ti_cpsw: Validate hwtstamp_config completely before applying it

cpsw_hwtstamp_ioctl() should validate all fields of hwtstamp_config,
and the hardware version, before making any changes.  Currently it
sets the TX configuration before validating the rx_filter field
or that the hardware supports timestamping.

Also correct the error code for hardware versions that don't
support timestamping.  ENOTSUPP is used by the NFS implementation
and is not part of userland API; we want EOPNOTSUPP (which glibc
also calls ENOTSUP, with one 'P').

Untested as I don't have a cross-compiler to hand.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Mugunthan V N <mugunthanvnm@gmail.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 90d41d26ec6d8c37f04682aa05b8731a4d4c3002..30b0c032e5fc06ba30e0aa51d1902b36e93030b5 100644 (file)
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1323,6 +1323,10 @@ static int cpsw_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
        struct cpts *cpts = priv->cpts;
        struct hwtstamp_config cfg;
 
+       if (priv->version != CPSW_VERSION_1 &&
+           priv->version != CPSW_VERSION_2)
+               return -EOPNOTSUPP;
+
        if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
                return -EFAULT;
 
@@ -1330,16 +1334,8 @@ static int cpsw_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
        if (cfg.flags)
                return -EINVAL;
 
-       switch (cfg.tx_type) {
-       case HWTSTAMP_TX_OFF:
-               cpts->tx_enable = 0;
-               break;
-       case HWTSTAMP_TX_ON:
-               cpts->tx_enable = 1;
-               break;
-       default:
+       if (cfg.tx_type != HWTSTAMP_TX_OFF && cfg.tx_type != HWTSTAMP_TX_ON)
                return -ERANGE;
-       }
 
        switch (cfg.rx_filter) {
        case HWTSTAMP_FILTER_NONE:
@@ -1366,6 +1362,8 @@ static int cpsw_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
                return -ERANGE;
        }
 
+       cpts->tx_enable = cfg.tx_type == HWTSTAMP_TX_ON;
+
        switch (priv->version) {
        case CPSW_VERSION_1:
                cpsw_hwtstamp_v1(priv);
@@ -1374,7 +1372,7 @@ static int cpsw_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
                cpsw_hwtstamp_v2(priv);
                break;
        default:
-               return -ENOTSUPP;
+               WARN_ON(1);
        }
 
        return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;