[PATCH v2 02/11] ps2: don't raise an interrupt if queue is full

From: "Volker Rümelin" <vr_qemu@t-online.de>
To: "Michael S. Tsirkin" <mst@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Philippe Mathieu-Daudé" <philmd@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: [PATCH v2 02/11] ps2: don't raise an interrupt if queue is full
Date: Fri,  7 May 2021 20:09:44 +0200	[thread overview]
Message-ID: <20210507180953.8530-2-vr_qemu@t-online.de> (raw)
In-Reply-To: <a898b0d5-7086-9699-ae8b-9524ad319b01@t-online.de>

ps2_queue() behaves differently than the very similar functions
ps2_queue_2() to ps2_queue_4(). The first one calls update_irq()
even if the queue is full, the others don't. Change ps2_queue()
to be consistent with the others.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
---
 hw/input/ps2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index d9f79e8260..55a81a0c51 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -212,6 +212,10 @@ void ps2_raise_irq(PS2State *s)
 
 void ps2_queue(PS2State *s, int b)
 {
+    if (PS2_QUEUE_SIZE - s->queue.count < 1) {
+        return;
+    }
+
     ps2_queue_noirq(s, b);
     s->update_irq(s->update_arg, 1);
 }
-- 
2.26.2


