1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 02de49ef1bce..e64c76c8b726 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -323,6 +323,13 @@ static int acpi_battery_check(struct acpi_battery *battery)
         return result;
 }
 
+static void acpi_battery_check_present(struct acpi_battery *battery)
+{
+        if (!battery->flags.present) {
+                acpi_battery_check(battery);
+        }
+}
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
@@ -339,6 +346,8 @@ static int acpi_battery_read_info(struct seq_file *seq, void *offset)
         if (!battery)
                 goto end;
 
+        acpi_battery_check_present(battery);
+
         if (battery->flags.present)
                 seq_printf(seq, "present:                 yes\n");
         else {
@@ -423,6 +432,8 @@ static int acpi_battery_read_state(struct seq_file *seq, void *offset)
         if (!battery)
                 goto end;
 
+        acpi_battery_check_present(battery);
+
         if (battery->flags.present)
                 seq_printf(seq, "present:                 yes\n");
         else {
@@ -498,6 +509,8 @@ static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
         if (!battery)
                 goto end;
 
+        acpi_battery_check_present(battery);
+
         if (!battery->flags.present) {
                 seq_printf(seq, "present:                 no\n");
                 goto end;
@@ -535,6 +548,8 @@ acpi_battery_write_alarm(struct file *file,
         if (!battery || (count > sizeof(alarm_string) - 1))
                 return -EINVAL;
 
+        acpi_battery_check_present(battery);
+
         if (!battery->flags.present)
                 return -ENODEV;