[GIT PULL 19/19] hw/input/ps2: say why unknown keyboard commands draw a resend

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

From: Christian Quante <christian@quante.one>

The keyboard path has answered unknown commands with KBD_REPLY_RESEND
since commit 06b3611fc2a3 ("ps2: reject unknown commands, instead of
blindly accepting them"), but never said why. Give it the comment the
mouse path just gained, so the reasoning is written down in both
places.

Suggested-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Christian Quante <christian@quante.one>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Message-ID: <20260825075127.34876-3-christian@quante.one>
---
 hw/input/ps2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index e8300d2d8308..01af4350b3bc 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -647,6 +647,10 @@ void ps2_write_keyboard(PS2KbdState *s, int val)
             ps2_cqueue_1(ps2, KBD_REPLY_ACK);
             break;
         default:
+            /*
+             * A PS/2 device answers every command it is given; an unknown
+             * one draws a resend.
+             */
             ps2_cqueue_1(ps2, KBD_REPLY_RESEND);
             break;
         }

-- 
2.55.0.543.g5ebe2ebe4ea8