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SubjectRe: [PATCH 06/12] xen-blkfront: add callbacks for PM suspend and hibernation
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 <lkp@intel.com>

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
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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