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| author | Matthias Goebl <matthias.goebl@goebl.net> | 2008-01-04 02:19:30 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-04 03:55:40 -0800 |
| commit | 00409bb045887ec5e7b9e351bc080c38ab6bfd33 (patch) | |
| tree | 829ec62282d291df72e0e1ab653bc4b5eb2da86e /drivers/isdn/i4l | |
| parent | 134d99e302618eeb102c2a5be1f9e98696288bdd (diff) | |
| download | lwn-00409bb045887ec5e7b9e351bc080c38ab6bfd33.tar.gz lwn-00409bb045887ec5e7b9e351bc080c38ab6bfd33.zip | |
[ISDN] i4l: 'NO CARRIER' message lost after ldisc flush
The ISDN tty layer doesn't produce a 'NO CARRIER' message after hangup.
I suppose it broke when tty_buffer_flush() has been added to
tty_ldisc_flush() in the commit below.
For isdn_tty_modem_result(RESULT_NO_CARRIER..) the
message inserted via isdn_tty_at_cout() -> tty_insert_flip_char()
is flushed immediately by tty_ldisc_flush() -> tty_buffer_flush().
More annoyingly, the audio abort sequence DLE-ETX is also lost.
This patch fixes only active audio connections, because I assume that nobody
changes the line discipline for audio.
For non-audio connections the problem remains.
Maybe we can remove the tty_ldisc_flush() in isdn_tty_modem_result()
at all because it's done at tty_close?
On Mon, May 07, 2007 at 04:05:57PM -0500, Paul Fulghum wrote:
> Flush the tty flip buffer when the line discipline
> input queue is flushed, including the user call
> tcflush(TCIFLUSH/TCIOFLUSH). This prevents unexpected
> stale data after a user application calls tcflush().
>
> Cc: Alan Cox <alan@lxorguk.org.uk>
> Cc: Antonino Ingargiola <tritemio@gmail.com>
> Signed-off-by: Paul Fulghum <paulkf@microgate.com>
>
> --- a/drivers/char/tty_io.c 2007-05-04 05:46:55.000000000 -0500
> +++ b/drivers/char/tty_io.c 2007-05-05 03:23:46.000000000 -0500
> @@ -1240,6 +1263,7 @@ void tty_ldisc_flush(struct tty_struct *
> ld->flush_buffer(tty);
> tty_ldisc_deref(ld);
> }
> + tty_buffer_flush(tty);
[..]
Signed-off-by: Matthias Goebl <matthias.goebl@goebl.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/i4l')
| -rw-r--r-- | drivers/isdn/i4l/isdn_tty.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c index 4e5f87c1e714..24679a3f5596 100644 --- a/drivers/isdn/i4l/isdn_tty.c +++ b/drivers/isdn/i4l/isdn_tty.c @@ -2645,7 +2645,12 @@ isdn_tty_modem_result(int code, modem_info * info) if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) { return; } +#ifdef CONFIG_ISDN_AUDIO + if ( !info->vonline ) + tty_ldisc_flush(info->tty); +#else tty_ldisc_flush(info->tty); +#endif if ((info->flags & ISDN_ASYNC_CHECK_CD) && (!((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) && (info->flags & ISDN_ASYNC_CALLOUT_NOHUP)))) { |