ptp: fix error print of ptp_kvm on X86_64 platform

Commit a86ed2cfa13c5 ("ptp: Don't print an error if ptp_kvm is not supported")
fixes the error message print on ARM platform by only concerning about
the case that the error returned from kvm_arch_ptp_init() is not -EOPNOTSUPP.
Although the ARM platform returns -EOPNOTSUPP if ptp_kvm is not supported
while X86_64 platform returns -KVM_EOPNOTSUPP, both error codes share the
same value 95.

Actually kvm_arch_ptp_init() on X86_64 platform can return three kinds of
errors (-KVM_ENOSYS, -KVM_EOPNOTSUPP and -KVM_EFAULT). The problem is that
-KVM_EOPNOTSUPP is masked out and -KVM_EFAULT is ignored among them.
This patch fixes this by returning them to ptp_kvm_init() respectively.

Signed-off-by: Kele Huang <huangkele@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/ptp/ptp_kvm_x86.c b/drivers/ptp/ptp_kvm_x86.c
index d0096cd..4991054 100644 (file)
--- a/drivers/ptp/ptp_kvm_x86.c
+++ b/drivers/ptp/ptp_kvm_x86.c
@@ -31,10 +31,10 @@ int kvm_arch_ptp_init(void)
 
        ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa,
                             KVM_CLOCK_PAIRING_WALLCLOCK);
-       if (ret == -KVM_ENOSYS || ret == -KVM_EOPNOTSUPP)
+       if (ret == -KVM_ENOSYS)
                return -ENODEV;
 
-       return 0;
+       return ret;
 }
 
 int kvm_arch_ptp_get_clock(struct timespec64 *ts)