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hso: fix oops in read/write callbacks 

The tty may be closed already when the read/write callbacks are called.
This patch checks that the ttys still exist before waking them up.

Signed-off-by: Olivier Blin <blino@mandriva.com>
Acked-by: Alan Cox <alan@redhat.com>
Cc: Jari Tenhunen <jari.tenhunen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Olivier Blin 2008-08-08 12:01:11 -07:00 committed by Jeff Garzik
parent 1595ab5d7d
commit add477df67
1 changed files with 4 additions and 2 deletions
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6
drivers/net/usb/hso.c
View File

@ -1467,7 +1467,8 @@ static void hso_std_serial_write_bulk_callback(struct urb *urb)
return;
}
hso_put_activity(serial->parent);
tty_wakeup(serial->tty);
if (serial->tty)
tty_wakeup(serial->tty);
hso_kick_transmit(serial);
D1(" ");
@ -1538,7 +1539,8 @@ static void ctrl_callback(struct urb *urb)
clear_bit(HSO_SERIAL_FLAG_RX_SENT, &serial->flags);
} else {
hso_put_activity(serial->parent);
tty_wakeup(serial->tty);
if (serial->tty)
tty_wakeup(serial->tty);
/* response to a write command */
hso_kick_transmit(serial);
}