Merge 4.4.116 into android-4.4

Changes in 4.4.116
	powerpc/bpf/jit: Disable classic BPF JIT on ppc64le
	powerpc/64: Fix flush_(d|i)cache_range() called from modules
	powerpc: Fix VSX enabling/flushing to also test MSR_FP and MSR_VEC
	powerpc: Simplify module TOC handling
	powerpc/pseries: Add H_GET_CPU_CHARACTERISTICS flags & wrapper
	powerpc/64: Add macros for annotating the destination of rfid/hrfid
	powerpc/64s: Simple RFI macro conversions
	powerpc/64: Convert fast_exception_return to use RFI_TO_USER/KERNEL
	powerpc/64: Convert the syscall exit path to use RFI_TO_USER/KERNEL
	powerpc/64s: Convert slb_miss_common to use RFI_TO_USER/KERNEL
	powerpc/64s: Add support for RFI flush of L1-D cache
	powerpc/64s: Support disabling RFI flush with no_rfi_flush and nopti
	powerpc/pseries: Query hypervisor for RFI flush settings
	powerpc/powernv: Check device-tree for RFI flush settings
	powerpc/64s: Wire up cpu_show_meltdown()
	powerpc/64s: Allow control of RFI flush via debugfs
	ASoC: pcm512x: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE
	usbip: vhci_hcd: clear just the USB_PORT_STAT_POWER bit
	usbip: fix 3eee23c3ec14 tcp_socket address still in the status file
	net: cdc_ncm: initialize drvflags before usage
	ASoC: simple-card: Fix misleading error message
	ASoC: rsnd: don't call free_irq() on Parent SSI
	ASoC: rsnd: avoid duplicate free_irq()
	drm: rcar-du: Use the VBK interrupt for vblank events
	drm: rcar-du: Fix race condition when disabling planes at CRTC stop
	x86/asm: Fix inline asm call constraints for GCC 4.4
	ip6mr: fix stale iterator
	net: igmp: add a missing rcu locking section
	qlcnic: fix deadlock bug
	r8169: fix RTL8168EP take too long to complete driver initialization.
	tcp: release sk_frag.page in tcp_disconnect
	vhost_net: stop device during reset owner
	media: soc_camera: soc_scale_crop: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE
	KEYS: encrypted: fix buffer overread in valid_master_desc()
	don't put symlink bodies in pagecache into highmem
	crypto: tcrypt - fix S/G table for test_aead_speed()
	x86/microcode/AMD: Do not load when running on a hypervisor
	x86/microcode: Do the family check first
	powerpc/pseries: include linux/types.h in asm/hvcall.h
	cifs: Fix missing put_xid in cifs_file_strict_mmap
	cifs: Fix autonegotiate security settings mismatch
	CIFS: zero sensitive data when freeing
	dmaengine: dmatest: fix container_of member in dmatest_callback
	x86/kaiser: fix build error with KASAN && !FUNCTION_GRAPH_TRACER
	kaiser: fix compile error without vsyscall
	netfilter: nf_queue: Make the queue_handler pernet
	posix-timer: Properly check sigevent->sigev_notify
	usb: gadget: uvc: Missing files for configfs interface
	sched/rt: Use container_of() to get root domain in rto_push_irq_work_func()
	sched/rt: Up the root domain ref count when passing it around via IPIs
	dccp: CVE-2017-8824: use-after-free in DCCP code
	media: dvb-usb-v2: lmedm04: Improve logic checking of warm start
	media: dvb-usb-v2: lmedm04: move ts2020 attach to dm04_lme2510_tuner
	mtd: cfi: convert inline functions to macros
	mtd: nand: brcmnand: Disable prefetch by default
	mtd: nand: Fix nand_do_read_oob() return value
	mtd: nand: sunxi: Fix ECC strength choice
	ubi: block: Fix locking for idr_alloc/idr_remove
	nfs/pnfs: fix nfs_direct_req ref leak when i/o falls back to the mds
	NFS: Add a cond_resched() to nfs_commit_release_pages()
	NFS: commit direct writes even if they fail partially
	NFS: reject request for id_legacy key without auxdata
	kernfs: fix regression in kernfs_fop_write caused by wrong type
	ahci: Annotate PCI ids for mobile Intel chipsets as such
	ahci: Add PCI ids for Intel Bay Trail, Cherry Trail and Apollo Lake AHCI
	ahci: Add Intel Cannon Lake PCH-H PCI ID
	crypto: hash - introduce crypto_hash_alg_has_setkey()
	crypto: cryptd - pass through absence of ->setkey()
	crypto: poly1305 - remove ->setkey() method
	nsfs: mark dentry with DCACHE_RCUACCESS
	media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
	vb2: V4L2_BUF_FLAG_DONE is set after DQBUF
	media: v4l2-compat-ioctl32.c: add missing VIDIOC_PREPARE_BUF
	media: v4l2-compat-ioctl32.c: fix the indentation
	media: v4l2-compat-ioctl32.c: move 'helper' functions to __get/put_v4l2_format32
	media: v4l2-compat-ioctl32.c: avoid sizeof(type)
	media: v4l2-compat-ioctl32.c: copy m.userptr in put_v4l2_plane32
	media: v4l2-compat-ioctl32.c: fix ctrl_is_pointer
	media: v4l2-compat-ioctl32.c: make ctrl_is_pointer work for subdevs
	media: v4l2-compat-ioctl32: Copy v4l2_window->global_alpha
	media: v4l2-compat-ioctl32.c: copy clip list in put_v4l2_window32
	media: v4l2-compat-ioctl32.c: drop pr_info for unknown buffer type
	media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors
	media: v4l2-compat-ioctl32.c: refactor compat ioctl32 logic
	crypto: caam - fix endless loop when DECO acquire fails
	arm: KVM: Fix SMCCC handling of unimplemented SMC/HVC calls
	KVM: nVMX: Fix races when sending nested PI while dest enters/leaves L2
	watchdog: imx2_wdt: restore previous timeout after suspend+resume
	media: ts2020: avoid integer overflows on 32 bit machines
	media: cxusb, dib0700: ignore XC2028_I2C_FLUSH
	kernel/async.c: revert "async: simplify lowest_in_progress()"
	HID: quirks: Fix keyboard + touchpad on Toshiba Click Mini not working
	Bluetooth: btsdio: Do not bind to non-removable BCM43341
	Revert "Bluetooth: btusb: fix QCA Rome suspend/resume"
	Bluetooth: btusb: Restore QCA Rome suspend/resume fix with a "rewritten" version
	signal/openrisc: Fix do_unaligned_access to send the proper signal
	signal/sh: Ensure si_signo is initialized in do_divide_error
	alpha: fix crash if pthread_create races with signal delivery
	alpha: fix reboot on Avanti platform
	xtensa: fix futex_atomic_cmpxchg_inatomic
	EDAC, octeon: Fix an uninitialized variable warning
	pktcdvd: Fix pkt_setup_dev() error path
	btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker
	nvme: Fix managing degraded controllers
	ACPI: sbshc: remove raw pointer from printk() message
	ovl: fix failure to fsync lower dir
	mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy
	ftrace: Remove incorrect setting of glob search field
	Linux 4.4.116

Change-Id: Id000cb8d59b74de063902e9ad24dd07fe1b1694b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

3 files changed, 30 insertions, 9 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6c9213a6fa9f..a767432922ca 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6095,6 +6095,19 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
 		call_rcu_sched(&old_rd->rcu, free_rootdomain);
 }
 
+void sched_get_rd(struct root_domain *rd)
+{
+	atomic_inc(&rd->refcount);
+}
+
+void sched_put_rd(struct root_domain *rd)
+{
+	if (!atomic_dec_and_test(&rd->refcount))
+		return;
+
+	call_rcu_sched(&rd->rcu, free_rootdomain);
+}
+
 static int init_rootdomain(struct root_domain *rd)
 {
 	memset(rd, 0, sizeof(*rd));
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index d367aa11e511..382d1d5cfbb7 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2039,9 +2039,8 @@ static void push_rt_tasks(struct rq *rq)
  * the rt_loop_next will cause the iterator to perform another scan.
  *
  */
-static int rto_next_cpu(struct rq *rq)
+static int rto_next_cpu(struct root_domain *rd)
 {
-	struct root_domain *rd = rq->rd;
 	int next;
 	int cpu;
 
@@ -2117,19 +2116,24 @@ static void tell_cpu_to_push(struct rq *rq)
 	 * Otherwise it is finishing up and an ipi needs to be sent.
 	 */
 	if (rq->rd->rto_cpu < 0)
-		cpu = rto_next_cpu(rq);
+		cpu = rto_next_cpu(rq->rd);
 
 	raw_spin_unlock(&rq->rd->rto_lock);
 
 	rto_start_unlock(&rq->rd->rto_loop_start);
 
-	if (cpu >= 0)
+	if (cpu >= 0) {
+		/* Make sure the rd does not get freed while pushing */
+		sched_get_rd(rq->rd);
 		irq_work_queue_on(&rq->rd->rto_push_work, cpu);
+	}
 }
 
 /* Called from hardirq context */
 void rto_push_irq_work_func(struct irq_work *work)
 {
+	struct root_domain *rd =
+		container_of(work, struct root_domain, rto_push_work);
 	struct rq *rq;
 	int cpu;
 
@@ -2145,18 +2149,20 @@ void rto_push_irq_work_func(struct irq_work *work)
 		raw_spin_unlock(&rq->lock);
 	}
 
-	raw_spin_lock(&rq->rd->rto_lock);
+	raw_spin_lock(&rd->rto_lock);
 
 	/* Pass the IPI to the next rt overloaded queue */
-	cpu = rto_next_cpu(rq);
+	cpu = rto_next_cpu(rd);
 
-	raw_spin_unlock(&rq->rd->rto_lock);
+	raw_spin_unlock(&rd->rto_lock);
 
-	if (cpu < 0)
+	if (cpu < 0) {
+		sched_put_rd(rd);
 		return;
+	}
 
 	/* Try the next RT overloaded CPU */
-	irq_work_queue_on(&rq->rd->rto_push_work, cpu);
+	irq_work_queue_on(&rd->rto_push_work, cpu);
 }
 #endif /* HAVE_RT_PUSH_IPI */
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index b9ba3279f095..d9ad549591d8 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -585,6 +585,8 @@ struct root_domain {
 };
 
 extern struct root_domain def_root_domain;
+extern void sched_get_rd(struct root_domain *rd);
+extern void sched_put_rd(struct root_domain *rd);
 
 #ifdef HAVE_RT_PUSH_IPI
 extern void rto_push_irq_work_func(struct irq_work *work);