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Date:   Sat, 23 May 2020 20:32:16 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Anchal Agarwal <anchalag@...zon.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        linux-pm@...r.kernel.org, linux-mm@...ck.org, kamatam@...zon.com,
        sstabellini@...nel.org, konrad.wilk@...cle.com,
        roger.pau@...rix.com, axboe@...nel.dk, davem@...emloft.net,
        rjw@...ysocki.net, len.brown@...el.com, pavel@....cz,
        peterz@...radead.org, eduval@...zon.com, sblbir@...zon.com,
        xen-devel@...ts.xenproject.org, vkuznets@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dwmw@...zon.co.uk, benh@...nel.crashing.org
Cc:     kbuild-all@...ts.01.org
Subject: Re: [PATCH 06/12] xen-blkfront: add callbacks for PM suspend and
 hibernation

Hi Anchal,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.7-rc6]
[cannot apply to xen-tip/linux-next tip/irq/core tip/auto-latest next-20200519]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Anchal-Agarwal/Fix-PM-hibernation-in-Xen-guests/20200520-073211
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 03fb3acae4be8a6b680ffedb220a8b6c07260b40
config: x86_64-allmodconfig (attached as .config)
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-193-gb8fad4bc-dirty
        # save the attached .config to linux build tree
        make C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
:::::: branch date: 11 hours ago
:::::: commit date: 11 hours ago

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/block/xen-blkfront.c:2700:0: sparse: sparse: missing terminating " character
   drivers/block/xen-blkfront.c:2701:0: sparse: sparse: missing terminating " character
   drivers/block/xen-blkfront.c:2700:25: sparse: sparse: Expected ) in function call
   drivers/block/xen-blkfront.c:2700:25: sparse: sparse: got The

# https://github.com/0day-ci/linux/commit/1997467d18e784a64ee0fe00875492e9605f6147
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 1997467d18e784a64ee0fe00875492e9605f6147
vim +2700 drivers/block/xen-blkfront.c

9f27ee59503865 Jeremy Fitzhardinge 2007-07-17  2672  
1997467d18e784 Munehisa Kamata     2020-05-19  2673  static int blkfront_freeze(struct xenbus_device *dev)
1997467d18e784 Munehisa Kamata     2020-05-19  2674  {
1997467d18e784 Munehisa Kamata     2020-05-19  2675  	unsigned int i;
1997467d18e784 Munehisa Kamata     2020-05-19  2676  	struct blkfront_info *info = dev_get_drvdata(&dev->dev);
1997467d18e784 Munehisa Kamata     2020-05-19  2677  	struct blkfront_ring_info *rinfo;
1997467d18e784 Munehisa Kamata     2020-05-19  2678  	/* This would be reasonable timeout as used in xenbus_dev_shutdown() */
1997467d18e784 Munehisa Kamata     2020-05-19  2679  	unsigned int timeout = 5 * HZ;
1997467d18e784 Munehisa Kamata     2020-05-19  2680  	unsigned long flags;
1997467d18e784 Munehisa Kamata     2020-05-19  2681  	int err = 0;
1997467d18e784 Munehisa Kamata     2020-05-19  2682  
1997467d18e784 Munehisa Kamata     2020-05-19  2683  	info->connected = BLKIF_STATE_FREEZING;
1997467d18e784 Munehisa Kamata     2020-05-19  2684  
1997467d18e784 Munehisa Kamata     2020-05-19  2685  	blk_mq_freeze_queue(info->rq);
1997467d18e784 Munehisa Kamata     2020-05-19  2686  	blk_mq_quiesce_queue(info->rq);
1997467d18e784 Munehisa Kamata     2020-05-19  2687  
1997467d18e784 Munehisa Kamata     2020-05-19  2688  	for_each_rinfo(info, rinfo, i) {
1997467d18e784 Munehisa Kamata     2020-05-19  2689  	    /* No more gnttab callback work. */
1997467d18e784 Munehisa Kamata     2020-05-19  2690  	    gnttab_cancel_free_callback(&rinfo->callback);
1997467d18e784 Munehisa Kamata     2020-05-19  2691  	    /* Flush gnttab callback work. Must be done with no locks held. */
1997467d18e784 Munehisa Kamata     2020-05-19  2692  	    flush_work(&rinfo->work);
1997467d18e784 Munehisa Kamata     2020-05-19  2693  	}
1997467d18e784 Munehisa Kamata     2020-05-19  2694  
1997467d18e784 Munehisa Kamata     2020-05-19  2695  	for_each_rinfo(info, rinfo, i) {
1997467d18e784 Munehisa Kamata     2020-05-19  2696  	    spin_lock_irqsave(&rinfo->ring_lock, flags);
1997467d18e784 Munehisa Kamata     2020-05-19  2697  	    if (RING_FULL(&rinfo->ring)
1997467d18e784 Munehisa Kamata     2020-05-19  2698  		    || RING_HAS_UNCONSUMED_RESPONSES(&rinfo->ring)) {
1997467d18e784 Munehisa Kamata     2020-05-19  2699  		xenbus_dev_error(dev, err, "Hibernation Failed.
1997467d18e784 Munehisa Kamata     2020-05-19 @2700  			The ring is still busy");
1997467d18e784 Munehisa Kamata     2020-05-19  2701  		info->connected = BLKIF_STATE_CONNECTED;
1997467d18e784 Munehisa Kamata     2020-05-19  2702  		spin_unlock_irqrestore(&rinfo->ring_lock, flags);
1997467d18e784 Munehisa Kamata     2020-05-19  2703  		return -EBUSY;
1997467d18e784 Munehisa Kamata     2020-05-19  2704  	}
1997467d18e784 Munehisa Kamata     2020-05-19  2705  	    spin_unlock_irqrestore(&rinfo->ring_lock, flags);
1997467d18e784 Munehisa Kamata     2020-05-19  2706  	}
1997467d18e784 Munehisa Kamata     2020-05-19  2707  	/* Kick the backend to disconnect */
1997467d18e784 Munehisa Kamata     2020-05-19  2708  	xenbus_switch_state(dev, XenbusStateClosing);
1997467d18e784 Munehisa Kamata     2020-05-19  2709  
1997467d18e784 Munehisa Kamata     2020-05-19  2710  	/*
1997467d18e784 Munehisa Kamata     2020-05-19  2711  	 * We don't want to move forward before the frontend is diconnected
1997467d18e784 Munehisa Kamata     2020-05-19  2712  	 * from the backend cleanly.
1997467d18e784 Munehisa Kamata     2020-05-19  2713  	 */
1997467d18e784 Munehisa Kamata     2020-05-19  2714  	timeout = wait_for_completion_timeout(&info->wait_backend_disconnected,
1997467d18e784 Munehisa Kamata     2020-05-19  2715  					      timeout);
1997467d18e784 Munehisa Kamata     2020-05-19  2716  	if (!timeout) {
1997467d18e784 Munehisa Kamata     2020-05-19  2717  		err = -EBUSY;
1997467d18e784 Munehisa Kamata     2020-05-19  2718  		xenbus_dev_error(dev, err, "Freezing timed out;"
1997467d18e784 Munehisa Kamata     2020-05-19  2719  				 "the device may become inconsistent state");
1997467d18e784 Munehisa Kamata     2020-05-19  2720  	}
1997467d18e784 Munehisa Kamata     2020-05-19  2721  
1997467d18e784 Munehisa Kamata     2020-05-19  2722  	return err;
1997467d18e784 Munehisa Kamata     2020-05-19  2723  }
1997467d18e784 Munehisa Kamata     2020-05-19  2724  

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

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