[PATCH net-next v4 08/15] net: stmmac: use consistent tests for receive buffer size

["Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>]

Two out of the three sites that set the receive buffer size (via
stmmac_set_dma_bfsize()) check for rx_q->xsk_pool &&
rx_q->buf_alloc_num. One uses just rx_q->xsk_pool.

Discussing with Yoong Siang Song, the conclusion is that
stmmac_dma_operation_mode() is missing the rx_q->buf_alloc_num
check. Add this check.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 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 1d40168ec68d..787b02c2607a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2612,7 +2612,7 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
 				rxfifosz, qmode);
 
-		if (rx_q->xsk_pool) {
+		if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
 			buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
 			stmmac_set_dma_bfsize(priv, priv->ioaddr,
 					      buf_size,
-- 
2.47.3