stmmac: Validate hwtstamp_config completely before applying it

stmmac_hwtstamp_ioctl() should validate all fields of hwtstamp_config
before making any changes.  Currently it sets the TX configuration
before validating the rx_filter field.

Compile-tested only.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8d4ccd3..8a7a23a 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -435,16 +435,9 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
        if (config.flags)
                return -EINVAL;
 
-       switch (config.tx_type) {
-       case HWTSTAMP_TX_OFF:
-               priv->hwts_tx_en = 0;
-               break;
-       case HWTSTAMP_TX_ON:
-               priv->hwts_tx_en = 1;
-               break;
-       default:
+       if (config.tx_type != HWTSTAMP_TX_OFF &&
+           config.tx_type != HWTSTAMP_TX_ON)
                return -ERANGE;
-       }
 
        if (priv->adv_ts) {
                switch (config.rx_filter) {
@@ -576,6 +569,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
                }
        }
        priv->hwts_rx_en = ((config.rx_filter == HWTSTAMP_FILTER_NONE) ? 0 : 1);
+       priv->hwts_tx_en = config.tx_type == HWTSTAMP_TX_ON;
 
        if (!priv->hwts_tx_en && !priv->hwts_rx_en)
                priv->hw->ptp->config_hw_tstamping(priv->ioaddr, 0);