| Message ID | 20210920074405.252477-1-u.kleine-koenig@pengutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] hwrng: meson - Improve error handling for core clock | expand |
On 20/09/2021 09:44, Uwe Kleine-König wrote: > -ENOENT (ie. "there is no clock") is fine to ignore for an optional > clock, other values are not supposed to be ignored and should be > escalated to the caller (e.g. -EPROBE_DEFER). Ignore -ENOENT by using > devm_clk_get_optional(). > > While touching this code also add an error message for the fatal errors. > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> > --- > Hello, > > compared to (implicit) v1 > (https://lore.kernel.org/r/20210914142428.57099-1-u.kleine-koenig@pengutronix.de) > this used dev_err_probe() as suggested by Martin Blumenstingl. > > v1 got a "Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>", I didn't add > that because of the above change. > Hopefully martin did a better review than me ! Anyway, Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Neil > (Hmm, my setup is broken, the b4 patch signature was done before I added this > message. I wonder if this will break the signature ...) > > Best regards > Uwe > > drivers/char/hw_random/meson-rng.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c > index e446236e81f2..8bb30282ca46 100644 > --- a/drivers/char/hw_random/meson-rng.c > +++ b/drivers/char/hw_random/meson-rng.c > @@ -54,9 +54,10 @@ static int meson_rng_probe(struct platform_device *pdev) > if (IS_ERR(data->base)) > return PTR_ERR(data->base); > > - data->core_clk = devm_clk_get(dev, "core"); > + data->core_clk = devm_clk_get_optional(dev, "core"); > if (IS_ERR(data->core_clk)) > - data->core_clk = NULL; > + return dev_err_probe(dev, PTR_ERR(data->core_clk), > + "Failed to get core clock\n"); > > if (data->core_clk) { > ret = clk_prepare_enable(data->core_clk); > > base-commit: 7d2a07b769330c34b4deabeed939325c77a7ec2f >
On Mon, Sep 20, 2021 at 9:44 AM Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote: > > -ENOENT (ie. "there is no clock") is fine to ignore for an optional > clock, other values are not supposed to be ignored and should be > escalated to the caller (e.g. -EPROBE_DEFER). Ignore -ENOENT by using > devm_clk_get_optional(). > > While touching this code also add an error message for the fatal errors. > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> as well as: Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> # on Odroid-C1 Thank you Uwe! Best regards, Martin
On Mon, Sep 20, 2021 at 09:44:05AM +0200, Uwe Kleine-König wrote: > -ENOENT (ie. "there is no clock") is fine to ignore for an optional > clock, other values are not supposed to be ignored and should be > escalated to the caller (e.g. -EPROBE_DEFER). Ignore -ENOENT by using > devm_clk_get_optional(). > > While touching this code also add an error message for the fatal errors. > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> > --- > Hello, > > compared to (implicit) v1 > (https://lore.kernel.org/r/20210914142428.57099-1-u.kleine-koenig@pengutronix.de) > this used dev_err_probe() as suggested by Martin Blumenstingl. > > v1 got a "Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>", I didn't add > that because of the above change. > > (Hmm, my setup is broken, the b4 patch signature was done before I added this > message. I wonder if this will break the signature ...) > > Best regards > Uwe > > drivers/char/hw_random/meson-rng.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) Patch applied. Thanks.
diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c index e446236e81f2..8bb30282ca46 100644 --- a/drivers/char/hw_random/meson-rng.c +++ b/drivers/char/hw_random/meson-rng.c @@ -54,9 +54,10 @@ static int meson_rng_probe(struct platform_device *pdev) if (IS_ERR(data->base)) return PTR_ERR(data->base); - data->core_clk = devm_clk_get(dev, "core"); + data->core_clk = devm_clk_get_optional(dev, "core"); if (IS_ERR(data->core_clk)) - data->core_clk = NULL; + return dev_err_probe(dev, PTR_ERR(data->core_clk), + "Failed to get core clock\n"); if (data->core_clk) { ret = clk_prepare_enable(data->core_clk);
-ENOENT (ie. "there is no clock") is fine to ignore for an optional clock, other values are not supposed to be ignored and should be escalated to the caller (e.g. -EPROBE_DEFER). Ignore -ENOENT by using devm_clk_get_optional(). While touching this code also add an error message for the fatal errors. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> --- Hello, compared to (implicit) v1 (https://lore.kernel.org/r/20210914142428.57099-1-u.kleine-koenig@pengutronix.de) this used dev_err_probe() as suggested by Martin Blumenstingl. v1 got a "Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>", I didn't add that because of the above change. (Hmm, my setup is broken, the b4 patch signature was done before I added this message. I wonder if this will break the signature ...) Best regards Uwe drivers/char/hw_random/meson-rng.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) base-commit: 7d2a07b769330c34b4deabeed939325c77a7ec2f