linux-kernel - Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Date: Wed, 24 Apr 2024 06:31:26 -0700
From: Wren Turkal <wt@...guintechs.org>
To: quic_zijuhu <quic_zijuhu@...cinc.com>,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Marcel Holtmann
 <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL
 returned by gpiod_get_optional()

On 4/24/24 6:22 AM, quic_zijuhu wrote:
> On 4/24/2024 9:18 PM, Bartosz Golaszewski wrote:
>> On Wed, 24 Apr 2024 at 15:10, Wren Turkal <wt@...guintechs.org> wrote:
>>>
>>> On 4/24/24 5:29 AM, Bartosz Golaszewski wrote:
>>>> From: Bartosz Golaszewski<bartosz.golaszewski@...aro.org>
>>>>
>>>> Any return value from gpiod_get_optional() other than a pointer to a
>>>> GPIO descriptor or a NULL-pointer is an error and the driver should
>>>> abort probing. That being said: commit 56d074d26c58 ("Bluetooth: hci_qca:
>>>> don't use IS_ERR_OR_NULL() with gpiod_get_optional()") no longer sets
>>>> power_ctrl_enabled on NULL-pointer returned by
>>>> devm_gpiod_get_optional(). Restore this behavior but bail-out on errors.
>>>> While at it: also bail-out on error returned when trying to get the
>>>> "swctrl" GPIO.
>>>>
>>>> Reported-by: Wren Turkal<wt@...guintechs.org>
>>>> Reported-by: Zijun Hu<quic_zijuhu@...cinc.com>
>>>> Closes:https://lore.kernel.org/linux-bluetooth/1713449192-25926-2-git-send-email-quic_zijuhu@quicinc.com/
>>>> Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()")
>>>> Reviewed-by: Krzysztof Kozlowski<krzysztof.kozlowski@...aro.org>
>>>> Signed-off-by: Bartosz Golaszewski<bartosz.golaszewski@...aro.org>
>>>
>>> Tested-by: "Wren Turkal" <wt@...guintechs.org>
>>>
>>>
>>> Like this?
>>
>> Yes, awesome, thanks.
>>
>> This is how reviewing works too in the kernel, look at what Krzysztof
>> did under v1, he just wrote:
>>
>> Reviewed-by: Krzysztof Kozlowski<krzysztof.kozlowski@...aro.org>
>>
> v1 have obvious something wrong as i pointed and verified.
> so i think it is not suitable to attach v1's review-by tag to v2 anyway.

@Zijun, your concern is that current DTs may not define the gpio and 
this will cause the bluetooth not to work?

Would that not more appropriately be fixed by machine-specific fixups 
for the DT?

> 
>> And mailing list tools will pick it up.
>>
>> Bartosz
> 

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