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SubjectRe: [PATCH v2] hisi_lpc: Use acpi_dev_for_each_child()
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On 30/06/2022 13:48, Rafael J. Wysocki wrote:
> On Wed, Jun 29, 2022 at 3:47 PM Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
>>
>> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>
>> Instead of walking the list of children of an ACPI device directly,
>> use acpi_dev_for_each_child() to carry out an action for all of
>> the given ACPI device's children.
>>
>> This will help to eliminate the children list head from struct
>> acpi_device as it is redundant and it is used in questionable ways
>> in some places (in particular, locking is needed for walking the
>> list pointed to it safely, but it is often missing).
>
> I've overlooked another usage of the children list in hisi_lpc, in
> hisi_lpc_acpi_probe(), and eliminating that one is a bit more
> complicated.
>
> So please scratch this one and I will send a v3 when 0-day tells me
> that it builds.

Hi Rafael,

If it makes things simpler then I can just fix the driver so that we
can't unload it. Let me know if that suits better.

Cheers

>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>> Acked-by: John Garry <john.garry@huawei.com>
>> ---
>>
>> -> v2:
>> * Drop unused local variable (John).
>> * Add ACK from John.
>>
>> ---
>> drivers/bus/hisi_lpc.c | 14 ++++++++------
>> 1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> Index: linux-pm/drivers/bus/hisi_lpc.c
>> ===================================================================
>> --- linux-pm.orig/drivers/bus/hisi_lpc.c
>> +++ linux-pm/drivers/bus/hisi_lpc.c
>> @@ -471,6 +471,12 @@ static int hisi_lpc_acpi_remove_subdev(s
>> return 0;
>> }
>>
>> +static int hisi_lpc_acpi_clear_enumerated(struct acpi_device *adev, void *not_used)
>> +{
>> + acpi_device_clear_enumerated(adev);
>> + return 0;
>> +}
>> +
>> struct hisi_lpc_acpi_cell {
>> const char *hid;
>> const char *name;
>> @@ -480,13 +486,9 @@ struct hisi_lpc_acpi_cell {
>>
>> static void hisi_lpc_acpi_remove(struct device *hostdev)
>> {
>> - struct acpi_device *adev = ACPI_COMPANION(hostdev);
>> - struct acpi_device *child;
>> -
>> device_for_each_child(hostdev, NULL, hisi_lpc_acpi_remove_subdev);
>> -
>> - list_for_each_entry(child, &adev->children, node)
>> - acpi_device_clear_enumerated(child);
>> + acpi_dev_for_each_child(ACPI_COMPANION(hostdev),
>> + hisi_lpc_acpi_clear_enumerated, NULL);
>> }
>>
>> /*
>>
>>
>>
> .

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