drivers/net/wwan/iosm/iosm_ipc_mux_codec.c:833:21: sparse: sparse: Using plain integer as NULL pointer

kernel test robot
2022-07-16T00:49:00Z

head: 9b59ec8d50a1f28747ceff9a4f39af5deba9540e
commit: 89212e160b81e778f829b89743570665810e3b13 net: wwan: Fix WWAN config symbols
date: 1 year, 1 month ago
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20220716/202207160836.RlSIXAvl-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=89212e160b81e778f829b89743570665810e3b13
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 89212e160b81e778f829b89743570665810e3b13
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/net/wwan/iosm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

sparse warnings: (new ones prefixed by >>)
>> drivers/net/wwan/iosm/iosm_ipc_mux_codec.c:833:21: sparse: sparse: Using plain integer as NULL pointer

vim +833 drivers/net/wwan/iosm/iosm_ipc_mux_codec.c

9413491e20e1aba M Chetan Kumar 2021-06-13 814
9413491e20e1aba M Chetan Kumar 2021-06-13 815 void ipc_mux_ul_encoded_process(struct iosm_mux *ipc_mux, struct sk_buff *skb)
9413491e20e1aba M Chetan Kumar 2021-06-13 816 {
9413491e20e1aba M Chetan Kumar 2021-06-13 817 struct mux_adgh *adgh;
9413491e20e1aba M Chetan Kumar 2021-06-13 818 u16 adgh_len;
9413491e20e1aba M Chetan Kumar 2021-06-13 819
9413491e20e1aba M Chetan Kumar 2021-06-13 820 adgh = (struct mux_adgh *)skb->data;
9413491e20e1aba M Chetan Kumar 2021-06-13 821 adgh_len = le16_to_cpu(adgh->length);
9413491e20e1aba M Chetan Kumar 2021-06-13 822
9413491e20e1aba M Chetan Kumar 2021-06-13 823 if (adgh->signature == cpu_to_le32(MUX_SIG_ADGH) &&
9413491e20e1aba M Chetan Kumar 2021-06-13 824 ipc_mux->ul_flow == MUX_UL)
9413491e20e1aba M Chetan Kumar 2021-06-13 825 ipc_mux->ul_data_pend_bytes = ipc_mux->ul_data_pend_bytes -
9413491e20e1aba M Chetan Kumar 2021-06-13 826 adgh_len;
9413491e20e1aba M Chetan Kumar 2021-06-13 827
9413491e20e1aba M Chetan Kumar 2021-06-13 828 if (ipc_mux->ul_flow == MUX_UL)
9413491e20e1aba M Chetan Kumar 2021-06-13 829 dev_dbg(ipc_mux->dev, "ul_data_pend_bytes: %lld",
9413491e20e1aba M Chetan Kumar 2021-06-13 830 ipc_mux->ul_data_pend_bytes);
9413491e20e1aba M Chetan Kumar 2021-06-13 831
9413491e20e1aba M Chetan Kumar 2021-06-13 832 /* Reset the skb settings. */
9413491e20e1aba M Chetan Kumar 2021-06-13 @833 skb->tail = 0;
9413491e20e1aba M Chetan Kumar 2021-06-13 834 skb->len = 0;
9413491e20e1aba M Chetan Kumar 2021-06-13 835
9413491e20e1aba M Chetan Kumar 2021-06-13 836 /* Add the consumed ADB to the free list. */
9413491e20e1aba M Chetan Kumar 2021-06-13 837 skb_queue_tail((&ipc_mux->ul_adb.free_list), skb);
9413491e20e1aba M Chetan Kumar 2021-06-13 838 }
9413491e20e1aba M Chetan Kumar 2021-06-13 839