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 <tangc...@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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