Merge android-4.4.144 (4b2d6ba) into msm-4.4

* refs/heads/tmp-4b2d6ba
  Linux 4.4.144
  ubi: fastmap: Erase outdated anchor PEBs during attach
  ubi: Fix Fastmap's update_vol()
  ubi: Fix races around ubi_refill_pools()
  ubi: Be more paranoid while seaching for the most recent Fastmap
  ubi: Rework Fastmap attach base code
  ubi: Introduce vol_ignored()
  clk: tegra: Fix PLL_U post divider and initial rate on Tegra30
  block: do not use interruptible wait anywhere
  x86/cpu: Re-apply forced caps every time CPU caps are re-read
  x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths
  x86/bugs: Rename SSBD_NO to SSB_NO
  x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG
  x86/bugs: Rework spec_ctrl base and mask logic
  x86/bugs: Remove x86_spec_ctrl_set()
  x86/bugs: Expose x86_spec_ctrl_base directly
  x86/bugs: Unify x86_spec_ctrl_{set_guest, restore_host}
  x86/speculation: Rework speculative_store_bypass_update()
  x86/speculation: Add virtualized speculative store bypass disable support
  x86/bugs, KVM: Extend speculation control for VIRT_SPEC_CTRL
  x86/speculation: Handle HT correctly on AMD
  x86/cpufeatures: Add FEATURE_ZEN
  x86/cpu/AMD: Fix erratum 1076 (CPB bit)
  x86/cpufeatures: Disentangle SSBD enumeration
  x86/cpufeatures: Disentangle MSR_SPEC_CTRL enumeration from IBRS
  x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP
  x86/cpu: Make alternative_msr_write work for 32-bit code
  x86/bugs: Fix the parameters alignment and missing void
  x86/bugs: Make cpu_show_common() static
  x86/bugs: Fix __ssb_select_mitigation() return type
  Documentation/spec_ctrl: Do some minor cleanups
  proc: Use underscores for SSBD in 'status'
  x86/bugs: Rename _RDS to _SSBD
  x86/speculation: Make "seccomp" the default mode for Speculative Store Bypass
  seccomp: Move speculation migitation control to arch code
  seccomp: Add filter flag to opt-out of SSB mitigation
  seccomp: Use PR_SPEC_FORCE_DISABLE
  prctl: Add force disable speculation
  seccomp: Enable speculation flaw mitigations
  proc: Provide details on speculation flaw mitigations
  nospec: Allow getting/setting on non-current task
  x86/speculation: Add prctl for Speculative Store Bypass mitigation
  x86/process: Allow runtime control of Speculative Store Bypass
  x86/process: Optimize TIF_NOTSC switch
  x86/process: Correct and optimize TIF_BLOCKSTEP switch
  x86/process: Optimize TIF checks in __switch_to_xtra()
  prctl: Add speculation control prctls
  x86/speculation: Create spec-ctrl.h to avoid include hell
  x86/bugs/AMD: Add support to disable RDS on Fam[15, 16, 17]h if requested
  x86/bugs: Whitelist allowed SPEC_CTRL MSR values
  x86/bugs/intel: Set proper CPU features and setup RDS
  x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation
  x86/cpufeatures: Add X86_FEATURE_RDS
  x86/bugs: Expose /sys/../spec_store_bypass
  x86/cpu/intel: Add Knights Mill to Intel family
  x86/cpu: Rename Merrifield2 to Moorefield
  x86/bugs, KVM: Support the combination of guest and host IBRS
  x86/bugs: Read SPEC_CTRL MSR during boot and re-use reserved bits
  x86/bugs: Concentrate bug reporting into a separate function
  x86/bugs: Concentrate bug detection into a separate function
  x86/nospec: Simplify alternative_msr_write()
  x86/amd: don't set X86_BUG_SYSRET_SS_ATTRS when running under Xen
  xen: set cpu capabilities from xen_start_kernel()
  selftest/seccomp: Fix the seccomp(2) signature
  selftest/seccomp: Fix the flag name SECCOMP_FILTER_FLAG_TSYNC
  x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist
  x86/speculation: Move firmware_restrict_branch_speculation_*() from C to CPP
  x86/speculation: Use IBRS if available before calling into firmware
  x86/spectre_v2: Don't check microcode versions when running under hypervisors
  x86/speculation: Use Indirect Branch Prediction Barrier in context switch
  x86/mm: Give each mm TLB flush generation a unique ID
  x86/mm: Factor out LDT init from context init
  x86/xen: Zero MSR_IA32_SPEC_CTRL before suspend
  x86/speculation: Add <asm/msr-index.h> dependency
  x86/speculation: Fix up array_index_nospec_mask() asm constraint
  x86/speculation: Clean up various Spectre related details
  x86/speculation: Correct Speculation Control microcode blacklist again
  x86/speculation: Update Speculation Control microcode blacklist
  x86/entry/64/compat: Clear registers for compat syscalls, to reduce speculation attack surface
  x86/asm/entry/32: Simplify pushes of zeroed pt_regs->REGs
  x86/pti: Mark constant arrays as __initconst
  x86/cpuid: Fix up "virtual" IBRS/IBPB/STIBP feature bits on Intel
  x86/cpufeatures: Clean up Spectre v2 related CPUID flags
  x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support
  x86/cpufeature: Blacklist SPEC_CTRL/PRED_CMD on early Spectre v2 microcodes
  x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  x86/msr: Add definitions for new speculation control MSRs
  x86/cpufeatures: Add AMD feature bits for Speculation Control
  x86/cpufeatures: Add Intel feature bits for Speculation Control
  x86/cpufeatures: Add CPUID_7_EDX CPUID leaf
  x86/paravirt: Make native_save_fl() extern inline
  xhci: Fix perceived dead host due to runtime suspend race with event handler
  skbuff: Unconditionally copy pfmemalloc in __skb_clone()
  net: Don't copy pfmemalloc flag in __copy_skb_header()
  tg3: Add higher cpu clock for 5762.
  ptp: fix missing break in switch
  net: phy: fix flag masking in __set_phy_supported
  net/ipv4: Set oif in fib_compute_spec_dst
  lib/rhashtable: consider param->min_size when setting initial table size
  ipv6: fix useless rol32 call on hash
  ipv4: Return EINVAL when ping_group_range sysctl doesn't map to user ns
  mm: memcg: fix use after free in mem_cgroup_iter()
  ARC: mm: allow mprotect to make stack mappings executable
  ARC: Fix CONFIG_SWAP
  ALSA: rawmidi: Change resized buffers atomically
  fat: fix memory allocation failure handling of match_strdup()
  x86/MCE: Remove min interval polling limitation
  KVM/Eventfd: Avoid crash when assign and deassign specific eventfd in parallel.

Conflicts:
	drivers/mtd/ubi/wl.c
	sound/core/rawmidi.c

Change-Id: I277fe9260a764e7923ddc90e7327d9aa5865a038
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 49001fa84ead..1203829316b2 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -119,8 +119,12 @@ irqfd_shutdown(struct work_struct *work)
 {
 	struct kvm_kernel_irqfd *irqfd =
 		container_of(work, struct kvm_kernel_irqfd, shutdown);
+	struct kvm *kvm = irqfd->kvm;
 	u64 cnt;
 
+	/* Make sure irqfd has been initalized in assign path. */
+	synchronize_srcu(&kvm->irq_srcu);
+
 	/*
 	 * Synchronize with the wait-queue and unhook ourselves to prevent
 	 * further events.
@@ -387,7 +391,6 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 
 	idx = srcu_read_lock(&kvm->irq_srcu);
 	irqfd_update(kvm, irqfd);
-	srcu_read_unlock(&kvm->irq_srcu, idx);
 
 	list_add_tail(&irqfd->list, &kvm->irqfds.items);
 
@@ -419,6 +422,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 				irqfd->consumer.token, ret);
 #endif
 
+	srcu_read_unlock(&kvm->irq_srcu, idx);
 	return 0;
 
 fail: