On Wednesday, April 04, 2012 9:43 AM, H Hartley Sweeten wrote:
> On Wednesday, April 04, 2012 9:20 AM, H Hartley Sweeten wrote:
>> On Wednesday, April 04, 2012 1:41 AM, Rafal Prylowski wrote:
>>> On 2012-04-03 19:41, H Hartley Sweeten wrote:
>>> [not related to my patch, but ep93xx keypad]:
>>> Isn't ep93xx_keypad_acquire_gpio be more correct if we apply the following patch:
>>>
>>> Index: linux-2.6/arch/arm/mach-ep93xx/core.c
>>> ===================================================================
>>> --- linux-2.6.orig/arch/arm/mach-ep93xx/core.c
>>> +++ linux-2.6/arch/arm/mach-ep93xx/core.c
>>> @@ -734,7 +734,7 @@ int ep93xx_keypad_acquire_gpio(struct pl
>>> fail_gpio_d:
>>> gpio_free(EP93XX_GPIO_LINE_C(i));
>>> fail_gpio_c:
>>> - for ( ; i >= 0; --i) {
>>> + for (--i; i >= 0; --i) {
>>> gpio_free(EP93XX_GPIO_LINE_C(i));
>>> gpio_free(EP93XX_GPIO_LINE_D(i));
>>> }
>>>
>>> This way we don't double free EP93XX_GPIO_LINE_C(i), and don't free lines which were not
>>> successfully acquired (I noticed this when writing my patch, which is based on
>>> ep93xx_keypad_acquire/release_gpio).
>>
>> You are correct... ;-)
>>
>> Care to submit an actual patch?
>
> Note, if/when the devm_gpio_request patch gets into the kernel tree we can use
> that and get rid of the gpio_free's completely.
>
> Sorry, I don't have a link to that patch...
I just pulled linux-next. It looks like the devm_gpio_* stuff is now in.
commit 1a0703ede4493bd74f9c6b53f782b749e175a88e
Author: John Crispin <blogic@xxxxxxxxxxx>
Date: Tue Dec 20 21:40:21 2011 +0100
GPIO: add bindings for managed devices
This patch adds 2 functions that allow managed devices to request GPIOs.
These GPIOs will then be managed by drivers/base/devres.c.
Signed-off-by: John Crispin <blogic@xxxxxxxxxxx>
Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
Regards,
Hartley
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