These changes are a raw update to a vanilla kernel 4.1.10, with the

[kvmfornfv.git] / kernel / drivers / isdn / gigaset / ser-gigaset.c

diff --git a/kernel/drivers/isdn/gigaset/ser-gigaset.c b/kernel/drivers/isdn/gigaset/ser-gigaset.c
index 8c91fd5..3ac9c41 100644 (file)
--- a/kernel/drivers/isdn/gigaset/ser-gigaset.c
+++ b/kernel/drivers/isdn/gigaset/ser-gigaset.c
@@ -524,9 +524,18 @@ gigaset_tty_open(struct tty_struct *tty)
        cs->hw.ser->tty = tty;
        atomic_set(&cs->hw.ser->refcnt, 1);
        init_completion(&cs->hw.ser->dead_cmp);
-
        tty->disc_data = cs;
 
+       /* Set the amount of data we're willing to receive per call
+        * from the hardware driver to half of the input buffer size
+        * to leave some reserve.
+        * Note: We don't do flow control towards the hardware driver.
+        * If more data is received than will fit into the input buffer,
+        * it will be dropped and an error will be logged. This should
+        * never happen as the device is slow and the buffer size ample.
+        */
+       tty->receive_room = RBUFSIZE/2;
+
        /* OK.. Initialization of the datastructures and the HW is done.. Now
         * startup system and notify the LL that we are ready to run
         */