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ACPI: SBS: fix initialization, sem2mutex 

cm_sbs_sem is being downed (via acpi_ac_init->acpi_lock_ac_dir) before it is
initialised, with grave results.

- Make it a mutex

- Initialise it

- Make it static

- Clean other stuff up.

Thanks to Paul Drynoff <pauldrynoff@gmail.com> for reporting and testing.

Cc: Rich Townsend <rhdt@bartol.udel.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Andrew Morton 2006-07-10 02:34:45 -04:00 committed by Len Brown
parent 953969ddf5
commit 8970bfe706
1 changed files with 14 additions and 32 deletions
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46
drivers/acpi/cm_sbs.c
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@ -39,50 +39,43 @@ ACPI_MODULE_NAME("cm_sbs")
static struct proc_dir_entry *acpi_ac_dir;
static struct proc_dir_entry *acpi_battery_dir;
static struct semaphore cm_sbs_sem;
static DEFINE_MUTEX(cm_sbs_mutex);
static int lock_ac_dir_cnt = 0;
static int lock_battery_dir_cnt = 0;
static int lock_ac_dir_cnt;
static int lock_battery_dir_cnt;
struct proc_dir_entry *acpi_lock_ac_dir(void)
{
down(&cm_sbs_sem);
if (!acpi_ac_dir) {
mutex_lock(&cm_sbs_mutex);
if (!acpi_ac_dir)
acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
}
if (acpi_ac_dir) {
lock_ac_dir_cnt++;
} else {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Cannot create %s\n", ACPI_AC_CLASS));
}
up(&cm_sbs_sem);
mutex_unlock(&cm_sbs_mutex);
return acpi_ac_dir;
}
EXPORT_SYMBOL(acpi_lock_ac_dir);
void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
{
down(&cm_sbs_sem);
if (acpi_ac_dir_param) {
mutex_lock(&cm_sbs_mutex);
if (acpi_ac_dir_param)
lock_ac_dir_cnt--;
}
if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
acpi_ac_dir = 0;
}
up(&cm_sbs_sem);
mutex_unlock(&cm_sbs_mutex);
}
EXPORT_SYMBOL(acpi_unlock_ac_dir);
struct proc_dir_entry *acpi_lock_battery_dir(void)
{
down(&cm_sbs_sem);
mutex_lock(&cm_sbs_mutex);
if (!acpi_battery_dir) {
acpi_battery_dir =
proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
@ -93,39 +86,28 @@ struct proc_dir_entry *acpi_lock_battery_dir(void)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Cannot create %s\n", ACPI_BATTERY_CLASS));
}
up(&cm_sbs_sem);
mutex_unlock(&cm_sbs_mutex);
return acpi_battery_dir;
}
EXPORT_SYMBOL(acpi_lock_battery_dir);
void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
{
down(&cm_sbs_sem);
if (acpi_battery_dir_param) {
mutex_lock(&cm_sbs_mutex);
if (acpi_battery_dir_param)
lock_battery_dir_cnt--;
}
if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
&& acpi_battery_dir) {
remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
acpi_battery_dir = 0;
}
up(&cm_sbs_sem);
mutex_unlock(&cm_sbs_mutex);
return;
}
EXPORT_SYMBOL(acpi_unlock_battery_dir);
static int __init acpi_cm_sbs_init(void)
{
if (acpi_disabled)
return 0;
init_MUTEX(&cm_sbs_sem);
return 0;
}
subsys_initcall(acpi_cm_sbs_init);