net: micrel: Fix receiving the timestamp in the frame for lan8841

The blamed commit started to use the ptp workqueue to get the second
part of the timestamp. And when the port was set down, then this
workqueue is stopped. But if the config option NETWORK_PHY_TIMESTAMPING
is not enabled, then the ptp_clock is not initialized so then it would
crash when it would try to access the delayed work.
So then basically by setting up and then down the port, it would crash.
The fix consists in checking if the ptp_clock is initialized and only
then cancel the delayed work.

Fixes: cc7554954848 ("net: micrel: Change to receive timestamp in the frame for lan8841")
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index ddb50a0e2bc822c75d1c0126465c6026144291b7..87780465cd0d59fcbd18eb6b7152a0e42d8e90a3 100644 (file)
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -4676,7 +4676,8 @@ static int lan8841_suspend(struct phy_device *phydev)
        struct kszphy_priv *priv = phydev->priv;
        struct kszphy_ptp_priv *ptp_priv = &priv->ptp_priv;
 
-       ptp_cancel_worker_sync(ptp_priv->ptp_clock);
+       if (ptp_priv->ptp_clock)
+               ptp_cancel_worker_sync(ptp_priv->ptp_clock);
 
        return genphy_suspend(phydev);
 }