[PATCH] tty: Fix hvc return

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From: Alan Cox <alan@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
---

 drivers/tty/hvc/hvc_console.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index b57dcbd..a5dec1c 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -568,7 +568,7 @@ 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;
 }

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