sfc: fix return value check in efx_ptp_probe_channel()

In case of error, the function ptp_clock_register() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 07f6baa15c0c..9a95abf2dedf 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -912,8 +912,10 @@ static int efx_ptp_probe_channel(struct efx_channel *channel)
 
         ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info,
                                             &efx->pci_dev->dev);
-        if (!ptp->phc_clock)
+        if (IS_ERR(ptp->phc_clock)) {
+                rc = PTR_ERR(ptp->phc_clock);
                 goto fail3;
+        }
 
         INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker);
         ptp->pps_workwq = create_singlethread_workqueue("sfc_pps");