[PATCH] net: stmmac: ensure jumbo_frm error return is correctly checked for -ve value

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

The current comparison of entry < 0 will never be true since entry is an
unsigned integer. Cast entry to an int to ensure -ve error return values
from the call to jumbo_frm are correctly being caught.

Detected by CoverityScan, CID#1238760 ("Macro compares unsigned to 0")

Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c 
b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 68a188e74c54..5cc19506ba85 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2996,7 +2996,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, 
struct net_device *dev)
        if (unlikely(is_jumbo) && likely(priv->synopsys_id <
                                         DWMAC_CORE_4_00)) {
                entry = priv->hw->mode->jumbo_frm(tx_q, skb, csum_insertion);
-               if (unlikely(entry < 0))
+               if (unlikely((int)entry < 0))
                        goto dma_map_err;
        }
 
-- 
2.11.0