Messages in this thread Patch in this message | | | From | Tang Chen <> | Subject | [PATCH v2 1/2] Use kacpi_hotplug_wq to handle container hotplug event. | Date | Wed, 24 Oct 2012 14:05:49 +0800 |
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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.
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> --- drivers/acpi/container.c | 17 ++++++++++++++++- 1 files changed, 16 insertions(+), 1 deletions(-)
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c index 69e2d6b..d300e03 100644 --- a/drivers/acpi/container.c +++ b/drivers/acpi/container.c @@ -35,6 +35,7 @@ #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #include <acpi/container.h> +#include <acpi/acpiosxf.h> #define PREFIX "ACPI: " @@ -165,14 +166,21 @@ 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_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_hp_work, work); + handle = hp_work->handle; + type = hp_work->type; + switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* Fall through */ @@ -224,6 +232,13 @@ 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_hp_work(handle, type, context, + __container_notify_cb); +} + static acpi_status container_walk_namespace_cb(acpi_handle handle, u32 lvl, void *context, void **rv) -- 1.7.1
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