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

From: kbuild test robot
Date: Sat May 23 2020 - 08:24:07 EST

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@xxxxxxxxx>


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

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