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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Also affects: linux-azure (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-azure-edge (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1747543

Title:
  [Hyper-V] linux-azure: PCI: hv: Do not sleep in compose_msi_msg()

Status in linux-azure package in Ubuntu:
  Confirmed
Status in linux-azure-edge package in Ubuntu:
  New
Status in linux-azure source package in Xenial:
  New
Status in linux-azure-edge source package in Xenial:
  New

Bug description:
  Part of the transparent SR-IOV series appears to be missing from 4.13.

  PCI: hv: Do not sleep in compose_msi_msg()

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=80bfeeb9dd6b54ac108c884c792f0fc7d4912bee

  The setup of MSI with Hyper-V host was sleeping with locks held.  This
  error is reported when doing SR-IOV hotplug with kernel built with lockdep:

      BUG: sleeping function called from invalid context at kernel/sched/completion.c:93
      in_atomic(): 1, irqs_disabled(): 1, pid: 1405, name: ip
      3 locks held by ip/1405:
     #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff976b10bb>] rtnetlink_rcv+0x1b/0x40
     #1:  (&desc->request_mutex){+.+...}, at: [<ffffffff970ddd33>] __setup_irq+0xb3/0x720
     #2:  (&irq_desc_lock_class){-.-...}, at: [<ffffffff970ddd65>] __setup_irq+0xe5/0x720
     irq event stamp: 3476
     hardirqs last  enabled at (3475): [<ffffffff971b3005>] get_page_from_freelist+0x225/0xc90
     hardirqs last disabled at (3476): [<ffffffff978024e7>] _raw_spin_lock_irqsave+0x27/0x90
     softirqs last  enabled at (2446): [<ffffffffc05ef0b0>] ixgbevf_configure+0x380/0x7c0 [ixgbevf]
     softirqs last disabled at (2444): [<ffffffffc05ef08d>] ixgbevf_configure+0x35d/0x7c0 [ixgbevf]

  The workaround is to poll for host response instead of blocking on
  completion.

  Please add this to linux-azure on 4.13.

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