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authorMatthias Goebl <matthias.goebl@goebl.net>2008-01-04 03:45:28 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-04 03:55:44 -0800
commit7fde4d779b83898851959f837c9b26fe07ee91c9 (patch)
tree233dd7a7d9b1bc1ca344cc2c78a5bd2dde4f6f40 /drivers/isdn
parent00409bb045887ec5e7b9e351bc080c38ab6bfd33 (diff)
[ISDN]: i4l: Fix DLE handling for i4l-audio
The DLE handling in i4l-audio seems to be broken. It produces spurious DLEs so asterisk 1.2.24 with chan_modem_i4l gets irritated, the error message is: "chan_modem_i4l.c:450 i4l_read: Value of escape is ^ (17)". -> There shouldn't be a DLE-^. If a spurious DLE-ETX occurs, the audio connection even dies. I use a "AVM Fritz!PCI" isdn card. I found two issues that only appear if ISDN_AUDIO_SKB_DLECOUNT(skb) > 0: - The loop in isdn_tty.c:isdn_tty_try_read() doesn't escape a DLE if it's the last character. - The loop in isdn_common.c:isdn_readbchan_tty() doesn't copy its characters, it only remembers the last one ("last = *p;"). Compare it with the loop in isdn_common.c:isdn_readbchan(), that *does* copy them ("*cp++ = *p;") correctly. The special handling of the "last" character made it more difficult. I compared it to linux-2.4.19: There was no "last"-handling and both loops did escape and copy all characters correctly. Signed-off-by: Matthias Goebl <matthias.goebl@goebl.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/i4l/isdn_common.c3
-rw-r--r--drivers/isdn/i4l/isdn_tty.c2
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index d6952959d72..9cef6fcf587 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -914,6 +914,9 @@ isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
dflag = 0;
count_pull = count_put = 0;
while ((count_pull < skb->len) && (len > 0)) {
+ /* push every character but the last to the tty buffer directly */
+ if ( count_put )
+ tty_insert_flip_char(tty, last, TTY_NORMAL);
len--;
if (dev->drv[di]->DLEflag & DLEmask) {
last = DLE;
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index 24679a3f559..9cb6e5021ad 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -85,6 +85,8 @@ isdn_tty_try_read(modem_info * info, struct sk_buff *skb)
tty_insert_flip_char(tty, DLE, 0);
tty_insert_flip_char(tty, *dp++, 0);
}
+ if (*dp == DLE)
+ tty_insert_flip_char(tty, DLE, 0);
last = *dp;
} else {
#endif