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

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Date:	Mon, 07 Apr 2014 13:18:54 +0100
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Mike Looijmans <mike.looijmans@...ic.nl>,
	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 07/04/14 13:16, Ben Dooks wrote:
> On 07/04/14 13:09, Mike Looijmans wrote:
>> 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.
>
> Surely it needs to be changed to IS_ERR(), nor IS_ERR_OR_NULL()?


And by that, I mean the use of "PTR_ERR(host->vmmc) < 0" to be
changed to IS_ERR(), which I think Arnd was originally complaining
about.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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