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

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Message-ID: <53429582.9010007@topic.nl>
Date:	Mon, 7 Apr 2014 14:09:38 +0200
From:	Mike Looijmans <mike.looijmans@...ic.nl>
To:	Arnd Bergmann <arnd@...db.de>
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 04/07/2014 10:11 AM, Arnd Bergmann wrote:
> 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.

Please make that a separate patch, because doing so will break most (if not 
all) boards using this controller.

Mike.


Met vriendelijke groet / kind regards,

Mike Looijmans

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