net: ethernet: microchip: lan743x: Fix skb allocation failure

The driver allocates skb during ndo_open with GFP_ATOMIC which has high chance of failure when there are multiple instances.
GFP_KERNEL is enough while open and use GFP_ATOMIC only from interrupt context.

Fixes: 23f0703 ("lan743x: Add main source files for new lan743x driver")
Signed-off-by: Yuiko Oshino <yuiko.oshino@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/lan743x_main.c

@@ -1944,7 +1944,8 @@ static void lan743x_rx_update_tail(struct lan743x_rx *rx, int index)
 				  index);
 }
 
-static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index)
+static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index,
+					gfp_t gfp)
 {
 	struct net_device *netdev = rx->adapter->netdev;
 	struct device *dev = &rx->adapter->pdev->dev;
@@ -1958,7 +1959,7 @@ static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index)
 
 	descriptor = &rx->ring_cpu_ptr[index];
 	buffer_info = &rx->buffer_info[index];
-	skb = __netdev_alloc_skb(netdev, buffer_length, GFP_ATOMIC | GFP_DMA);
+	skb = __netdev_alloc_skb(netdev, buffer_length, gfp);
 	if (!skb)
 		return -ENOMEM;
 	dma_ptr = dma_map_single(dev, skb->data, buffer_length, DMA_FROM_DEVICE);
@@ -2120,7 +2121,8 @@ static int lan743x_rx_process_buffer(struct lan743x_rx *rx)
 
 	/* save existing skb, allocate new skb and map to dma */
 	skb = buffer_info->skb;
-	if (lan743x_rx_init_ring_element(rx, rx->last_head)) {
+	if (lan743x_rx_init_ring_element(rx, rx->last_head,
+					 GFP_ATOMIC | GFP_DMA)) {
 		/* failed to allocate next skb.
 		 * Memory is very low.
 		 * Drop this packet and reuse buffer.
@@ -2335,13 +2337,16 @@ static int lan743x_rx_ring_init(struct lan743x_rx *rx)
 
 	rx->last_head = 0;
 	for (index = 0; index < rx->ring_size; index++) {
-		ret = lan743x_rx_init_ring_element(rx, index);
+		ret = lan743x_rx_init_ring_element(rx, index, GFP_KERNEL);
 		if (ret)
 			goto cleanup;
 	}
 	return 0;
 
 cleanup:
+	netif_warn(rx->adapter, ifup, rx->adapter->netdev,
+		   "Error allocating memory for LAN743x\n");
+
 	lan743x_rx_ring_cleanup(rx);
 	return ret;
 }