Focal update: v5.4.27 upstream stable release

    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:

       v5.4.27 upstream stable release
       from git://git.kernel.org/

Linux 5.4.27
ipv4: ensure rcu_read_lock() in cipso_v4_error()
ARM: 8961/2: Fix Kbuild issue caused by per-task stack protector GCC plugin
HID: add ALWAYS_POLL quirk to lenovo pixart mouse
HID: google: add moonball USB id
mm: slub: add missing TID bump in kmem_cache_alloc_bulk()
ARM: 8958/1: rename missed uaccess .fixup section
ARM: 8957/1: VDSO: Match ARMv8 timer in cntvct_functional()
net: qrtr: fix len of skb_put_padto in qrtr_node_enqueue
blk-mq: insert flush request to the front of dispatch queue
jbd2: fix data races at struct journal_head
sfc: fix timestamp reconstruction at 16-bit rollover points
net: rmnet: fix packet forwarding in rmnet bridge mode
net: rmnet: fix bridge mode bugs
net: rmnet: use upper/lower device infrastructure
net: rmnet: do not allow to change mux id if mux id is duplicated
net: rmnet: remove rcu_read_lock in rmnet_force_unassociate_device()
net: rmnet: fix suspicious RCU usage
net: rmnet: fix NULL pointer dereference in rmnet_changelink()
net: rmnet: fix NULL pointer dereference in rmnet_newlink()
hinic: fix a bug of rss configuration
hinic: fix a bug of setting hw_ioctxt
hinic: fix a irq affinity bug
net: phy: mscc: fix firmware paths
slip: not call free_netdev before rtnl_unlock in slip_open
signal: avoid double atomic counter increments for user accounting
kbuild: add dt_binding_check to PHONY in a correct place
kbuild: add dtbs_check to PHONY
drm/amdgpu: fix memory leak during TDR test(v2)
blk-mq: insert passthrough request into hctx->dispatch directly
net: ll_temac: Handle DMA halt condition caused by buffer underrun
net: ll_temac: Fix RX buffer descriptor handling on GFP_ATOMIC pressure
net: ll_temac: Add more error handling of dma_map_single() calls
net: ll_temac: Fix race condition causing TX hang
mac80211: rx: avoid RCU list traversal under mutex
net: ks8851-ml: Fix IRQ handling and locking
net: usb: qmi_wwan: restore mtu min/max values after raw_ip switch
scsi: libfc: free response frame from GPN_ID
cfg80211: check reg_rule for NULL in handle_channel_custom()
tracing: Fix number printing bug in print_synth_event()
selftests/rseq: Fix out-of-tree compilation
HID: hid-bigbenff: fix race condition for scheduled work during removal
HID: hid-bigbenff: call hid_hw_stop() in case of error
HID: hid-bigbenff: fix general protection fault caused by double kfree
HID: i2c-hid: add Trekstor Surfbook E11B to descriptor override
ACPI: watchdog: Set default timeout in probe
HID: apple: Add support for recent firmware on Magic Keyboards
ACPI: watchdog: Allow disabling WDAT at boot
drm/amdgpu: Fix TLB invalidation request when using semaphore
netfilter: xt_hashlimit: unregister proc file before releasing mutex
netfilter: hashlimit: do not use indirect calls during gc