diff options
| author | Alan Cox <alan@linux.intel.com> | 2010-04-07 16:49:31 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-07 16:49:31 -0700 |
| commit | c93f09402106f22601838ee2bb0d02bae934b5e5 (patch) | |
| tree | 5e8471a9bcdbf63e170380163a987b51f82719d7 /drivers/net | |
| parent | 298b9e44be9592e94c0e69a5d3893cd11f5484fa (diff) | |
caif: check write operations
write is optional for a tty device. Check that we have a write op rather
than calling NULL.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/caif/caif_serial.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c index 3502f607117f..c669ec37483b 100644 --- a/drivers/net/caif/caif_serial.c +++ b/drivers/net/caif/caif_serial.c @@ -312,6 +312,10 @@ static int ldisc_open(struct tty_struct *tty) char name[64]; int result; + /* No write no play */ + if (tty->ops->write == NULL) + return -EOPNOTSUPP; + sprintf(name, "cf%s", tty->name); dev = alloc_netdev(sizeof(*ser), name, caifdev_setup); ser = netdev_priv(dev); |