i2c-pxa2xx: check timeout correctly

timeout here maybe 0 if the event occured and a task with a higher
priority stole the cpu and we were sleeping longer than the timeout
value we specified.
In case of a real timeout I changed the error code to I2C_RETRY so we
retry the transfer.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index fa8dd2c634d9..86128363a57f 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -770,8 +770,10 @@ static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
          */
         ret = i2c->msg_idx;
 
-        if (timeout == 0)
+        if (!timeout && i2c->msg_num) {
                 i2c_pxa_scream_blue_murder(i2c, "timeout");
+                ret = I2C_RETRY;
+        }
 
  out:
         return ret;