From: Tilman Schmidt Date: Mon, 13 Jul 2015 22:37:13 +0000 (+0200) Subject: isdn/gigaset: reset tty->receive_room when attaching ser_gigaset X-Git-Tag: v3.2.85~19 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=d13dab5438bb8a85f299703c88f2a2d95091b705;hp=d13dab5438bb8a85f299703c88f2a2d95091b705 isdn/gigaset: reset tty->receive_room when attaching ser_gigaset commit fd98e9419d8d622a4de91f76b306af6aa627aa9c upstream. Commit 79901317ce80 ("n_tty: Don't flush buffer when closing ldisc"), first merged in kernel release 3.10, caused the following regression in the Gigaset M101 driver: Before that commit, when closing the N_TTY line discipline in preparation to switching to N_GIGASET_M101, receive_room would be reset to a non-zero value by the call to n_tty_flush_buffer() in n_tty's close method. With the removal of that call, receive_room might be left at zero, blocking data reception on the serial line. The present patch fixes that regression by setting receive_room to an appropriate value in the ldisc open method. Fixes: 79901317ce80 ("n_tty: Don't flush buffer when closing ldisc") Signed-off-by: Tilman Schmidt Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings ---