From: Alan Cox <alan@linux.intel.com>
Date: Mon, 17 Sep 2012 11:03:39 +0000 (+0100)
Subject: tty: Fix hvc return
X-Git-Tag: upstream/snapshot3+hdmi~6592^2~38
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d83114e9754cf5deb3424217ff2f10cace1428e3;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

tty: Fix hvc return

HVC returns a size of -1 bytes for the write room in some cases.
This is bogus and not handled by the tty layer at all.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 7f80f15..4a65299 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -558,7 +558,7 @@ static int hvc_write_room(struct tty_struct *tty)
 	struct hvc_struct *hp = tty->driver_data;
 
 	if (!hp)
-		return -1;
+		return 0;
 
 	return hp->outbuf_size - hp->n_outbuf;
 }