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/sbs.c b/drivers/acpi/sbs.c
index 585ae3c..10a3651 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -483,8 +483,6 @@
struct file_operations *state_fops,
struct file_operations *alarm_fops, void *data)
{
- struct proc_dir_entry *entry = NULL;
-
if (!*dir) {
*dir = proc_mkdir(dir_name, parent_dir);
if (!*dir) {
@@ -494,34 +492,19 @@
}
/* 'info' [R] */
- if (info_fops) {
- entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
- if (entry) {
- entry->proc_fops = info_fops;
- entry->data = data;
- entry->owner = THIS_MODULE;
- }
- }
+ if (info_fops)
+ proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
+ info_fops, data);
/* 'state' [R] */
- if (state_fops) {
- entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
- if (entry) {
- entry->proc_fops = state_fops;
- entry->data = data;
- entry->owner = THIS_MODULE;
- }
- }
+ if (state_fops)
+ proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
+ state_fops, data);
/* 'alarm' [R/W] */
- if (alarm_fops) {
- entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
- if (entry) {
- entry->proc_fops = alarm_fops;
- entry->data = data;
- entry->owner = THIS_MODULE;
- }
- }
+ if (alarm_fops)
+ proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
+ alarm_fops, data);
return 0;
}