linux-kernel - Re: [PATCH v17 01/12] power: reset: reboot-mode: Remove devres based allocations

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Message-ID: <c3dc392c-eff3-199b-c047-7fabe155ae98@oss.qualcomm.com>
Date: Mon, 10 Nov 2025 18:50:02 +0530
From: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
To: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, Vinod Koul <vkoul@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        John Stultz <john.stultz@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Andre Draszik
 <andre.draszik@...aro.org>,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        Elliot Berman <quic_eberman@...cinc.com>,
        Xin Liu <xin.liu@....qualcomm.com>,
        Srinivas Kandagatla <srini@...nel.org>
Subject: Re: [PATCH v17 01/12] power: reset: reboot-mode: Remove devres based
 allocations



On 11/10/2025 6:31 PM, Mukesh Ojha wrote:
> On Sun, Nov 09, 2025 at 08:07:14PM +0530, Shivendra Pratap wrote:
>> Devres APIs are intended for use in drivers, and they should be
>> avoided in shared subsystem code which is being used by multiple
>> drivers. Avoid using devres based allocations in the reboot-mode
>> subsystem and manually free the resources.
>>
>> Replace devm_kzalloc with kzalloc and handle memory cleanup
>> explicitly.
>>
>> Fixes: 4fcd504edbf7 ("power: reset: add reboot mode driver")
>> Signed-off-by: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
>> ---
>>  drivers/power/reset/reboot-mode.c | 30 ++++++++++++++++++++----------
>>  1 file changed, 20 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
>> index fba53f638da04655e756b5f8b7d2d666d1379535..ac4223794083f36960b2bd37a601b7e1f1872de5 100644
>> --- a/drivers/power/reset/reboot-mode.c
>> +++ b/drivers/power/reset/reboot-mode.c
>> @@ -3,6 +3,8 @@
>>   * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
>>   */
>>  
>> +#define pr_fmt(fmt)	"reboot-mode: " fmt
>> +
>>  #include <linux/device.h>
>>  #include <linux/init.h>
>>  #include <linux/kernel.h>
>> @@ -71,6 +73,7 @@ static int reboot_mode_notify(struct notifier_block *this,
>>  int reboot_mode_register(struct reboot_mode_driver *reboot)
>>  {
>>  	struct mode_info *info;
>> +	struct mode_info *next;
>>  	struct property *prop;
>>  	struct device_node *np = reboot->dev->of_node;
>>  	size_t len = strlen(PREFIX);
>> @@ -82,29 +85,27 @@ int reboot_mode_register(struct reboot_mode_driver *reboot)
>>  		if (strncmp(prop->name, PREFIX, len))
>>  			continue;
>>  
>> -		info = devm_kzalloc(reboot->dev, sizeof(*info), GFP_KERNEL);
>> +		info = kzalloc(sizeof(*info), GFP_KERNEL);
>>  		if (!info) {
>>  			ret = -ENOMEM;
>>  			goto error;
>>  		}
>>  
>>  		if (of_property_read_u32(np, prop->name, &info->magic)) {
>> -			dev_err(reboot->dev, "reboot mode %s without magic number\n",
>> -				info->mode);
>> -			devm_kfree(reboot->dev, info);
>> +			pr_err("reboot mode %s without magic number\n", info->mode);
>> +			kfree(info);
> 
> This as well could be avoided if we move the above memory allocation
> after of_property_read_u32()

ok. Will re-order the code to avoid the kfree(info) here.

> 
>>  			continue;
>>  		}
>>  
>>  		info->mode = kstrdup_const(prop->name + len, GFP_KERNEL);
>>  		if (!info->mode) {
>>  			ret =  -ENOMEM;
>> -			goto error;
>> +			goto err_info;
>>  		} else if (info->mode[0] == '\0') {
>>  			kfree_const(info->mode);
>>  			ret = -EINVAL;
>> -			dev_err(reboot->dev, "invalid mode name(%s): too short!\n",
>> -				prop->name);
>> -			goto error;
>> +			pr_err("invalid mode name(%s): too short!\n", prop->name);
>> +			goto err_info;
>>  		}
>>  
>>  		list_add_tail(&info->list, &reboot->head);
>> @@ -115,9 +116,14 @@ int reboot_mode_register(struct reboot_mode_driver *reboot)
>>  
>>  	return 0;
>>  
>> +err_info:
> 
> free_info ?

Ack.

thanks,
Shivendra