acpi: use non-racy method for proc entries creation
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data
be setup before gluing PDE to main tree.
Add correct ->owner to proc_fops to fix reading/module unloading race.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index abec1ca..0c24bd4 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -102,6 +102,7 @@
}
static const struct file_operations acpi_system_event_ops = {
+ .owner = THIS_MODULE,
.open = acpi_system_open_event,
.read = acpi_system_read_event,
.release = acpi_system_close_event,
@@ -294,10 +295,9 @@
#ifdef CONFIG_ACPI_PROC_EVENT
/* 'event' [R] */
- entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
- if (entry)
- entry->proc_fops = &acpi_system_event_ops;
- else
+ entry = proc_create("event", S_IRUSR, acpi_root_dir,
+ &acpi_system_event_ops);
+ if (!entry)
return -ENODEV;
#endif