Re: [PATCH] gpio: generic: clamp values from bgpio_get_set()

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Dec 11, 2015 at 10:47 PM, Fabio Estevam <festevam@xxxxxxxxx> wrote:
> On Fri, Dec 11, 2015 at 7:36 PM, Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
>> The bgpio_get_set() call should return a value clamped to [0,1],
>> the current code will return a negative value if reading
>> bit 31, which turns the value negative as this is a signed value
>> and thus gets interpreted as an error by the gpiolib core.
>> Found on the gpio-mxc but applies to any MMIO driver.
>>
>> Fixes: b19e7f51a55f "gpio: gpio-generic: add flag to read out output value from reg_set"
>
> This commit appeared in 4.2, so it would be nice to add a stable tag:
>
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.2+

IIUC Fixes: has exactly this effect: it will be applied to any kernel where
that commit is present. The beauty of git commit hashes.

Yours,
Linus Walleij
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