Messages in this thread | | | Date | Thu, 25 Oct 2012 09:24:39 +0800 | From | Tang Chen <> | Subject | Re: [PATCH 1/2] Use kacpi_hotplug_wq to handle container hotplug event. |
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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) > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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