linux-kernel - [PATCH] x86: make sure we really have an hpet mapping before using it

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Message-ID: <49481057.2030307@goop.org>
Date:	Tue, 16 Dec 2008 12:32:23 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: make sure we really have an hpet mapping before using
 it

When booting in Xen dom0, the hpet isn't really accessible, so make
sure the mapping is non-NULL before use.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/kernel/hpet.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

===================================================================
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -818,9 +818,10 @@
 
 		hpet_address = force_hpet_address;
 		hpet_enable();
-		if (!hpet_virt_address)
-			return -ENODEV;
 	}
+
+	if (!hpet_virt_address)
+		return -ENODEV;
 
 	hpet_reserve_platform_timers(hpet_readl(HPET_ID));
 


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