From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Tue, 6 Aug 2013 13:48:36 +0000 (+0100)
Subject: rombios/keyboard: Don't needlessly poll the status register
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~6556
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:///%22http:/www.example.com/cgi/%22https:/?a=commitdiff_plain;h=20025504271220ab3bf041955a3cd40c6057e58e;p=xen.git

rombios/keyboard: Don't needlessly poll the status register

Repeated polling of the status register is not going to change its value, so
don't needlessly take 8192 traps to Qemu when 1 will do.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
---

diff --git a/tools/firmware/rombios/rombios.c b/tools/firmware/rombios/rombios.c
index 80980b67f8..e364759b3b 100644
--- a/tools/firmware/rombios/rombios.c
+++ b/tools/firmware/rombios/rombios.c
@@ -1805,12 +1805,12 @@ keyboard_init()
     while ( (inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x00);
 
     /* flush incoming keys */
-    max=0x2000;
+    max=2;
     while (--max > 0) {
         outb(0x80, 0x00);
         if (inb(0x64) & 0x01) {
             inb(0x60);
-            max = 0x2000;
+            max = 2;
             }
         }