *ici)
> break;
> }
> }
> +
> + of_node_put(epn);
> }
>
> #else
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 293ed4b..f7a9aa8 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2070,8 +2070,7 @@ EXPORT_SYMBOL(of_graph_parse_endpoint);
> * @prev: previous endpoint node, or NULL to get first
> *
> * Return: An 'endpoint' node pointer with refcount incremented. Refcount
> - * of the passed @prev node is not decremented, the caller have to use
> - * of_node_put() on it when done.
> + * of the passed @prev node is decremented.
> */
> struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
> struct device_node *prev)
> @@ -2107,12 +2106,6 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
> if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n",
> __func__, prev->full_name))
> return NULL;
> -
> - /*
> - * Avoid dropping prev node refcount to 0 when getting the next
> - * child below.
> - */
> - of_node_get(prev);
> }
>
> while (1) {
> diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
> index 6b22106..12303b3 100644
> --- a/drivers/staging/imx-drm/imx-drm-core.c
> +++ b/drivers/staging/imx-drm/imx-drm-core.c
> @@ -434,14 +434,6 @@ static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
> return 0;
> }
>
> -static struct device_node *imx_drm_of_get_next_endpoint(
> - const struct device_node *parent, struct device_node *prev)
> -{
> - struct device_node *node = of_graph_get_next_endpoint(parent, prev);
> - of_node_put(prev);
> - return node;
> -}
> -
> int imx_drm_encoder_parse_of(struct drm_device *drm,
> struct drm_encoder *encoder, struct device_node *np)
> {
> @@ -453,7 +445,7 @@ int imx_drm_encoder_parse_of(struct drm_device *drm,
> for (i = 0; ; i++) {
> u32 mask;
>
> - ep = imx_drm_of_get_next_endpoint(np, ep);
> + ep = of_graph_get_next_endpoint(np, ep);
> if (!ep)
> break;
>
> @@ -502,7 +494,7 @@ int imx_drm_encoder_get_mux_id(struct device_node *node,
> return -EINVAL;
>
> do {
> - ep = imx_drm_of_get_next_endpoint(node, ep);
> + ep = of_graph_get_next_endpoint(node, ep);
> if (!ep)
> break;
>
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