net: wangxun: limit tx_max_coalesced_frames_irq

Add limitation on tx_max_coalesced_frames_irq as 0 ~ 65535, because
'wx->tx_work_limit' is declared as a member of type u16.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: NipaLocal <nipa@local>

Author: Jiawen Wu

drivers/net/ethernet/wangxun/libwx/wx_ethtool.c

@@ -334,8 +334,11 @@ int wx_set_coalesce(struct net_device *netdev,
 			return -EOPNOTSUPP;
 	}
 
-	if (ec->tx_max_coalesced_frames_irq)
-		wx->tx_work_limit = ec->tx_max_coalesced_frames_irq;
+	if (ec->tx_max_coalesced_frames_irq > WX_MAX_TX_WORK ||
+	    !ec->tx_max_coalesced_frames_irq)
+		return -EINVAL;
+
+	wx->tx_work_limit = ec->tx_max_coalesced_frames_irq;
 
 	switch (wx->mac.type) {
 	case wx_mac_sp:

drivers/net/ethernet/wangxun/libwx/wx_type.h

@@ -411,6 +411,7 @@ enum WX_MSCA_CMD_value {
 #define WX_7K_ITR                    595
 #define WX_12K_ITR                   336
 #define WX_20K_ITR                   200
+#define WX_MAX_TX_WORK               65535
 #define WX_SP_MAX_EITR               0x00000FF8U
 #define WX_AML_MAX_EITR              0x00000FFFU
 #define WX_EM_MAX_EITR               0x00007FFCU