Input: libps2 - better handle bad scheduler decisions

Sometimes devices send us their responses in time but due to
unfortunate scheduling decisions the receiving thread does not
get scheduled till much later and we erroneously decide that
device timed out. Work around this problem by checking whether we
received the data we needed instead of checking timeout
condition.

Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index 67248c31e19a06ab17ba7980bfd3c04fb54d7a52..be5bbbb8ae4ee5105439fc074af9a779654920eb 100644 (file)
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -210,7 +210,7 @@ int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
        timeout = wait_event_timeout(ps2dev->wait,
                                     !(ps2dev->flags & PS2_FLAG_CMD1), timeout);
 
-       if (ps2dev->cmdcnt && timeout > 0) {
+       if (ps2dev->cmdcnt && !(ps2dev->flags & PS2_FLAG_CMD1)) {
 
                timeout = ps2_adjust_timeout(ps2dev, command, timeout);
                wait_event_timeout(ps2dev->wait,