Nagging free/reclaim gpio's

Nagging free/reclaim gpio's

[Philip Balister]

I've got a module that claims gpio's when it is loaded and frees them 
when it is unloaded. It looks like something goes wrong when I free them:

gpio_unexport: gpio144 status -22
gpio_unexport: gpio146 status -22
gpio_unexport: gpio14 status -22
gpio_unexport: gpio21 status -22
gpio_unexport: gpio22 status -22
gpio_unexport: gpio23 status -22


Then when I try to reclaim them I get this:

gpio_request: gpio-175 (sysfs) status -16
export_store: status -16
gpio_request: gpio-175 (sysfs) status -16
export_store: status -16
gpio_request: gpio-114 (sysfs) status -16
export_store: status -16
gpio_request: gpio-114 (sysfs) status -16
export_store: status -16
gpio_request: gpio-173 (sysfs) status -16
export_store: status -16
gpio_request: gpio-173 (sysfs) status -16
export_store: status -16


This has to be silly, but I can't find the problem. Everything works 
fine, I just would like the messages to go away :)

Philip

Re: Nagging free/reclaim gpio's

[Felipe Balbi]

Hi,

On Mon, 30 Aug 2010 14:25:39 -0400, Philip Balister <philip@balister.org>
wrote:
> I've got a module that claims gpio's when it is loaded and frees them 
> when it is unloaded. It looks like something goes wrong when I free
them:
> 
> gpio_unexport: gpio144 status -22
> gpio_unexport: gpio146 status -22
> gpio_unexport: gpio14 status -22
> gpio_unexport: gpio21 status -22
> gpio_unexport: gpio22 status -22
> gpio_unexport: gpio23 status -22

this is telling you, you have entered invalid
arguments to gpio_unexport.

> Then when I try to reclaim them I get this:
> 
> gpio_request: gpio-175 (sysfs) status -16
> export_store: status -16
> gpio_request: gpio-175 (sysfs) status -16
> export_store: status -16
> gpio_request: gpio-114 (sysfs) status -16
> export_store: status -16
> gpio_request: gpio-114 (sysfs) status -16
> export_store: status -16
> gpio_request: gpio-173 (sysfs) status -16
> export_store: status -16
> gpio_request: gpio-173 (sysfs) status -16
> export_store: status -16
> 
> 
> This has to be silly, but I can't find the problem. Everything works 
> fine, I just would like the messages to go away :)

it's telling you that the gpio is busy, claimed by sysfs usage,
so you can't claim it again.

-- 
balbi

Re: Nagging free/reclaim gpio's

[Felipe Balbi]

Hi,

On Mon, 30 Aug 2010 15:48:59 -0400, Philip Balister <philip@balister.org>
wrote:
>> this is telling you, you have entered invalid
>> arguments to gpio_unexport.
> 
> I'm calling gpio_free, it must then be calling gpio_unexport for me ...

yes, but please always keep the list in Cc.

-- 
balbi