[kvalo-ath:pending 53/57] drivers/net/wireless/ath/ath11k/wmi.c:5657:3: warning: variable 'len' is uninitialized when used here

From: kernel test robot
Date: Tue Dec 14 2021 - 05:20:06 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git pending
head: 6cce4964a399f7eb43e75e57de0def72561a162c
commit: b368704018cc51a0908adf79649fd692624e75da [53/57] ath11k: report rssi of each chain to mac80211 for QCA6390/WCN6855
config: x86_64-randconfig-a003-20211213 (https://download.01.org/0day-ci/archive/20211214/202112141834.pliLIgBL-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?id=b368704018cc51a0908adf79649fd692624e75da
git remote add kvalo-ath https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git
git fetch --no-tags kvalo-ath pending
git checkout b368704018cc51a0908adf79649fd692624e75da
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/wireless/ath/ath11k/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/net/wireless/ath/ath11k/wmi.c:5657:3: warning: variable 'len' is uninitialized when used here [-Wuninitialized]
len -= sizeof(*src);
^~~
drivers/net/wireless/ath/ath11k/wmi.c:5637:9: note: initialize the variable 'len' to silence this warning
u32 len;
^
= 0
1 warning generated.


vim +/len +5657 drivers/net/wireless/ath/ath11k/wmi.c

b368704018cc51 Wen Gong 2021-12-13 5628
b368704018cc51 Wen Gong 2021-12-13 5629 static int ath11k_wmi_tlv_fw_stats_data_parse(struct ath11k_base *ab,
b368704018cc51 Wen Gong 2021-12-13 5630 struct wmi_tlv_fw_stats_parse *parse,
b368704018cc51 Wen Gong 2021-12-13 5631 const void *ptr)
b368704018cc51 Wen Gong 2021-12-13 5632 {
b368704018cc51 Wen Gong 2021-12-13 5633 struct ath11k_fw_stats *stats = parse->stats;
b368704018cc51 Wen Gong 2021-12-13 5634 const struct wmi_stats_event *ev = parse->ev;
b368704018cc51 Wen Gong 2021-12-13 5635 int i;
b368704018cc51 Wen Gong 2021-12-13 5636 const void *data = ptr;
b368704018cc51 Wen Gong 2021-12-13 5637 u32 len;
b368704018cc51 Wen Gong 2021-12-13 5638
b368704018cc51 Wen Gong 2021-12-13 5639 if (!ev) {
b368704018cc51 Wen Gong 2021-12-13 5640 ath11k_warn(ab, "failed to fetch update stats ev");
b368704018cc51 Wen Gong 2021-12-13 5641 return -EPROTO;
b368704018cc51 Wen Gong 2021-12-13 5642 }
d5c65159f28953 Kalle Valo 2019-11-23 5643
d5c65159f28953 Kalle Valo 2019-11-23 5644 stats->stats_id = 0;
d5c65159f28953 Kalle Valo 2019-11-23 5645
d5c65159f28953 Kalle Valo 2019-11-23 5646 for (i = 0; i < ev->num_pdev_stats; i++) {
d5c65159f28953 Kalle Valo 2019-11-23 5647 const struct wmi_pdev_stats *src;
d5c65159f28953 Kalle Valo 2019-11-23 5648 struct ath11k_fw_stats_pdev *dst;
d5c65159f28953 Kalle Valo 2019-11-23 5649
d5c65159f28953 Kalle Valo 2019-11-23 5650 src = data;
b368704018cc51 Wen Gong 2021-12-13 5651 if (len < sizeof(*src))
d5c65159f28953 Kalle Valo 2019-11-23 5652 return -EPROTO;
d5c65159f28953 Kalle Valo 2019-11-23 5653
d5c65159f28953 Kalle Valo 2019-11-23 5654 stats->stats_id = WMI_REQUEST_PDEV_STAT;
d5c65159f28953 Kalle Valo 2019-11-23 5655
d5c65159f28953 Kalle Valo 2019-11-23 5656 data += sizeof(*src);
d5c65159f28953 Kalle Valo 2019-11-23 @5657 len -= sizeof(*src);
d5c65159f28953 Kalle Valo 2019-11-23 5658
d5c65159f28953 Kalle Valo 2019-11-23 5659 dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
d5c65159f28953 Kalle Valo 2019-11-23 5660 if (!dst)
d5c65159f28953 Kalle Valo 2019-11-23 5661 continue;
d5c65159f28953 Kalle Valo 2019-11-23 5662
d5c65159f28953 Kalle Valo 2019-11-23 5663 ath11k_wmi_pull_pdev_stats_base(&src->base, dst);
d5c65159f28953 Kalle Valo 2019-11-23 5664 ath11k_wmi_pull_pdev_stats_tx(&src->tx, dst);
d5c65159f28953 Kalle Valo 2019-11-23 5665 ath11k_wmi_pull_pdev_stats_rx(&src->rx, dst);
d5c65159f28953 Kalle Valo 2019-11-23 5666 list_add_tail(&dst->list, &stats->pdevs);
d5c65159f28953 Kalle Valo 2019-11-23 5667 }
d5c65159f28953 Kalle Valo 2019-11-23 5668
d5c65159f28953 Kalle Valo 2019-11-23 5669 for (i = 0; i < ev->num_vdev_stats; i++) {
d5c65159f28953 Kalle Valo 2019-11-23 5670 const struct wmi_vdev_stats *src;
d5c65159f28953 Kalle Valo 2019-11-23 5671 struct ath11k_fw_stats_vdev *dst;
d5c65159f28953 Kalle Valo 2019-11-23 5672
d5c65159f28953 Kalle Valo 2019-11-23 5673 src = data;
b368704018cc51 Wen Gong 2021-12-13 5674 if (len < sizeof(*src))
d5c65159f28953 Kalle Valo 2019-11-23 5675 return -EPROTO;
d5c65159f28953 Kalle Valo 2019-11-23 5676
d5c65159f28953 Kalle Valo 2019-11-23 5677 stats->stats_id = WMI_REQUEST_VDEV_STAT;
d5c65159f28953 Kalle Valo 2019-11-23 5678
d5c65159f28953 Kalle Valo 2019-11-23 5679 data += sizeof(*src);
d5c65159f28953 Kalle Valo 2019-11-23 5680 len -= sizeof(*src);
d5c65159f28953 Kalle Valo 2019-11-23 5681
d5c65159f28953 Kalle Valo 2019-11-23 5682 dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
d5c65159f28953 Kalle Valo 2019-11-23 5683 if (!dst)
d5c65159f28953 Kalle Valo 2019-11-23 5684 continue;
d5c65159f28953 Kalle Valo 2019-11-23 5685
d5c65159f28953 Kalle Valo 2019-11-23 5686 ath11k_wmi_pull_vdev_stats(src, dst);
d5c65159f28953 Kalle Valo 2019-11-23 5687 list_add_tail(&dst->list, &stats->vdevs);
d5c65159f28953 Kalle Valo 2019-11-23 5688 }
d5c65159f28953 Kalle Valo 2019-11-23 5689
d5c65159f28953 Kalle Valo 2019-11-23 5690 for (i = 0; i < ev->num_bcn_stats; i++) {
d5c65159f28953 Kalle Valo 2019-11-23 5691 const struct wmi_bcn_stats *src;
d5c65159f28953 Kalle Valo 2019-11-23 5692 struct ath11k_fw_stats_bcn *dst;
d5c65159f28953 Kalle Valo 2019-11-23 5693
d5c65159f28953 Kalle Valo 2019-11-23 5694 src = data;
b368704018cc51 Wen Gong 2021-12-13 5695 if (len < sizeof(*src))
d5c65159f28953 Kalle Valo 2019-11-23 5696 return -EPROTO;
d5c65159f28953 Kalle Valo 2019-11-23 5697
d5c65159f28953 Kalle Valo 2019-11-23 5698 stats->stats_id = WMI_REQUEST_BCN_STAT;
d5c65159f28953 Kalle Valo 2019-11-23 5699
d5c65159f28953 Kalle Valo 2019-11-23 5700 data += sizeof(*src);
d5c65159f28953 Kalle Valo 2019-11-23 5701 len -= sizeof(*src);
d5c65159f28953 Kalle Valo 2019-11-23 5702
d5c65159f28953 Kalle Valo 2019-11-23 5703 dst = kzalloc(sizeof(*dst), GFP_ATOMIC);
d5c65159f28953 Kalle Valo 2019-11-23 5704 if (!dst)
d5c65159f28953 Kalle Valo 2019-11-23 5705 continue;
d5c65159f28953 Kalle Valo 2019-11-23 5706
d5c65159f28953 Kalle Valo 2019-11-23 5707 ath11k_wmi_pull_bcn_stats(src, dst);
d5c65159f28953 Kalle Valo 2019-11-23 5708 list_add_tail(&dst->list, &stats->bcn);
d5c65159f28953 Kalle Valo 2019-11-23 5709 }
d5c65159f28953 Kalle Valo 2019-11-23 5710
d5c65159f28953 Kalle Valo 2019-11-23 5711 return 0;
d5c65159f28953 Kalle Valo 2019-11-23 5712 }
d5c65159f28953 Kalle Valo 2019-11-23 5713

:::::: The code at line 5657 was first introduced by commit
:::::: d5c65159f2895379e11ca13f62feabe93278985d ath11k: driver for Qualcomm IEEE 802.11ax devices

:::::: TO: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
:::::: CC: Kalle Valo <kvalo@xxxxxxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx