tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 00e4db51259a5f936fec1424b884f029479d3981 commit: 35fba0f0fd762a8b87d403ae3c723e0061c4aa25 wlcore: Use spin_trylock in wlcore_irq() to see if we need to queue tx date: 4 weeks ago config: mips-randconfig-s032-20200811 (attached as .config) compiler: mips64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-168-g9554805c-dirty git checkout 35fba0f0fd762a8b87d403ae3c723e0061c4aa25 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/net/wireless/ti/wlcore/main.c:643:34: sparse: sparse: context imbalance in 'wlcore_irq_locked' - different lock contexts for basic block vim +/wlcore_irq +700 drivers/net/wireless/ti/wlcore/main.c b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 649 b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 650 static irqreturn_t wlcore_irq(int irq, void *cookie) b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 651 { b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 652 int ret; b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 653 unsigned long flags; b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 654 struct wl1271 *wl = cookie; 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 655 bool queue_tx_work = true; b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 656 eb215c33f308ce drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 657 set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags); eb215c33f308ce drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 658 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 659 /* complete the ELP completion */ eb215c33f308ce drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 660 if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) { 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 661 spin_lock_irqsave(&wl->wl_lock, flags); eb215c33f308ce drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 662 if (wl->elp_compl) 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 663 complete(wl->elp_compl); eb215c33f308ce drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 664 spin_unlock_irqrestore(&wl->wl_lock, flags); 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 665 } 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 666 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 667 if (test_bit(WL1271_FLAG_SUSPENDED, &wl->flags)) { 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 668 /* don't enqueue a work right now. mark it as pending */ 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 669 set_bit(WL1271_FLAG_PENDING_WORK, &wl->flags); 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 670 wl1271_debug(DEBUG_IRQ, "should not enqueue work"); eb215c33f308ce drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 671 spin_lock_irqsave(&wl->wl_lock, flags); 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 672 disable_irq_nosync(wl->irq); 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 673 pm_wakeup_event(wl->dev, 0); 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 674 spin_unlock_irqrestore(&wl->wl_lock, flags); 4633d30b61ac14 drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2019-10-09 675 goto out_handled; 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 676 } 97236a0656034e drivers/net/wireless/ti/wlcore/main.c Luciano Coelho 2013-03-08 677 b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 678 /* TX might be handled here, avoid redundant work */ b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 679 set_bit(WL1271_FLAG_TX_PENDING, &wl->flags); b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 680 cancel_work_sync(&wl->tx_work); b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 681 b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 682 mutex_lock(&wl->mutex); b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 683 b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 684 ret = wlcore_irq_locked(wl); b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 685 if (ret) b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 686 wl12xx_queue_recovery_work(wl); b5b45b3cbd5616 drivers/net/wireless/ti/wlcore/main.c Arik Nemtsov 2012-06-21 687 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 688 /* In case TX was not handled in wlcore_irq_locked(), queue TX work */ b07d4037051318 drivers/net/wireless/wl12xx/main.c Ido Yariv 2011-03-01 689 clear_bit(WL1271_FLAG_TX_PENDING, &wl->flags); 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 690 if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags)) { 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 691 if (spin_trylock_irqsave(&wl->wl_lock, flags)) { 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 692 if (!wl1271_tx_total_queue_count(wl)) 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 693 queue_tx_work = false; b07d4037051318 drivers/net/wireless/wl12xx/main.c Ido Yariv 2011-03-01 694 spin_unlock_irqrestore(&wl->wl_lock, flags); 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 695 } 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 696 if (queue_tx_work) 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 697 ieee80211_queue_work(wl->hw, &wl->tx_work); 35fba0f0fd762a drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2020-07-02 698 } b07d4037051318 drivers/net/wireless/wl12xx/main.c Ido Yariv 2011-03-01 699 f5fc0f86b02afe drivers/net/wireless/wl12xx/wl1271_main.c Luciano Coelho 2009-08-06 @700 mutex_unlock(&wl->mutex); a620865edf62ea drivers/net/wireless/wl12xx/main.c Ido Yariv 2011-03-01 701 4633d30b61ac14 drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2019-10-09 702 out_handled: 4633d30b61ac14 drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2019-10-09 703 spin_lock_irqsave(&wl->wl_lock, flags); 4633d30b61ac14 drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2019-10-09 704 clear_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags); 4633d30b61ac14 drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2019-10-09 705 spin_unlock_irqrestore(&wl->wl_lock, flags); 4633d30b61ac14 drivers/net/wireless/ti/wlcore/main.c Tony Lindgren 2019-10-09 706 a620865edf62ea drivers/net/wireless/wl12xx/main.c Ido Yariv 2011-03-01 707 return IRQ_HANDLED; f5fc0f86b02afe drivers/net/wireless/wl12xx/wl1271_main.c Luciano Coelho 2009-08-06 708 } f5fc0f86b02afe drivers/net/wireless/wl12xx/wl1271_main.c Luciano Coelho 2009-08-06 709 :::::: The code at line 700 was first introduced by commit :::::: f5fc0f86b02afef1119b523623b4cde41475bc8c wl1271: add wl1271 driver files :::::: TO: Luciano Coelho <luciano.coelho(a)nokia.com&gt; :::::: CC: John W. Linville <linville(a)tuxdriver.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org