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isdn/gigaset: reset tty->receive_room when attaching ser_gigaset
Commit 7990131 ("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: 7990131 ("n_tty: Don't flush buffer when closing ldisc") Signed-off-by: Tilman Schmidt <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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