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SubjectRe: [PATCH] driver: base: pinctrl: return error from pinctrl_bind_pins()
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On Tuesday 13 September 2016 05:29 PM, Linus Walleij wrote:
> On Tue, Sep 13, 2016 at 9:13 AM, Deepak <deepak_das@mentor.com> wrote:
>
>> strict pin controller returns -EINVAL in case of pin request which
>> is already claimed by somebody else.
>> Following is the sequence of calling pin_request() from
>> pinctrl_bind_pins():-
>> pinctrl_bind_pins()->pinctrl_select_state()->pinmux_enable_setting()->
>> pin_request()
>>
>> But pinctrl_bind_pins() only returns -EPROBE_DEFER which makes device
>> driver probe successful even if the pin request is rejected by the pin
>> controller subsystem.
>>
>> This commit modifies pinctrl_bind_pins() to return error if the pin is
>> rejected by pin control subsystem.
>>
>> Signed-off-by: Deepak Das <deepak_das@mentor.com>
>
> Aha
>
>> /* Only return deferrals */
>> - if (ret != -EPROBE_DEFER)
>> + if ((ret != -EPROBE_DEFER) && (ret != -EINVAL))
>> ret = 0;
>
> I rewrote this when applying, like this:
>
> - /* Only return deferrals */
> - if (ret != -EPROBE_DEFER)
> - ret = 0;
> + /* Return deferrals */
> + if (ret == -EPROBE_DEFER)
> + return ret;
> + if (ret == -EINVAL) {
> + dev_err(dev, "could not initialize pin control state\n");
> + return ret;
> + }
> + /* We ignore errors like -ENOENT meaning no pinctrl state */
>
> - return ret;
> + return 0;
>
> Can you confim that this works for you too?

Yes, This works for me as well but do we really need this extra error
message ?
error message is printed before returning -EINVAL from most places,
Although I did not checked all places. For example, error message in
pin_request():-
dev_err(pctldev->dev, "pin %s already requested by %s; cannot claim for
%s\n", desc->name, desc->mux_owner, owner);

Thanks,
Deepak Das
>
> Yours,
> Linus Walleij
>

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