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isdn: avoid calling tty_ldisc_flush() in atomic context
commit bc10f96 upstream. Remove the call to tty_ldisc_flush() from the RESULT_NO_CARRIER branch of isdn_tty_modem_result(), as already proposed in commit 00409bb. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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