add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/ethernet/natsemi/sonic.c
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@@ -292,7 +292,7 @@
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 	 */
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 	laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
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-	if (!laddr) {
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+	if (dma_mapping_error(lp->device, laddr)) {
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 		pr_err_ratelimited("%s: failed to map tx DMA buffer.\n", dev->name);
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 		dev_kfree_skb_any(skb);
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 		return NETDEV_TX_OK;
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@@ -509,7 +509,7 @@
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 	*new_addr = dma_map_single(lp->device, skb_put(*new_skb, SONIC_RBSIZE),
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 				   SONIC_RBSIZE, DMA_FROM_DEVICE);
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-	if (!*new_addr) {
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+	if (dma_mapping_error(lp->device, *new_addr)) {
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 		dev_kfree_skb(*new_skb);
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 		*new_skb = NULL;
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 		return false;