linux-kernel - [PATCH] Input: mousedev - fix implicit conversion warning

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Date:   Thu, 25 May 2017 22:22:16 -0700
From:   Nick Desaulniers <nick.desaulniers@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     gregkh@...uxfoundation.org,
        Nick Desaulniers <nick.desaulniers@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Input: mousedev - fix implicit conversion warning

Clang warns:

drivers/input/mousedev.c:653:63: error: implicit conversion from 'int'
to 'signed char' changes value from 200 to -56
[-Wconstant-conversion]
  client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
                                                            ~ ^~~

As far as I can tell, from

http://www.computer-engineering.org/ps2mouse/

Under "Command Set" > "0xE9 (Status Request)"

the value 200 is a valid sample rate. An explicit cast silences this
warning.

Signed-off-by: Nick Desaulniers <nick.desaulniers@...il.com>
---
 drivers/input/mousedev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index 0e0ff84088fd..816e2431bba8 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -650,7 +650,9 @@ static void mousedev_generate_response(struct mousedev_client *client,
 		break;
 
 	case 0xe9: /* Get info */
-		client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
+		client->ps2[1] = 0x60;
+		client->ps2[2] = 3;
+		client->ps2[3] = (char) 200;
 		client->bufsiz = 4;
 		break;
 
-- 
2.11.0