group.of.nepali.translators team mailing list archive

[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

https://lists.ubuntu.com/archives/kernel-team/2016-July/078752.html

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

** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
       Status: New

** Changed in: linux (Ubuntu Yakkety)
     Assignee: Taco Screen team (taco-screen-team) => (unassigned)

** Changed in: linux (Ubuntu Yakkety)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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https://bugs.launchpad.net/bugs/1599250

Title:
  Hotplug device addition issue - missing patches on Xenial kernel

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  == Comment: #0 - Guilherme Guaglianoni Piccoli - 2016-06-29 18:09:04 ==
  When performing hotplug device addition to LPAR/guest with Ubuntu 16.04 (kernel 4.4.0-28) we can observe a kernel oops if device makes use of 64-bit DDW DMA. The following stack trace was observed with QLogic NIC (bnx2x driver):

  
  [  131.52] --- interrupt: 300 at enable_ddw+0x254/0x7c0
                     LR = enable_ddw+0x238/0x7c0
  [  131.52] [c0000001fbc67480] [c000000000089b88] dma_set_mask_pSeriesLP+0x208/0x290
  [  131.52] [c0000001fbc67510] [c0000000000246b8] dma_set_mask+0x58/0xf0
  [  131.52] [c0000001fbc67540] [d00000000387a654] bnx2x_init_one+0x504/0x10f0 [bnx2x]
  [  131.52] [c0000001fbc67620] [c0000000005e4eac] local_pci_probe+0x6c/0x140
  [  131.52] [c0000001fbc676b0] [c0000000005e5d58] pci_device_probe+0x168/0x200
  [  131.52] [c0000001fbc67710] [c0000000006d2530] driver_probe_device+0x1f0/0x610
  [  131.52] [c0000001fbc677a0] [c0000000006d2a6c] __driver_attach+0x11c/0x120
  [  131.52] [c0000001fbc677e0] [c0000000006ceeac] bus_for_each_dev+0x9c/0x110
  [  131.52] [c0000001fbc67830] [c0000000006d198c] driver_attach+0x3c/0x60
  [  131.52] [c0000001fbc67860] [c0000000006d1278] bus_add_driver+0x2d8/0x390
  [  131.52] [c0000001fbc678f0] [c0000000006d39dc] driver_register+0x9c/0x180
  [  131.52] [c0000001fbc67960] [c0000000005e401c] __pci_register_driver+0x6c/0x90

  
  This issue is solved upstream, by the following 3 patches (SHA-1 from Linus tree):

  c2078d9ef60 ("Revert \"powerpc/eeh: Fix crash in eeh_add_device_early() on Cell\"")
  8445a87f709 ("powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism")
  8a934efe943 ("powerpc/pseries: Fix PCI config address for DDW")

  
  So, we want to request the addition of these fixes in Ubuntu Xenial kernel.
  Besides, an old and obsolete non-upstream patch related to this issue can be removed (SHA-1 from Ubuntu xenial tree):

  623aabd5d68 ("UBUNTU: SAUCE: powerpc/eeh: Validate arch in
  eeh_add_device_early()")

  
  Thanks,

  Guilherme

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