drivers: net: cpsw: fix wrong regs access in cpsw_ndo_open

The cpsw_ndo_open() could try to access CPSW registers before
calling pm_runtime_get_sync(). This will trigger L3 error:

 WARNING: CPU: 0 PID: 21 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x220/0x34c()
 44000000.ocp:L3 Custom Error: MASTER M2 (64-bit) TARGET L4_FAST (Idle): Data Access in Supervisor mode during Functional access

and CPSW will stop functioning.

Hence, fix it by moving pm_runtime_get_sync() before the first access
to CPSW registers in cpsw_ndo_open().

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 42fdfd4..bbb77cd 100644 (file)
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1251,12 +1251,12 @@ static int cpsw_ndo_open(struct net_device *ndev)
        int i, ret;
        u32 reg;
 
+       pm_runtime_get_sync(&priv->pdev->dev);
+
        if (!cpsw_common_res_usage_state(priv))
                cpsw_intr_disable(priv);
        netif_carrier_off(ndev);
 
-       pm_runtime_get_sync(&priv->pdev->dev);
-
        reg = priv->version;
 
        dev_info(priv->dev, "initializing cpsw version %d.%d (%d)\n",