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>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index abec1ca94cf4..0c24bd4d6562 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -102,6 +102,7 @@ static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
 }
 
 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 @@ static int __init acpi_event_init(void)
 
 #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