tg3: Validate hwtstamp_config completely before applying it

tg3_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>
Acked-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 00c5be8..a9e0684 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -13618,16 +13618,9 @@ static int tg3_hwtstamp_ioctl(struct net_device *dev,
        if (stmpconf.flags)
                return -EINVAL;
 
-       switch (stmpconf.tx_type) {
-       case HWTSTAMP_TX_ON:
-               tg3_flag_set(tp, TX_TSTAMP_EN);
-               break;
-       case HWTSTAMP_TX_OFF:
-               tg3_flag_clear(tp, TX_TSTAMP_EN);
-               break;
-       default:
+       if (stmpconf.tx_type != HWTSTAMP_TX_ON &&
+           stmpconf.tx_type != HWTSTAMP_TX_OFF)
                return -ERANGE;
-       }
 
        switch (stmpconf.rx_filter) {
        case HWTSTAMP_FILTER_NONE:
@@ -13689,6 +13682,11 @@ static int tg3_hwtstamp_ioctl(struct net_device *dev,
                tw32(TG3_RX_PTP_CTL,
                     tp->rxptpctl | TG3_RX_PTP_CTL_HWTS_INTERLOCK);
 
+       if (stmpconf.tx_type == HWTSTAMP_TX_ON)
+               tg3_flag_set(tp, TX_TSTAMP_EN);
+       else
+               tg3_flag_clear(tp, TX_TSTAMP_EN);
+
        return copy_to_user(ifr->ifr_data, &stmpconf, sizeof(stmpconf)) ?
                -EFAULT : 0;
 }