linux-kernel - Re: [PATCH] sdhci: Forward EPROBE_DEFER on vmmc and vqmmc regulators

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Date:	Mon, 07 Apr 2014 10:11:20 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Mike Looijmans <mike.looijmans@...ic.nl>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	cjb@...top.org, gdjakov@...sol.com
Subject: Re: [PATCH] sdhci: Forward EPROBE_DEFER on vmmc and vqmmc regulators

On Monday 07 April 2014 08:38:28 Mike Looijmans wrote:
> index 34aef81..43b90c1 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2972,6 +2972,8 @@ int sdhci_add_host(struct sdhci_host *host)
>         host->vqmmc = regulator_get_optional(mmc_dev(mmc), "vqmmc");
>         if (IS_ERR_OR_NULL(host->vqmmc)) {
>                 if (PTR_ERR(host->vqmmc) < 0) {
> +                       if (PTR_ERR(host->vqmmc) == -EPROBE_DEFER)
> +                               return -EPROBE_DEFER;
>                         pr_info("%s: no vqmmc regulator found\n",
>                                 mmc_hostname(mmc));
>                         host->vqmmc = NULL;
> @@ -3048,8 +3050,10 @@ int sdhci_add_host(struct sdhci_host *host)
>         host->vmmc = regulator_get_optional(mmc_dev(mmc), "vmmc");
>         if (IS_ERR_OR_NULL(host->vmmc)) {
>                 if (PTR_ERR(host->vmmc) < 0) {
> -                       pr_info("%s: no vmmc regulator found\n",
> -                               mmc_hostname(mmc));
> +                       if (PTR_ERR(host->vmmc) == -EPROBE_DEFER)
> +                               return -EPROBE_DEFER;
> +                       pr_info("%s: no vmmc regulator found (%d)\n",
> +                               mmc_hostname(mmc), PTR_ERR(host->vmmc));
>                         host->vmmc = NULL;
>                 }

Please change the code to not use IS_ERR_OR_NULL() instead, getting
a NULL return value from regulator_get_optional() should not be
considered a bug, while getting an error return should always
cause the probe function to fail.

	Arnd
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