From: Arnd Bergmann Date: Mon, 24 Oct 2016 15:38:34 +0000 (+0200) Subject: staging: rtl8192x: fix bogus maybe-uninitialized warning X-Git-Tag: v4.14-rc1~1919^2~490 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5d43dfdba0e377c22fdd69e5d7b3e361c77348bb;p=platform%2Fkernel%2Flinux-rpi.git staging: rtl8192x: fix bogus maybe-uninitialized warning The rtllib_rx_extract_addr() 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/staging/rtl8192e/rtllib_rx.c: In function ‘rtllib_rx_InfraAdhoc’: include/linux/etherdevice.h:316:61: error: ‘*((void *)&dst+4)’ may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/staging/rtl8192e/rtllib_rx.c:1318:5: note: ‘*((void *)&dst+4)’ was declared here ded from /git/arm-soc/drivers/staging/rtl8192e/rtllib_rx.c:40:0: include/linux/etherdevice.h:316:36: error: ‘dst’ may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/staging/rtl8192e/rtllib_rx.c:1318:5: note: ‘dst’ was declared here 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. As the same warning appears in other files that have the exact same code, I'm fixing it in both rtl8192e and rtl8192u, even though I did not observe it for the latter. Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/rtl8192e/rtllib_rx.c b/drivers/staging/rtl8192e/rtllib_rx.c index c743182..d6777ec 100644 --- a/drivers/staging/rtl8192e/rtllib_rx.c +++ b/drivers/staging/rtl8192e/rtllib_rx.c @@ -986,7 +986,7 @@ static void rtllib_rx_extract_addr(struct rtllib_device *ieee, ether_addr_copy(src, hdr->addr4); ether_addr_copy(bssid, ieee->current_network.bssid); break; - case 0: + default: ether_addr_copy(dst, hdr->addr1); ether_addr_copy(src, hdr->addr2); ether_addr_copy(bssid, hdr->addr3); diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c index 6fa96d5..e688508 100644 --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c @@ -553,7 +553,7 @@ static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr) memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */ break; - case 0: + default: memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ break; diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c index 89cbc07..2e4d2d7 100644 --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c @@ -1079,7 +1079,7 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, memcpy(src, hdr->addr4, ETH_ALEN); memcpy(bssid, ieee->current_network.bssid, ETH_ALEN); break; - case 0: + default: memcpy(dst, hdr->addr1, ETH_ALEN); memcpy(src, hdr->addr2, ETH_ALEN); memcpy(bssid, hdr->addr3, ETH_ALEN);