+ linux-wireless kbuild test robot <lkp@xxxxxxxxx> writes: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git pending > head: 6e56895b48f885973e44231cac5f3f39a7068d36 > commit: 18c7c63dcc54feb0e0438ff20b528ea3945d82e0 [12/32] wil6210: remove rtap_include_phy_info module param > config: xtensa-allyesconfig (attached as .config) > compiler: xtensa-linux-gcc (GCC) 8.2.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > git checkout 18c7c63dcc54feb0e0438ff20b528ea3945d82e0 > # save the attached .config to linux build tree > GCC_VERSION=8.2.0 make.cross ARCH=xtensa > > Note: it may well be a FALSE warning. FWIW you are at least aware of it now. > http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings > > All warnings (new ones prefixed by >>): > > drivers/net/wireless/ath/wil6210/txrx.c: In function 'wil_vring_reap_rx': >>> drivers/net/wireless/ath/wil6210/txrx.c:341:25: warning: 'rtap' may be used uninitialized in this function [-Wmaybe-uninitialized] > rtap->rthdr.it_version = PKTHDR_RADIOTAP_VERSION; > drivers/net/wireless/ath/wil6210/txrx.c:331:23: note: 'rtap' was declared here > struct wil6210_rtap *rtap; > ^~~~ > > vim +/rtap +341 drivers/net/wireless/ath/wil6210/txrx.c > > 304 > 305 /** > 306 * Adds radiotap header > 307 * > 308 * Any error indicated as "Bad FCS" > 309 * > 310 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of: > 311 * - Rx descriptor: 32 bytes > 312 * - Phy info > 313 */ > 314 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil, > 315 struct sk_buff *skb) > 316 { > 317 struct wil6210_rtap { > 318 struct ieee80211_radiotap_header rthdr; > 319 /* fields should be in the order of bits in rthdr.it_present */ > 320 /* flags */ > 321 u8 flags; > 322 /* channel */ > 323 __le16 chnl_freq __aligned(2); > 324 __le16 chnl_flags; > 325 /* MCS */ > 326 u8 mcs_present; > 327 u8 mcs_flags; > 328 u8 mcs_index; > 329 } __packed; This is an odd place to define a structure. > 330 struct vring_rx_desc *d = wil_skb_rxdesc(skb); > 331 struct wil6210_rtap *rtap; > 332 int rtap_len = sizeof(struct wil6210_rtap); > 333 struct ieee80211_channel *ch = wil->monitor_chandef.chan; > 334 > 335 if (skb_headroom(skb) < rtap_len && > 336 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) { > 337 wil_err(wil, "Unable to expand headroom to %d\n", rtap_len); > 338 return; > 339 } > 340 > > 341 rtap->rthdr.it_version = PKTHDR_RADIOTAP_VERSION; Looks like a valid warning to me. -- Kalle Valo
