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SubjectRe: [PATCH v16 09/10] drm/panel: Use of_find_backlight helper
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Den 16.01.2018 11.36, skrev Meghana Madhyastha:
> Replace of_find_backlight_by_node and of the code around it
> with of_find_backlight helper to avoid repetition of code.
>
> Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
> ---
> drivers/gpu/drm/panel/panel-innolux-p079zca.c | 10 +++-------
> drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c | 10 +++-------
> drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c | 10 +++-------
> 3 files changed, 9 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
> index 4c1b29eec..a69b0530f 100644
> --- a/drivers/gpu/drm/panel/panel-innolux-p079zca.c
> +++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
> @@ -230,14 +230,10 @@ static int innolux_panel_add(struct innolux_panel *innolux)
> innolux->enable_gpio = NULL;
> }
>
> - np = of_parse_phandle(dev->of_node, "backlight", 0);
> - if (np) {
> - innolux->backlight = of_find_backlight_by_node(np);
> - of_node_put(np);
> + innolux->backlight = devm_of_find_backlight(np);

This driver isn't broken like tinydrm was, so it does put the backlight
device on cleanup like it should. So when you're using the devm_ version,
the result is a double put. Just remove the put_device() in
innolux_panel_add/del() and you're good.

I haven't checked the other drivers.

Noralf.

PS:
Give people a few days (one week?) to respond before respinning a new
version, so we avoid a fragmented discussion.

>
> - if (!innolux->backlight)
> - return -EPROBE_DEFER;
> - }
> + if (IS_ERR(innolux->backlight))
> + return PTR_ERR(innolux->backlight);
>
> drm_panel_init(&innolux->base);
> innolux->base.funcs = &innolux_panel_funcs;
> diff --git a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
> index 1512ec4f3..d5450c9d9 100644
> --- a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
> +++ b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
> @@ -329,14 +329,10 @@ static int sharp_panel_add(struct sharp_panel *sharp)
> if (IS_ERR(sharp->supply))
> return PTR_ERR(sharp->supply);
>
> - np = of_parse_phandle(sharp->link1->dev.of_node, "backlight", 0);
> - if (np) {
> - sharp->backlight = of_find_backlight_by_node(np);
> - of_node_put(np);
> + sharp->backlight = devm_of_find_backlight(np);
>
> - if (!sharp->backlight)
> - return -EPROBE_DEFER;
> - }
> + if (IS_ERR(sharp->backlight))
> + return PTR_ERR(sharp->backlight);
>
> drm_panel_init(&sharp->base);
> sharp->base.funcs = &sharp_panel_funcs;
> diff --git a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
> index a6af3257f..db31d8268 100644
> --- a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
> +++ b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
> @@ -273,14 +273,10 @@ static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
> gpiod_set_value(sharp_nt->reset_gpio, 0);
> }
>
> - np = of_parse_phandle(dev->of_node, "backlight", 0);
> - if (np) {
> - sharp_nt->backlight = of_find_backlight_by_node(np);
> - of_node_put(np);
> + sharp_nt->backlight = devm_of_find_backlight(np);
>
> - if (!sharp_nt->backlight)
> - return -EPROBE_DEFER;
> - }
> + if (IS_ERR(sharp_nt->backlight))
> + return PTR_ERR(sharp_nt->backlight);
>
> drm_panel_init(&sharp_nt->base);
> sharp_nt->base.funcs = &sharp_nt_panel_funcs;

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