Input: i8042 - restore control register when enabling port fails

When enabling interrupts for a port fails, the interrupt enable and
port enable bits remain set in i8042_ctr. Later writes of i8042_ctr
to the hardware could accidentally retry enabling interrupts. Clear
the bits on failure.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/serio/i8042.c

@@ -385,6 +385,8 @@ static int i8042_enable_kbd_port(void)
 	i8042_ctr |= I8042_CTR_KBDINT;
 
 	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+		i8042_ctr &= ~I8042_CTR_KBDINT;
+		i8042_ctr |= I8042_CTR_KBDDIS;
 		printk(KERN_ERR "i8042.c: Failed to enable KBD port.\n");
 		return -EIO;
 	}
@@ -402,6 +404,8 @@ static int i8042_enable_aux_port(void)
 	i8042_ctr |= I8042_CTR_AUXINT;
 
 	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+		i8042_ctr &= ~I8042_CTR_AUXINT;
+		i8042_ctr |= I8042_CTR_AUXDIS;
 		printk(KERN_ERR "i8042.c: Failed to enable AUX port.\n");
 		return -EIO;
 	}