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[Qemu-ppc] [PULL 04/11] hw/char/spapr_vty: Return amount of free buffer

From: David Gibson
Subject: [Qemu-ppc] [PULL 04/11] hw/char/spapr_vty: Return amount of free buffer entries in vty_can_receive()
Date: Wed, 23 Nov 2016 13:49:36 +1100

From: Thomas Huth <address@hidden>

The can_receive() callbacks of the character devices should return
the amount of characters that can be accepted at once, not just a
boolean value (which rather means only one character at a time).

Signed-off-by: Thomas Huth <address@hidden>
Signed-off-by: David Gibson <address@hidden>
 hw/char/spapr_vty.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/char/spapr_vty.c b/hw/char/spapr_vty.c
index 06b9b39..7c22b8b 100644
--- a/hw/char/spapr_vty.c
+++ b/hw/char/spapr_vty.c
@@ -25,7 +25,7 @@ static int vty_can_receive(void *opaque)
     VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(opaque);
-    return (dev->in - dev->out) < VTERM_BUFSIZE;
+    return VTERM_BUFSIZE - (dev->in - dev->out);
 static void vty_receive(void *opaque, const uint8_t *buf, int size)

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