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isdn: avoid calling tty_ldisc_flush() in atomic context

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Remove the call to tty_ldisc_flush() from the RESULT_NO_CARRIER
branch of isdn_tty_modem_result(), as already proposed in commit
00409bb045.
This avoids a "sleeping function called from invalid context" BUG
when the hardware driver calls the statcallb() callback with
command==ISDN_STAT_DHUP in atomic context, which in turn calls
isdn_tty_modem_result(RESULT_NO_CARRIER, ~), and from there,
tty_ldisc_flush() which may sleep.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tilman Schmidt 2010-07-05 14:18:27 +00:00 committed by David S. Miller
parent 831334cbbb
commit bc10f96757
1 changed files with 0 additions and 6 deletions
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6
drivers/isdn/i4l/isdn_tty.c
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@ -2636,12 +2636,6 @@ 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)))) {