On Wed, Jun 24, 2020 at 01:41:23PM +0200, Andrzej Hajda wrote:
> During probe every time driver gets resource it should usually check for error
> printk some message if it is not -EPROBE_DEFER and return the error. This
> pattern is simple but requires adding few lines after any resource acquisition
> code, as a result it is often omited or implemented only partially.
> probe_err helps to replace such code sequences with simple call, so code:
> if (err != -EPROBE_DEFER)
> dev_err(dev, ...);
> return err;
> becomes:
> return probe_err(dev, err, ...);
>
> Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
> Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
> Reviewed-by: Mark Brown <broonie@xxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> ---
> drivers/base/core.c | 39 +++++++++++++++++++++++++++++++++++++++
> include/linux/device.h | 3 +++
> 2 files changed, 42 insertions(+)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 67d39a90b45c..ee9da66bff1b 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3953,6 +3953,45 @@ define_dev_printk_level(_dev_info, KERN_INFO);
>
> #endif
>
> +/**
> + * probe_err - probe error check and log helper
> + * @dev: the pointer to the struct device
> + * @err: error value to test
> + * @fmt: printf-style format string
> + * @...: arguments as specified in the format string
> + *
> + * This helper implements common pattern present in probe functions for error
> + * checking: print message if the error is not -EPROBE_DEFER and propagate it.
> + * It replaces code sequence:
> + * if (err != -EPROBE_DEFER)
> + * dev_err(dev, ...);
> + * return err;
> + * with
> + * return probe_err(dev, err, ...);
> + *
> + * Returns @err.
> + *
> + */
> +int probe_err(const struct device *dev, int err, const char *fmt, ...)
> +{
> + struct va_format vaf;
> + va_list args;
> +
> + if (err == -EPROBE_DEFER)
> + return err;
> +
> + va_start(args, fmt);
> + vaf.fmt = fmt;
> + vaf.va = &args;
> +
> + dev_err(dev, "error %d: %pV", err, &vaf);
> +
> + va_end(args);
> +
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(probe_err);
Please be specific in global symbols, how about "driver_probe_error()"?
And merge the other patch into this one, as Raphael said, otherwise this
just looks odd to add something and then fix it up later.
thanks,
greg k-h
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