Subject: Re: [PATCH 06/12] xen-blkfront: add callbacks for PM suspend and hibernation

From: kbuild test robot <[email-masked]>
Date: Wed, 20 May 2020 13:07:58 +0800

Hi Anchal,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR 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-rhel (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <[email-masked]>

All error/warnings (new ones prefixed by >>, old ones prefixed by <<):

drivers/block/xen-blkfront.c: In function 'blkfront_freeze':
>> drivers/block/xen-blkfront.c:2699:30: warning: missing terminating " character
xenbus_dev_error(dev, err, "Hibernation Failed.
^
>> drivers/block/xen-blkfront.c:2699:30: error: missing terminating " character
xenbus_dev_error(dev, err, "Hibernation Failed.
^~~~~~~~~~~~~~~~~~~~
>> drivers/block/xen-blkfront.c:2700:4: error: 'The' undeclared (first use in this function)
The ring is still busy");
^~~
drivers/block/xen-blkfront.c:2700:4: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/block/xen-blkfront.c:2700:8: error: expected ')' before 'ring'
The ring is still busy");
^~~~
drivers/block/xen-blkfront.c:2700:26: warning: missing terminating " character
The ring is still busy");
^
drivers/block/xen-blkfront.c:2700:26: error: missing terminating " character
The ring is still busy");
^~~
>> drivers/block/xen-blkfront.c:2704:2: error: expected ';' before '}' token
}
^

vim +2699 drivers/block/xen-blkfront.c

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

---
0-DAY CI Kernel Test Service, Intel Corporation
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