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SubjectRe: [PATCH 1/2] Use kacpi_hotplug_wq to handle container hotplug event.
On 10/25/2012 01:33 AM, Toshi Kani wrote:
> On Tue, 2012-10-23 at 21:10 +0800, Tang Chen wrote:
>> As the comments in __acpi_os_execute() said:
>>
>> We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
>> because the hotplug code may call driver .remove() functions,
>> which invoke flush_scheduled_work/acpi_os_wait_events_complete
>> to flush these workqueues.
>>
>> we should keep the hotplug code in kacpi_hotplug_wq.
>>
>> But we have the following call series in kernel now:
>> acpi_ev_queue_notify_request()
>> |--> acpi_os_execute()
>> |--> __acpi_os_execute(type, function, context, 0)
>>
>> The last parameter 0 makes the container_notify_cb() executed in
>> kacpi_notify_wq or kacpid_wq. So, we need to put the real hotplug code
>> into kacpi_hotplug_wq.
>
> Hi Tang,
>
> I am curious; is there a particular reason why you use
> alloc_acpi_container_hp_work() instead of acpi_os_hotplug_execute(),
> which is already there in the tree?

Hi Toshi,

Thanks for telling me this. I didn't realize this function. :)
And yes, it is better.

Thanks. :)

>
> Thanks,
> -Toshi
>
>
>> Signed-off-by: Tang Chen<tangchen@cn.fujitsu.com>
>> ---
>> drivers/acpi/container.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
>> 1 files changed, 43 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
>> index 1f9f7d7..643657a 100644
>> --- a/drivers/acpi/container.c
>> +++ b/drivers/acpi/container.c
>> @@ -72,8 +72,36 @@ static struct acpi_driver acpi_container_driver = {
>> },
>> };
>>
>> +struct acpi_container_hp_work {
>> + struct work_struct work;
>> + acpi_handle handle;
>> + u32 type;
>> + void *context;
>> +};
>> +
>> /*******************************************************************/
>>
>> +static void alloc_acpi_container_hp_work(acpi_handle handle, u32 type,
>> + void *context,
>> + void (*func)(struct work_struct *work))
>> +{
>> + struct acpi_container_hp_work *hp_work;
>> + int ret;
>> +
>> + hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
>> + if (!hp_work)
>> + return;
>> +
>> + hp_work->handle = handle;
>> + hp_work->type = type;
>> + hp_work->context = context;
>> +
>> + INIT_WORK(&hp_work->work, func);
>> + ret = queue_work(kacpi_hotplug_wq,&hp_work->work);
>> + if (!ret)
>> + kfree(hp_work);
>> +}
>> +
>> static int is_device_present(acpi_handle handle)
>> {
>> acpi_handle temp;
>> @@ -152,14 +180,21 @@ static int container_device_add(struct acpi_device **device, acpi_handle handle)
>> return result;
>> }
>>
>> -static void container_notify_cb(acpi_handle handle, u32 type, void *context)
>> +static void __container_notify_cb(struct work_struct *work)
>> {
>> struct acpi_device *device = NULL;
>> int result;
>> int present;
>> acpi_status status;
>> + struct acpi_container_hp_work *hp_work;
>> + acpi_handle handle;
>> + u32 type;
>> u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
>>
>> + hp_work = container_of(work, struct acpi_container_hp_work, work);
>> + handle = hp_work->handle;
>> + type = hp_work->type;
>> +
>> switch (type) {
>> case ACPI_NOTIFY_BUS_CHECK:
>> /* Fall through */
>> @@ -211,6 +246,13 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
>> return;
>> }
>>
>> +static void container_notify_cb(acpi_handle handle, u32 type,
>> + void *context)
>> +{
>> + alloc_acpi_container_hp_work(handle, type, context,
>> + __container_notify_cb);
>> +}
>> +
>> static acpi_status
>> container_walk_namespace_cb(acpi_handle handle,
>> u32 lvl, void *context, void **rv)
>
>
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