linux-kernel - Re: [PATCH] soc: qcom: pmic: Fix resource leaks in device_for_each_child

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Message-ID: <90e94292-4300-e7f0-1a37-72a5c3bd77dc@kernel.org>
Date:   Wed, 31 May 2023 14:19:40 +0200
From:   Konrad Dybcio <konradybcio@...nel.org>
To:     路红飞 <luhongfei@...o.com>,
        "konradybcio@...nel.org" <konradybcio@...nel.org>,
        "agross@...nel.org" <agross@...nel.org>,
        "andersson@...nel.org" <andersson@...nel.org>,
        "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "opensource.kernel" <opensource.kernel@...o.com>
Subject: Re: [PATCH] soc: qcom: pmic: Fix resource leaks in
 device_for_each_child_node() loops



On 31.05.2023 12:40, 路红飞 wrote:
> 
> On 2023/5/31 17:03, Konrad Dybcio wrote:>
>> On 31.05.2023 10:54, Lu Hongfei wrote:
>>> The device_for_each_child_node loop in pmic_glink_altmode_probe should have
>>> fwnode_handle_put() before return which could avoid resource leaks.
>>> This patch could fix this bug.
>>>
>>> Fixes: 080b4e24852b ("soc: qcom: pmic_glink: Introduce altmode support")
>>>
>>> Signed-off-by: Lu Hongfei <luhongfei@...o.com>
>>> ---
>> This is the third revision of this patch, please version them accordingly.
>>
>> You can pass `-vN` to git format-patch and it'll do the job for you.
>>
>> Please also describe the changes since last revision below the --- line.
>>
>> Konrad
> The latter two versions have added Fixes: tag, without any changes to the
> 
> specific content of this patch.
The commit message is an integral part of the patch, it's not only the 
diff that matters. Any change deserves a new revision number, unless you
made a mistake when sending the emails (e.g. you didn't fill out the To:
and Cc: fields properly), in which case you should use the [RESEND PATCH] tag.

> 
> Just use the third version of this patch.
Which I have to dig up by hand from the tens of patches I've received
since, because you did not specify which one is the third version
in the title. This also messes with patch workflow tools like b4.

Konrad
> 
> Thanks.
> 
> Lu Hongfei
> 
>>>   drivers/soc/qcom/pmic_glink_altmode.c | 27 ++++++++++++++++++---------
>>>   1 file changed, 18 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c
>>> index df48fbea4b68..a7fc6570fa1e
>>> --- a/drivers/soc/qcom/pmic_glink_altmode.c
>>> +++ b/drivers/soc/qcom/pmic_glink_altmode.c
>>> @@ -395,7 +395,7 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>>>   		ret = fwnode_property_read_u32(fwnode, "reg", &port);
>>>   		if (ret < 0) {
>>>   			dev_err(dev, "missing reg property of %pOFn\n", fwnode);
>>> -			return ret;
>>> +			goto err_node_put;
>>>   		}
>>>   
>>>   		if (port >= ARRAY_SIZE(altmode->ports)) {
>>> @@ -405,7 +405,8 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>>>   
>>>   		if (altmode->ports[port].altmode) {
>>>   			dev_err(dev, "multiple connector definition for port %u\n", port);
>>> -			return -EINVAL;
>>> +			ret = -EINVAL;
>>> +			goto err_node_put;
>>>   		}
>>>   
>>>   		alt_port = &altmode->ports[port];
>>> @@ -420,33 +421,37 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>>>   
>>>   		ret = devm_drm_bridge_add(dev, &alt_port->bridge);
>>>   		if (ret)
>>> -			return ret;
>>> +			goto err_node_put;
>>>   
>>>   		alt_port->dp_alt.svid = USB_TYPEC_DP_SID;
>>>   		alt_port->dp_alt.mode = USB_TYPEC_DP_MODE;
>>>   		alt_port->dp_alt.active = 1;
>>>   
>>>   		alt_port->typec_mux = fwnode_typec_mux_get(fwnode);
>>> -		if (IS_ERR(alt_port->typec_mux))
>>> -			return dev_err_probe(dev, PTR_ERR(alt_port->typec_mux),
>>> +		if (IS_ERR(alt_port->typec_mux)) {
>>> +			ret = dev_err_probe(dev, PTR_ERR(alt_port->typec_mux),
>>>   					     "failed to acquire mode-switch for port: %d\n",
>>>   					     port);
>>> +			goto err_node_put;
>>> +		}
>>>   
>>>   		ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_mux,
>>>   					       alt_port->typec_mux);
>>>   		if (ret)
>>> -			return ret;
>>> +			goto err_node_put;
>>>   
>>>   		alt_port->typec_switch = fwnode_typec_switch_get(fwnode);
>>> -		if (IS_ERR(alt_port->typec_switch))
>>> -			return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),
>>> +		if (IS_ERR(alt_port->typec_switch)) {
>>> +			ret = dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),
>>>   					     "failed to acquire orientation-switch for port: %d\n",
>>>   					     port);
>>> +			goto err_node_put;
>>> +		}
>>>   
>>>   		ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_switch,
>>>   					       alt_port->typec_switch);
>>>   		if (ret)
>>> -			return ret;
>>> +			goto err_node_put;
>>>   	}
>>>   
>>>   	altmode->client = devm_pmic_glink_register_client(dev,
>>> @@ -455,6 +460,10 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>>>   							  pmic_glink_altmode_pdr_notify,
>>>   							  altmode);
>>>   	return PTR_ERR_OR_ZERO(altmode->client);
>>> +
>>> +err_node_put:
>>> +	fwnode_handle_put(fwnode);
>>> +	return ret;
>>>   }
>>>   
>>>   static const struct auxiliary_device_id pmic_glink_altmode_id_table[] = {