1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 11abc7bf777e..6daeace796a8 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -109,7 +109,7 @@ static struct proc_dir_entry *acpi_ac_dir;
 
 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 {
-        struct acpi_ac *ac = (struct acpi_ac *)seq->private;
+        struct acpi_ac *ac = seq->private;
 
 
         if (!ac)
@@ -187,7 +187,7 @@ static int acpi_ac_remove_fs(struct acpi_device *device)
 
 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 {
-        struct acpi_ac *ac = (struct acpi_ac *)data;
+        struct acpi_ac *ac = data;
         struct acpi_device *device = NULL;
 
 
@@ -221,10 +221,9 @@ static int acpi_ac_add(struct acpi_device *device)
         if (!device)
                 return -EINVAL;
 
-        ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
+        ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
         if (!ac)
                 return -ENOMEM;
-        memset(ac, 0, sizeof(struct acpi_ac));
 
         ac->device = device;
         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
@@ -269,7 +268,7 @@ static int acpi_ac_remove(struct acpi_device *device, int type)
         if (!device || !acpi_driver_data(device))
                 return -EINVAL;
 
-        ac = (struct acpi_ac *)acpi_driver_data(device);
+        ac = acpi_driver_data(device);
 
         status = acpi_remove_notify_handler(device->handle,
                                             ACPI_ALL_NOTIFY, acpi_ac_notify);