Re: drivers/net/wireless/ti/wlcore/main.c:700:9: sparse: sparse: context imbalance in 'wlcore_irq' - different lock contexts for basic block

From: Tony Lindgren
Date: Mon Aug 17 2020 - 06:27:57 EST

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Hi,

* kernel test robot <lkp@xxxxxxxxx> [200811 11:55]:
> 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@xxxxxxxxx>
>
>
> 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
> >> drivers/net/wireless/ti/wlcore/main.c:700:9: sparse: sparse: context imbalance in 'wlcore_irq' - different lock contexts for basic block

I tried to reproduce this with cross compiling for ARM using sparse-0.6.2,
but don't see any similar warnings.

Is this only happening on mips for some reason?

Regards,

Tony

> 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@xxxxxxxxx>
> :::::: CC: John W. Linville <linville@xxxxxxxxxxxxx>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Next message: Borislav Petkov: "Re: [PATCH -next] RAS/CEC: Convert to DEFINE_SHOW_ATTRIBUTE"
Previous message: Kalle Valo: "Re: [PATCH] ath10k: Fix the size used in a 'dma_free_coherent()' call in an error handling path"
Next in thread: Chen, Rong A: "Re: [kbuild-all] Re: drivers/net/wireless/ti/wlcore/main.c:700:9: sparse: sparse: context imbalance in 'wlcore_irq' - different lock contexts for basic block"
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