netdev - [PATCH] CAIF: write check

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Date:	Wed, 7 Apr 2010 14:17:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sjur BRENDELAND <sjur.brandeland@...ricsson.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH] CAIF: write check

caif: check write operations

From: Alan Cox <alan@...ux.intel.com>

write is optional for a tty device. Check that we have a write op rather
than calling NULL.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 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 b271aa0..38c0186 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);

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