isdn/gigaset: reset tty->receive_room when attaching ser_gigaset

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[ Upstream commit fd98e9419d ]

Commit 79901317ce ("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: 79901317ce ("n_tty: Don't flush buffer when closing ldisc")
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Tilman Schmidt 2015-07-14 00:37:13 +02:00 • committed by Sasha Levin

parent dbb5ff1d61

commit 7cc240901f

1 changed files with 10 additions and 1 deletions

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drivers/isdn/gigaset/ser-gigaset.c

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