From 10f3366b4d894ac6eb9f31931bd4c99895935f26 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 24 Oct 2016 17:38:35 +0200 Subject: wireless: fix bogus maybe-uninitialized warning The hostap_80211_rx() function is supposed to set up the mac addresses for four possible cases, based on two bits of input data. For some reason, gcc decides that it's possible that none of the these four cases apply and the addresses remain uninitialized: drivers/net/wireless/intersil/hostap/hostap_80211_rx.c: In function ‘hostap_80211_rx’: arch/x86/include/asm/string_32.h:77:14: warning: ‘src’ may be used uninitialized in this function [-Wmaybe-uninitialized] drivers/net/wireless/intel/ipw2x00/libipw_rx.c: In function ‘libipw_rx’: arch/x86/include/asm/string_32.h:77:14: error: ‘dst’ may be used uninitialized in this function [-Werror=maybe-uninitialized] arch/x86/include/asm/string_32.h:78:22: error: ‘*((void *)&dst+4)’ may be used uninitialized in this function [-Werror=maybe-uninitialized] This warning is clearly nonsense, but changing the last case into 'default' makes it obvious to the compiler too, which avoids the warning and probably leads to better object code too. The same code is duplicated several times in the kernel, so this patch uses the same workaround for all copies. The exact configuration was hit only very rarely in randconfig builds and I only saw it in three drivers, but I assume that all of them are potentially affected, and it's better to keep the code consistent. Signed-off-by: Arnd Bergmann Signed-off-by: Kalle Valo --- drivers/net/wireless/intersil/hostap/hostap_80211_rx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/wireless/intersil') diff --git a/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c b/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c index 599f30f22841..34dbddbf3f9b 100644 --- a/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c +++ b/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c @@ -855,7 +855,7 @@ void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb, memcpy(dst, hdr->addr3, ETH_ALEN); memcpy(src, hdr->addr4, ETH_ALEN); break; - case 0: + default: memcpy(dst, hdr->addr1, ETH_ALEN); memcpy(src, hdr->addr2, ETH_ALEN); break; -- cgit v1.2.3-55-g7522