[43/93] KVM: PIT: control word is write-only
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From: Greg KH on 19 Feb 2010 12:20 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Marcelo Tosatti <mtosatti(a)redhat.com> commit ee73f656a604d5aa9df86a97102e4e462dd79924 upstream. PIT control word (address 0x43) is write-only, reads are undefined. Signed-off-by: Marcelo Tosatti <mtosatti(a)redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de> --- arch/x86/kvm/i8254.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -465,6 +465,9 @@ static int pit_ioport_read(struct kvm_io return -EOPNOTSUPP; addr &= KVM_PIT_CHANNEL_MASK; + if (addr == 3) + return 0; + s = &pit_state->channels[addr]; mutex_lock(&pit_state->lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |