The commit commit 7086605a6ab5 ("stmmac: fix error check when init ptp")
breaks the procedure added by the
commit efee95f42b5d ("ptp_clock: future-proofing drivers against PTP
subsystem becoming optional")

So this patch tries to re-import the logic added by the latest
commit above: it makes sense to have the stmmac_ptp_register
as void function and, inside the main, the stmmac_init_ptp can fails
in case of the capability cannot be supported by the HW.

Signed-off-by: Giuseppe Cavallaro <peppe.cavall...@st.com>
Cc: Alexandre TORGUE <alexandre.tor...@st.com>
Cc: Rayagond Kokatanur <rayag...@vayavyalabs.com>
Cc: Dan Carpenter <dan.carpen...@oracle.com>
Cc: Nicolas Pitre <n...@linaro.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      |  2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |  6 ++++--
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c  | 15 ++++-----------
 3 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h 
b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 8dc9056..b15fc55 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -145,7 +145,7 @@ int stmmac_mdio_register(struct net_device *ndev);
 int stmmac_mdio_reset(struct mii_bus *mii);
 void stmmac_set_ethtool_ops(struct net_device *netdev);
 
-int stmmac_ptp_register(struct stmmac_priv *priv);
+void stmmac_ptp_register(struct stmmac_priv *priv);
 void stmmac_ptp_unregister(struct stmmac_priv *priv);
 int stmmac_resume(struct device *dev);
 int stmmac_suspend(struct device *dev);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c 
b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6c85b61..48e71fa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -676,7 +676,9 @@ static int stmmac_init_ptp(struct stmmac_priv *priv)
        priv->hwts_tx_en = 0;
        priv->hwts_rx_en = 0;
 
-       return stmmac_ptp_register(priv);
+       stmmac_ptp_register(priv);
+
+       return 0;
 }
 
 static void stmmac_release_ptp(struct stmmac_priv *priv)
@@ -1710,7 +1712,7 @@ static int stmmac_hw_setup(struct net_device *dev, bool 
init_ptp)
        if (init_ptp) {
                ret = stmmac_init_ptp(priv);
                if (ret)
-                       netdev_warn(priv->dev, "PTP support cannot init.\n");
+                       netdev_warn(priv->dev, "fail to init PTP.\n");
        }
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c 
b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
index 5d61fb2..1477471 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
@@ -177,7 +177,7 @@ static struct ptp_clock_info stmmac_ptp_clock_ops = {
  * Description: this function will register the ptp clock driver
  * to kernel. It also does some house keeping work.
  */
-int stmmac_ptp_register(struct stmmac_priv *priv)
+void stmmac_ptp_register(struct stmmac_priv *priv)
 {
        spin_lock_init(&priv->ptp_lock);
        priv->ptp_clock_ops = stmmac_ptp_clock_ops;
@@ -185,17 +185,10 @@ int stmmac_ptp_register(struct stmmac_priv *priv)
        priv->ptp_clock = ptp_clock_register(&priv->ptp_clock_ops,
                                             priv->device);
        if (IS_ERR(priv->ptp_clock)) {
-               int ret = PTR_ERR(priv->ptp_clock);
-
+               netdev_err(priv->dev, "ptp_clock_register failed\n");
                priv->ptp_clock = NULL;
-               return ret;
-       }
-
-       spin_lock_init(&priv->ptp_lock);
-
-       netdev_dbg(priv->dev, "Added PTP HW clock successfully\n");
-
-       return 0;
+       } else if (priv->ptp_clock)
+               netdev_info(priv->dev, "registered PTP clock\n");
 }
 
 /**
-- 
2.7.4

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