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tty: Fix the digi acceleport driver NULL checks 

This now refcounts but doesn't actually check the reference was obtained in
all the places it should.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-05-19 13:01:56 +01:00 committed by Greg Kroah-Hartman
parent 7479db0701
commit 4287341d4d
1 changed files with 9 additions and 5 deletions
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8
drivers/usb/serial/digi_acceleport.c
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@ -609,8 +609,10 @@ static void digi_wakeup_write_lock(struct work_struct *work)
static void digi_wakeup_write(struct usb_serial_port *port)
{
struct tty_struct *tty = tty_port_tty_get(&port->port);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
}
}
@ -1682,7 +1684,7 @@ static int digi_read_inb_callback(struct urb *urb)
priv->dp_throttle_restart = 1;
/* receive data */
if (opcode == DIGI_CMD_RECEIVE_DATA) {
if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
/* get flag from port_status */
flag = 0;
@ -1763,10 +1765,12 @@ static int digi_read_oob_callback(struct urb *urb)
return -1;
tty = tty_port_tty_get(&port->port);
rts = 0;
if (tty)
rts = tty->termios->c_cflag & CRTSCTS;
if (opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
spin_lock(&priv->dp_port_lock);
/* convert from digi flags to termiox flags */
if (val & DIGI_READ_INPUT_SIGNALS_CTS) {