From: Daniel Mack <daniel@xxxxxxxxxx>
[ Upstream commit de9c7854e6e1589f639c6352112956d08243b659 ]
In setups with fixed-link settings there is no mdio node in DTS.
axienet_probe() already handles that gracefully but lp->mii_bus is
then NULL.
Fix code that tries to blindly grab the MDIO lock by introducing two helper
functions that make the locking conditional.
Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/xilinx/xilinx_axienet.h | 12 ++++++++++++
drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 12 ++++++------
2 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
index a03c3ca1b28d..9e2cddba3b5b 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
@@ -497,6 +497,18 @@ static inline u32 axinet_ior_read_mcr(struct axienet_local *lp)
return axienet_ior(lp, XAE_MDIO_MCR_OFFSET);
}
+static inline void axienet_lock_mii(struct axienet_local *lp)
+{
+ if (lp->mii_bus)
+ mutex_lock(&lp->mii_bus->mdio_lock);
+}
+
+static inline void axienet_unlock_mii(struct axienet_local *lp)
+{
+ if (lp->mii_bus)
+ mutex_unlock(&lp->mii_bus->mdio_lock);
+}
+
/**
* axienet_iow - Memory mapped Axi Ethernet register write
* @lp: Pointer to axienet local structure
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 4cd701a9277d..82176dd2cdf3 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1053,9 +1053,9 @@ static int axienet_open(struct net_device *ndev)
* including the MDIO. MDIO must be disabled before resetting.
* Hold MDIO bus lock to avoid MDIO accesses during the reset.
*/
- mutex_lock(&lp->mii_bus->mdio_lock);
+ axienet_lock_mii(lp);
ret = axienet_device_reset(ndev);
- mutex_unlock(&lp->mii_bus->mdio_lock);
+ axienet_unlock_mii(lp);
ret = phylink_of_phy_connect(lp->phylink, lp->dev->of_node, 0);
if (ret) {
@@ -1148,9 +1148,9 @@ static int axienet_stop(struct net_device *ndev)
}
/* Do a reset to ensure DMA is really stopped */
- mutex_lock(&lp->mii_bus->mdio_lock);
+ axienet_lock_mii(lp);
__axienet_device_reset(lp);
- mutex_unlock(&lp->mii_bus->mdio_lock);
+ axienet_unlock_mii(lp);
cancel_work_sync(&lp->dma_err_task);
@@ -1664,9 +1664,9 @@ static void axienet_dma_err_handler(struct work_struct *work)
* including the MDIO. MDIO must be disabled before resetting.
* Hold MDIO bus lock to avoid MDIO accesses during the reset.
*/
- mutex_lock(&lp->mii_bus->mdio_lock);
+ axienet_lock_mii(lp);
__axienet_device_reset(lp);
- mutex_unlock(&lp->mii_bus->mdio_lock);
+ axienet_unlock_mii(lp);
for (i = 0; i < lp->tx_bd_num; i++) {
cur_p = &lp->tx_bd_v[i];
--
2.30.2
