From 2d2924af96881f3300239156d6ff316a1a3e48e5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Petr=20=C5=A0tetiar?= Date: Fri, 10 May 2019 11:35:17 +0200 Subject: net: ethernet: fix similar warning reported by kbuild test robot MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch fixes following (similar) warning reported by kbuild test robot: In function ‘memcpy’, inlined from ‘smsc75xx_init_mac_address’ at drivers/net/usb/smsc75xx.c:778:3, inlined from ‘smsc75xx_bind’ at drivers/net/usb/smsc75xx.c:1501:2: ./include/linux/string.h:355:9: warning: argument 2 null where non-null expected [-Wnonnull] return __builtin_memcpy(p, q, size); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/usb/smsc75xx.c: In function ‘smsc75xx_bind’: ./include/linux/string.h:355:9: note: in a call to built-in function ‘__builtin_memcpy’ I've replaced the offending memcpy with ether_addr_copy, because I'm 100% sure, that of_get_mac_address can't return NULL as it returns valid pointer or ERR_PTR encoded value, nothing else. I'm hesitant to just change IS_ERR into IS_ERR_OR_NULL check, as this would make the warning disappear also, but it would be confusing to check for impossible return value just to make a compiler happy. I'm now changing all occurencies of memcpy to ether_addr_copy after the of_get_mac_address call, as it's very likely, that we're going to get similar reports from kbuild test robot in the future. Fixes: a51645f70f63 ("net: ethernet: support of_get_mac_address new ERR_PTR error") Reported-by: kbuild test robot Signed-off-by: Petr Štetiar Signed-off-by: David S. Miller --- drivers/net/ethernet/allwinner/sun4i-emac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/ethernet/allwinner/sun4i-emac.c') diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c index 37ebd890ef51..9e06dff619c3 100644 --- a/drivers/net/ethernet/allwinner/sun4i-emac.c +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c @@ -871,7 +871,7 @@ static int emac_probe(struct platform_device *pdev) /* Read MAC-address from DT */ mac_addr = of_get_mac_address(np); if (!IS_ERR(mac_addr)) - memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); + ether_addr_copy(ndev->dev_addr, mac_addr); /* Check if the MAC address is valid, if not get a random one */ if (!is_valid_ether_addr(ndev->dev_addr)) { -- cgit v1.2.3