i40e: use WARN_ONCE to replace the commented BUG_ON size check

We don't really want to use BUG_ON here since that would completely
crash the kernel, thus the reason we commented it out. We *can't* use
BUILD_BUG_ON because at least now (a) the sizes aren't constant (we are
fixing this) and (b) not all compilers are smart enough to understand
that "p - data" is a constant.

Instead, just use a WARN_ONCE so that the first time we end up with an
incorrect size we will dump a stack trace and a message, hopefully
highlighting the issues early in testing.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index c50ed2d..32bcb6a 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1792,8 +1792,8 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
        struct i40e_netdev_priv *np = netdev_priv(netdev);
        struct i40e_vsi *vsi = np->vsi;
        struct i40e_pf *pf = vsi->back;
-       char *p = (char *)data;
        unsigned int i;
+       u8 *p = data;
 
        for (i = 0; i < I40E_NETDEV_STATS_LEN; i++) {
                snprintf(p, ETH_GSTRING_LEN, "%s",
@@ -1864,7 +1864,9 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
                         "port.rx_priority_%u_xon_2_xoff", i);
                p += ETH_GSTRING_LEN;
        }
-       /* BUG_ON(p - data != I40E_STATS_LEN * ETH_GSTRING_LEN); */
+
+       WARN_ONCE(p - data != i40e_get_stats_count(netdev) * ETH_GSTRING_LEN,
+                 "stat strings count mismatch!");
 }
 
 static void i40e_get_priv_flag_strings(struct net_device *netdev, u8 *data)