lkml.org 
[lkml]   [2014]   [Apr]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/4] mmc: sdhci: defer probing on regulator_get_optional() failures
On 04/14/2014 07:42 PM, Andrew Bresticker wrote:
> If regulator_get_optional() returns EPROBE_DEFER, it indicates
> that the regulator may show up later (e.g. the DT property is
> present but the corresponding regulator may not have probed).
> Instead of continuing without the regulator, return EPROBE_DEFER
> from sdhci_add_host(). Also, fix regulator leaks in the error
> paths in sdhci_add_host().

> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c

> if (IS_ERR_OR_NULL(host->vqmmc)) {

This is a pre-existing condition, but ick: Why doesn't this test either
IS_ERR() /or/ == NULL, but not both. On error, the regulator API should
either return and error-point or return NULL, so that client code
shouldn't need to check for both.

> +put_vmmc:
> + if (host->vmmc)
> + regulator_put(host->vmmc);
> +put_vqmmc:
> + if (host->vqmmc)
> + regulator_put(host->vqmmc);

If IS_ERR_OR_NULL() really is required above, it should be used here
too. More likely, I hope you need to replace if (host->vmmc) with if
(!IS_ERR(host->vmmc)).

I wonder if fixing this would help solve the crashes that Alex saw?


\
 
 \ /
  Last update: 2014-04-15 20:41    [W:0.140 / U:41.784 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site