From: Olivier Blin <blino@mandriva.com>
Date: Fri, 8 Aug 2008 19:01:11 +0000 (-0700)
Subject: hso: fix oops in read/write callbacks
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=add477df674db00377d9a4dc0d9b553ce79bc06d;p=linux-beck.git

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>
---

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 031d07b105af..94a27f764e6b 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -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);
 	}