linux-kernel - Re: [PATCH] spi: Add missing error handling for CS GPIOs

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Date:   Mon, 8 Apr 2019 13:12:44 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Mark Brown <broonie@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: Add missing error handling for CS GPIOs

On Wed, Apr 3, 2019 at 4:46 PM Geert Uytterhoeven
<geert+renesas@...der.be> wrote:

> While devm_gpiod_get_index_optional() returns NULL if the GPIO is not
> present (i.e. -ENOENT), it may still return other error codes, like
> -EPROBE_DEFER.  Currently these are not handled, leading to
> unrecoverable failures later in case of probe deferral:
>
>     gpiod_set_consumer_name: invalid GPIO (errorpointer)
>     gpiod_direction_output: invalid GPIO (errorpointer)
>     gpiod_set_value_cansleep: invalid GPIO (errorpointer)
>     gpiod_set_value_cansleep: invalid GPIO (errorpointer)
>     gpiod_set_value_cansleep: invalid GPIO (errorpointer)
>
> Detect and propagate errors to fix this.
>
> Fixes: f3186dd876697e69 ("spi: Optionally use GPIO descriptors for CS GPIOs")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Good catch! Sorry for my bugs...
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij