[PATCH net v2] cxgb4: ptp_clock_register() returns error pointers

[Ganesh Goudar]

Check ptp_clock_register() return not only for NULL but
also for error pointers, and also nullify adapter->ptp_clock
if ptp_clock_register() fails.

Fixes: 9c33e4208bce ("cxgb4: Add PTP Hardware Clock (PHC) support")
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Cc: Richard Cochran <richardcoch...@gmail.com>
Signed-off-by: Ganesh Goudar <ganes...@chelsio.com>
---
v2: nullifying adapter->ptp_clock if ptp_clock_register() fails.
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c 
b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
index 50517cf..9f9d6ca 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
@@ -441,7 +441,8 @@ void cxgb4_ptp_init(struct adapter *adapter)
 
        adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
                                                &adapter->pdev->dev);
-       if (!adapter->ptp_clock) {
+       if (IS_ERR_OR_NULL(adapter->ptp_clock)) {
+               adapter->ptp_clock = NULL;
                dev_err(adapter->pdev_dev,
                        "PTP %s Clock registration has failed\n", __func__);
                return;
-- 
2.1.0