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Date: Fri, 10 May 2019 11:35:18 +0200 From: Petr Štetiar <ynezz@...e.cz> To: netdev@...r.kernel.org, Felix Fietkau <nbd@....name>, Lorenzo Bianconi <lorenzo.bianconi83@...il.com>, Ryder Lee <ryder.lee@...iatek.com>, Roy Luo <royluo@...gle.com>, Kalle Valo <kvalo@...eaurora.org>, "David S. Miller" <davem@...emloft.net>, Matthias Brugger <matthias.bgg@...il.com> Cc: Andrew Lunn <andrew@...n.ch>, Rob Herring <robh@...nel.org>, Petr Štetiar <ynezz@...e.cz>, linux-wireless@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: [PATCH net 5/5] net: wireless: mt76: fix similar warning reported by kbuild test robot 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: d31a36b5f407 ("net: wireless: support of_get_mac_address new ERR_PTR error") Reported-by: kbuild test robot <lkp@...el.com> Signed-off-by: Petr Štetiar <ynezz@...e.cz> --- drivers/net/wireless/mediatek/mt76/eeprom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/eeprom.c b/drivers/net/wireless/mediatek/mt76/eeprom.c index 04964937a3af..b7a49ae6b327 100644 --- a/drivers/net/wireless/mediatek/mt76/eeprom.c +++ b/drivers/net/wireless/mediatek/mt76/eeprom.c @@ -95,7 +95,7 @@ mac = of_get_mac_address(np); if (!IS_ERR(mac)) - memcpy(dev->macaddr, mac, ETH_ALEN); + ether_addr_copy(dev->macaddr, mac); #endif if (!is_valid_ether_addr(dev->macaddr)) { -- 1.9.1
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