Comment 0 for bug 2065857

    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:

       v5.15.156 upstream stable release
       from git://git.kernel.org/

Linux 5.15.156
drm/i915/cdclk: Fix CDCLK programming order when pipes are active
x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with CONFIG_MITIGATION_SPECTRE_BHI
x86/bugs: Remove CONFIG_BHI_MITIGATION_AUTO and spectre_bhi=auto
x86/bugs: Clarify that syscall hardening isn't a BHI mitigation
x86/bugs: Fix BHI handling of RRSBA
x86/bugs: Rename various 'ia32_cap' variables to 'x86_arch_cap_msr'
x86/bugs: Cache the value of MSR_IA32_ARCH_CAPABILITIES
x86/bugs: Fix BHI documentation
x86/bugs: Fix return type of spectre_bhi_state()
irqflags: Explicitly ignore lockdep_hrtimer_exit() argument
x86/apic: Force native_apic_mem_read() to use the MOV instruction
selftests: timers: Fix abs() warning in posix_timers test
x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n
perf/x86: Fix out of range data
vhost: Add smp_rmb() in vhost_vq_avail_empty()
drm/client: Fully protect modes[] with dev->mode_config.mutex
btrfs: qgroup: correctly model root qgroup rsv in convert
iommu/vt-d: Allocate local memory for page request queue
tracing: hide unused ftrace_event_id_fops
net: ena: Fix incorrect descriptor free behavior
net: ena: Wrong missing IO completions check order
net: ena: Fix potential sign extension issue
af_unix: Fix garbage collector racing against connect()
af_unix: Do not use atomic ops for unix_sk(sk)->inflight.
net: dsa: mt7530: trap link-local frames regardless of ST Port State
net: sparx5: fix wrong config being used when reconfiguring PCS
net/mlx5: Properly link new fs rules into the tree
netfilter: complete validation of user input
ipv6: fix race condition between ipv6_get_ifaddr and ipv6_del_addr
ipv4/route: avoid unused-but-set-variable warning
ipv6: fib: hide unused 'pn' variable
octeontx2-af: Fix NIX SQ mode and BP config
af_unix: Clear stale u->oob_skb.
geneve: fix header validation in geneve[6]_xmit_skb
xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING
u64_stats: Disable preemption on 32bit UP+SMP PREEMPT_RT during updates.
net: openvswitch: fix unwanted error log on timeout policy probing
scsi: qla2xxx: Fix off by one in qla_edif_app_getstats()
nouveau: fix function cast warning
Revert "drm/qxl: simplify qxl_fence_wait"
arm64: dts: imx8-ss-conn: fix usdhc wrong lpcg clock order
media: cec: core: remove length check of Timer Status
Bluetooth: Fix memory leak in hci_req_sync_complete()
ring-buffer: Only update pages_touched when a new page is touched
batman-adv: Avoid infinite loop trying to resize local TT