Focal update: v5.6.4 upstream stable release

[Timo Aaltonen]

    SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The following upstream
       stable patches should be included in the Ubuntu kernel:

       v5.6.4 upstream stable release
       from git://git.kernel.org/

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1008.8

---------------
linux-oem-5.6 (5.6.0-1008.8) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1008.8 -proposed tracker (LP: #1871932)

  * [SRU][F/U/OEM-5.6] UBUNTU: SAUCE: Fix amdgpu hang during acpi event
    (LP: #1871316)
    - SAUCE: drm/amdgpu: Fix oops when pp_funcs is unset in ACPI event

  * [TGL] graphics kernel support (LP: #1855399)
    - drm/i915: Polish WM_LINETIME register stuff
    - drm/i915: Move linetime wms into the crtc state
    - drm/i915: Nuke skl wm.dirty_pipes bitmask
    - drm/i915: Remove skl_ddl_allocation struct
    - drm/i915: Move dbuf slice update to proper place
    - drm/i915: Update dbuf slices only with full modeset
    - drm/i915: Introduce parameterized DBUF_CTL
    - drm/i915: Manipulate DBuf slices properly
    - drm/i915: Correctly map DBUF slices to pipes
    - drm/i915/display: Set TRANS_DDI_MODE_SELECT to default value when clearing
      DDI select
    - drm/i915: Ensure no conflicts with BIOS when updating Dbuf

  * Focal update: v5.6.4 upstream stable release (LP: #1872944)
    - ipv4: fix a RCU-list lock in fib_triestat_seq_show
    - net: dsa: ksz: Select KSZ protocol tag
    - net, ip_tunnel: fix interface lookup with no key
    - sctp: fix possibly using a bad saddr with a given dst
    - sctp: fix refcount bug in sctp_wfree
    - net: macb: Fix handling of fixed-link node
    - net: fix fraglist segmentation reference count leak
    - udp: initialize is_flist with 0 in udp_gro_receive
    - padata: fix uninitialized return value in padata_replace()
    - brcmfmac: abort and release host after error
    - XArray: Fix xa_find_next for large multi-index entries
    - drm/bridge: analogix-anx6345: Avoid duplicate -supply suffix
    - drm/i915/display: Fix mode private_flags comparison at atomic_check
    - misc: rtsx: set correct pcr_ops for rts522A
    - misc: pci_endpoint_test: Fix to support > 10 pci-endpoint-test devices
    - misc: pci_endpoint_test: Avoid using module parameter to determine irqtype
    - PCI: sysfs: Revert "rescan" file renames
    - coresight: do not use the BIT() macro in the UAPI header
    - mei: me: add cedar fork device ids
    - nvmem: release the write-protect pin
    - nvmem: check for NULL reg_read and reg_write before dereferencing
    - nvmem: sprd: Fix the block lock operation
    - extcon: axp288: Add wakeup support
    - power: supply: axp288_charger: Add special handling for HP Pavilion x2 10
    - Revert "ALSA: uapi: Drop asound.h inclusion from asoc.h"
    - Revert "dm: always call blk_queue_split() in dm_process_bio()"
    - ALSA: hda/ca0132 - Add Recon3Di quirk to handle integrated sound on EVGA X99
      Classified motherboard
    - soc: mediatek: knows_txdone needs to be set in Mediatek CMDQ helper
    - perf python: Fix clang detection to strip out options passed in $CC
    - mm: mempolicy: require at least one nodeid for MPOL_PREFERRED
    - Linux 5.6.3
    - cxgb4: fix MPS index overwrite when setting MAC address
    - ipv6: don't auto-add link-local address to lag ports
    - net: dsa: bcm_sf2: Do not register slave MDIO bus with OF
    - net: dsa: bcm_sf2: Ensure correct sub-no...