linux-kernel - Re: [PATCH v3 1/6] ACPI: scan: Extend acpi_walk_dep_device

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Date:   Mon, 8 Mar 2021 20:40:26 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Tomasz Figa <tfiga@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Mani, Rajmohan" <rajmohan.mani@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        andy.shevchenko@...ux.intel.com,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>, me@...wu.ch,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>
Subject: Re: [PATCH v3 1/6] ACPI: scan: Extend acpi_walk_dep_device_list()

Hi Rafael

On 08/03/2021 17:46, Rafael J. Wysocki wrote:
>> +void acpi_walk_dep_device_list(acpi_handle handle,
>> +                              int (*callback)(struct acpi_dep_data *, void *),
>> +                              void *data)
>> +{
>> +       struct acpi_dep_data *dep, *tmp;
>> +       int ret;
>> +
>>         mutex_lock(&acpi_dep_list_lock);
>>         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
>>                 if (dep->supplier == handle) {
>> -                       acpi_bus_get_device(dep->consumer, &adev);
>> -                       if (!adev)
>> -                               continue;
>> -
>> -                       adev->dep_unmet--;
>> -                       if (!adev->dep_unmet)
>> -                               acpi_bus_attach(adev, true);
> The above code in the mainline has changed recently, so you need to
> rebase the above and adjust for the change of behavior.


Yeah, I'll rebase onto 5.12-rc2 before next submission.

>
>> -
>> -                       list_del(&dep->node);
>> -                       kfree(dep);
>> +                       ret = callback(dep, data);
>> +                       if (ret)
>> +                               break;
>>                 }
>>         }
>>         mutex_unlock(&acpi_dep_list_lock);
>>  }
>>  EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
>>
>> +/**
>> + * acpi_dev_flag_dependency_met() - Inform consumers of @handle that the device
>> + *                                 is now active
> No parens here, please, and make it fit one line.
>
> Also the description should be something like "Clear dependencies on
> the given device."


OK - no problem