toshiba_acpi: fix and cleanup toshiba_kbd_bl_mode_store()

The current code just returns -EINVAL because mode can't be equal to
both 1 and 2.

Also this function is messy so I have cleaned it up:
1) Remove initializers like "int time = -1".  Initializing variables to
   garbage values turns off GCC's uninitialized variable warnings so it
   can lead to bugs.
2) Use kstrtoint() instead of sscanf().
3) Use SCI_KBD_MODE_FNZ and SCI_KBD_MODE_AUTO instead of magic numbers 1
   and 2.
4) Don't check for "mode == -1" because that can't happen.
5) Preserve the error code from toshiba_kbd_illum_status_set().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index ba75701..d0dce73 100644 (file)
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -1255,10 +1255,15 @@ static ssize_t toshiba_kbd_bl_mode_store(struct device *dev,
                                         const char *buf, size_t count)
 {
        struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
-       int mode = -1;
-       int time = -1;
+       int mode;
+       int time;
+       int ret;
+
 
-       if (sscanf(buf, "%i", &mode) != 1 && (mode != 2 || mode != 1))
+       ret = kstrtoint(buf, 0, &mode);
+       if (ret)
+               return ret;
+       if (mode != SCI_KBD_MODE_FNZ && mode != SCI_KBD_MODE_AUTO)
                return -EINVAL;
 
        /* Set the Keyboard Backlight Mode where:
@@ -1266,11 +1271,12 @@ static ssize_t toshiba_kbd_bl_mode_store(struct device *dev,
         *      Auto - KBD backlight turns off automatically in given time
         *      FN-Z - KBD backlight "toggles" when hotkey pressed
         */
-       if (mode != -1 && toshiba->kbd_mode != mode) {
+       if (toshiba->kbd_mode != mode) {
                time = toshiba->kbd_time << HCI_MISC_SHIFT;
                time = time + toshiba->kbd_mode;
-               if (toshiba_kbd_illum_status_set(toshiba, time) < 0)
-                       return -EIO;
+               ret = toshiba_kbd_illum_status_set(toshiba, time);
+               if (ret)
+                       return ret;
                toshiba->kbd_mode = mode;
        }