Focal update: v5.4.248 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:

       v5.4.248 upstream stable release
       from git://git.kernel.org/

test_firmware: fix a memory leak with reqs buffer
KEYS: asymmetric: Copy sig and digest in public_key_verify_signature()
dasd: refactor dasd_ioctl_information
s390/dasd: Use correct lock while counting channel queue length
power: supply: ab8500: Fix external_power_changed race
power: supply: sc27xx: Fix external_power_changed race
power: supply: bq27xxx: Use mod_delayed_work() instead of cancel() + schedule()
ARM: dts: vexpress: add missing cache properties
power: supply: Ratelimit no data debug output
platform/x86: asus-wmi: Ignore WMI events with codes 0x7B, 0xC0
regulator: Fix error checking for debugfs_create_dir
irqchip/meson-gpio: Mark OF related data as maybe unused
power: supply: Fix logic checking if system is running from battery
btrfs: handle memory allocation failure in btrfs_csum_one_bio
parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu()
parisc: Flush gatt writes and adjust gatt mask in parisc_agp_mask_memory()
MIPS: Alchemy: fix dbdma2
mips: Move initrd_start check after initrd address sanitisation.
xen/blkfront: Only check REQ_FUA for writes
drm:amd:amdgpu: Fix missing buffer object unlock in failure path
ocfs2: fix use-after-free when unmounting read-only filesystem
ocfs2: check new file size on fallocate call
nios2: dts: Fix tse_mac "max-frame-size" property
nilfs2: fix incomplete buffer cleanup in nilfs_btnode_abort_change_key()
nilfs2: fix possible out-of-bounds segment allocation in resize ioctl
kexec: support purgatories with .text.hot sections
powerpc/purgatory: remove PGO flags
nouveau: fix client work fence deletion race
RDMA/uverbs: Restrict usage of privileged QKEYs
net: usb: qmi_wwan: add support for Compal RXM-G1
ALSA: hda/realtek: Add a quirk for Compaq N14JP6
Remove DECnet support from kernel
UBUNTU: [Config] updateconfigs DECnet
USB: serial: option: add Quectel EM061KGL series
serial: lantiq: add missing interrupt ack
usb: dwc3: gadget: Reset num TRBs before giving back the request
spi: spi-fsl-dspi: Remove unused chip->void_write_data
spi: fsl-dspi: avoid SCK glitches with continuous transfers
netfilter: nfnetlink: skip error delivery on batch in case of ENOMEM
ping6: Fix send to link-local addresses with VRF.
RDMA/rxe: Remove the unused variable obj
RDMA/rxe: Removed unused name from rxe_task struct
RDMA/rxe: Fix the use-before-initialization error of resp_pkts
iavf: remove mask from iavf_irq_enable_queues()
IB/uverbs: Fix to consider event queue closing also upon non-blocking mode
IB/isert: Fix dead lock in ib_isert
IB/isert: Fix possible list corruption in CMA handler
IB/isert: Fix incorrect release of isert connection
ipvlan: fix bound dev checking for IPv6 l3s mode
sctp: fix an error code in sctp_sf_eat_auth()
igb: fix nvm.ops.read() error handling
drm/nouveau/dp: check for NULL nv_connector->native_mode
drm/nouveau/kms: Don't change EDID when it hasn't actually changed
drm/nouveau: add nv_encoder pointer check for NULL
net/sched: cls_api: Fix lockup on flushing explicitly created chain
net: lapbether: only support ethernet devices
net: tipc: resize nlattr array to correct size
selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET
afs: Fix vlserver probe RTT handling
neighbour: Remove unused inline function neigh_key_eq16()
net: Remove unused inline function dst_hold_and_use()
neighbour: delete neigh_lookup_nodev as not used
drm/nouveau/kms: Fix NULL pointer dereference in nouveau_connector_detect_depth
mmc: block: ensure error propagation for non-blk
Linux 5.4.248
UBUNTU: Upstream stable to v5.4.248