From: Keir Fraser <keir.fraser@citrix.com>
Date: Thu, 27 Nov 2008 11:24:52 +0000 (+0000)
Subject: x86, hpet: check hpet existence
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14040^2~20
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=c44f6b31725b2142e963536ff0bd6ebcbfea2161;p=xen.git

x86, hpet: check hpet existence

Add check on hpet existence which is removed accidentally
in previous changeset (18790). Or else BAD PERIOD error can be seen.

Signed-off-by: Kevin Tian <kevin.tian@intel.com>
---

diff --git a/xen/arch/x86/hpet.c b/xen/arch/x86/hpet.c
index d5e84f4ccd..f82221bbe2 100644
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -273,6 +273,9 @@ u64 hpet_setup(void)
         return hpet_rate;
     system_reset_latch = system_reset_counter;
 
+    if ( hpet_address == 0 )
+        return 0;
+
     set_fixmap_nocache(FIX_HPET_BASE, hpet_address);
 
     hpet_id = hpet_read32(HPET_ID);