sllin: signal timeout if there are less than configured characters

We will hit the timeout if there is a larger length configured than
actually received or none at all. Signal this to userspace.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>

diff --git a/sllin/sllin.c b/sllin/sllin.c
index 457788ce4a8088501488e9d5e99f0115b9aa9fb9..ffbdf0133b65330f2876af45c418ad19d0b32283 100644 (file)
--- a/sllin/sllin.c
+++ b/sllin/sllin.c
@@ -949,7 +949,16 @@ static enum hrtimer_restart sllin_rx_timeout_handler(struct hrtimer *hrtimer)
 {
        struct sllin *sl = container_of(hrtimer, struct sllin, rx_timer);
 
-       if (sl->lin_master) {
+       /*
+        * Signal timeout when:
+        * master: We did not receive as much characters as expected
+        * slave: * we did not receive any data bytes at all
+        *        * we know the length and didn't receive enough
+        */
+       if ((sl->lin_master) ||
+                       (sl->rx_cnt <= SLLIN_BUFF_DATA) ||
+                       ((!sl->rx_len_unknown) &&
+                       (sl->rx_cnt < sl->rx_expect))) {
                sllin_report_error(sl, LIN_ERR_RX_TIMEOUT);
                set_bit(SLF_TMOUTEVENT, &sl->flags);
        } else {