Input: i8042 - another attempt to fix AUX delivery checks

Do not assume that AUX_LOOP command is broken unless it
completes successfully but returns wrong (unexpected) data.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index ec195a36e8f6..db9cca3b65e0 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -553,7 +553,8 @@ static int __devinit i8042_check_aux(void)
  */
 
         param = 0x5a;
-        if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0x5a) {
+        retval = i8042_command(&param, I8042_CMD_AUX_LOOP);
+        if (retval || param != 0x5a) {
 
 /*
  * External connection test - filters out AT-soldered PS/2 i8042's
@@ -567,7 +568,12 @@ static int __devinit i8042_check_aux(void)
                     (param && param != 0xfa && param != 0xff))
                         return -1;
 
-                aux_loop_broken = 1;
+/*
+ * If AUX_LOOP completed without error but returned unexpected data
+ * mark it as broken
+ */
+                if (!retval)
+                        aux_loop_broken = 1;
         }
 
 /*