Merge 4.4.166 into android-4.4-p

Changes in 4.4.166
	usb: core: Fix hub port connection events lost
	usb: xhci: fix timeout for transition from RExit to U0
	MAINTAINERS: Add Sasha as a stable branch maintainer
	iwlwifi: mvm: support sta_statistics() even on older firmware
	v9fs_dir_readdir: fix double-free on p9stat_read error
	bfs: add sanity check at bfs_fill_super()
	sctp: clear the transport of some out_chunk_list chunks in sctp_assoc_rm_peer
	gfs2: Don't leave s_fs_info pointing to freed memory in init_sbd
	llc: do not use sk_eat_skb()
	drm/ast: change resolution may cause screen blurred
	drm/ast: fixed cursor may disappear sometimes
	can: dev: can_get_echo_skb(): factor out non sending code to __can_get_echo_skb()
	can: dev: __can_get_echo_skb(): replace struct can_frame by canfd_frame to access frame length
	can: dev: __can_get_echo_skb(): Don't crash the kernel if can_priv::echo_skb is accessed out of bounds
	can: dev: __can_get_echo_skb(): print error message, if trying to echo non existing skb
	usb: xhci: Prevent bus suspend if a port connect change or polling state is detected
	KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE
	cpufreq: imx6q: add return value check for voltage scale
	SUNRPC: Fix a bogus get/put in generic_key_to_expire()
	kdb: Use strscpy with destination buffer size
	powerpc/numa: Suppress "VPHN is not supported" messages
	tmpfs: make lseek(SEEK_DATA/SEK_HOLE) return ENXIO with a negative offset
	of: add helper to lookup compatible child node
	NFC: nfcmrvl_uart: fix OF child-node lookup
	net: bcmgenet: fix OF child-node lookup
	x86/entry: spell EBX register correctly in documentation
	x86/entry/64: Remove %ebx handling from error_entry/exit
	arm64: remove no-op -p linker flag
	ath10k: fix kernel panic due to race in accessing arvif list
	Input: xpad - remove spurious events of wireless xpad 360 controller
	Input: xpad - handle "present" and "gone" correctly
	Input: xpad - update Xbox One Force Feedback Support
	Input: xpad - workaround dead irq_out after suspend/ resume
	Input: xpad - use LED API when identifying wireless controllers
	Input: xpad - correct xbox one pad device name
	Input: xpad - remove unused function
	Input: xpad - add Mad Catz FightStick TE 2 VID/PID
	Input: xpad - prevent spurious input from wired Xbox 360 controllers
	Input: xpad - add more third-party controllers
	Input: xpad - xbox one elite controller support
	Input: xpad - fix rumble on Xbox One controllers with 2015 firmware
	Input: xpad - power off wireless 360 controllers on suspend
	Input: xpad - add product ID for Xbox One S pad
	Input: xpad - fix Xbox One rumble stopping after 2.5 secs
	Input: xpad - correctly sort vendor id's
	Input: xpad - move reporting xbox one home button to common function
	Input: xpad - simplify error condition in init_output
	Input: xpad - don't depend on endpoint order
	Input: xpad - fix stuck mode button on Xbox One S pad
	Input: xpad - restore LED state after device resume
	Input: xpad - support some quirky Xbox One pads
	Input: xpad - sort supported devices by USB ID
	Input: xpad - sync supported devices with xboxdrv
	Input: xpad - add USB IDs for Mad Catz Brawlstick and Razer Sabertooth
	Input: xpad - sync supported devices with 360Controller
	Input: xpad - sync supported devices with XBCD
	Input: xpad - constify usb_device_id
	Input: xpad - fix PowerA init quirk for some gamepad models
	Input: xpad - validate USB endpoint type during probe
	Input: xpad - add support for PDP Xbox One controllers
	Input: xpad - add PDP device id 0x02a4
	Input: xpad - fix some coding style issues
	Input: xpad - avoid using __set_bit() for capabilities
	Input: xpad - add GPD Win 2 Controller USB IDs
	Input: xpad - fix GPD Win 2 controller name
	Input: xpad - add support for Xbox1 PDP Camo series gamepad
	cw1200: Don't leak memory if krealloc failes
	mwifiex: Fix NULL pointer dereference in skb_dequeue()
	mwifiex: fix p2p device doesn't find in scan problem
	netfilter: nf_tables: fix oops when inserting an element into a verdict map
	scsi: ufs: fix bugs related to null pointer access and array size
	scsi: ufshcd: Fix race between clk scaling and ungate work
	scsi: ufs: fix race between clock gating and devfreq scaling work
	scsi: ufshcd: release resources if probe fails
	scsi: qla2xxx: do not queue commands when unloading
	iwlwifi: mvm: fix regulatory domain update when the firmware starts
	tty: wipe buffer.
	tty: wipe buffer if not echoing data
	usb: xhci: fix uninitialized completion when USB3 port got wrong status
	btrfs: Ensure btrfs_trim_fs can trim the whole filesystem
	sched/core: Allow __sched_setscheduler() in interrupts when PI is not used
	namei: allow restricted O_CREAT of FIFOs and regular files
	s390/mm: Check for valid vma before zapping in gmap_discard
	drm/ast: Remove existing framebuffers before loading driver
	Linux 4.4.166

Change-Id: I27e4a45948cb7b5f9b6c44756dab9f56add70a43
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

5 files changed, 35 insertions, 14 deletions

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 3990c1f73e45..d3c5b15c86c1 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -215,7 +215,7 @@ static char *kdb_read(char *buffer, size_t bufsize)
 	int count;
 	int i;
 	int diag, dtab_count;
-	int key;
+	int key, buf_size, ret;
 	static int last_crlf;
 
 	diag = kdbgetintenv("DTABCOUNT", &dtab_count);
@@ -343,9 +343,8 @@ poll_again:
 		else
 			p_tmp = tmpbuffer;
 		len = strlen(p_tmp);
-		count = kallsyms_symbol_complete(p_tmp,
-						 sizeof(tmpbuffer) -
-						 (p_tmp - tmpbuffer));
+		buf_size = sizeof(tmpbuffer) - (p_tmp - tmpbuffer);
+		count = kallsyms_symbol_complete(p_tmp, buf_size);
 		if (tab == 2 && count > 0) {
 			kdb_printf("\n%d symbols are found.", count);
 			if (count > dtab_count) {
@@ -357,9 +356,13 @@ poll_again:
 			}
 			kdb_printf("\n");
 			for (i = 0; i < count; i++) {
-				if (WARN_ON(!kallsyms_symbol_next(p_tmp, i)))
+				ret = kallsyms_symbol_next(p_tmp, i, buf_size);
+				if (WARN_ON(!ret))
 					break;
-				kdb_printf("%s ", p_tmp);
+				if (ret != -E2BIG)
+					kdb_printf("%s ", p_tmp);
+				else
+					kdb_printf("%s... ", p_tmp);
 				*(p_tmp + len) = '\0';
 			}
 			if (i >= dtab_count)
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index 75014d7f4568..533e04e75a9c 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -83,7 +83,7 @@ typedef struct __ksymtab {
 		unsigned long sym_start;
 		unsigned long sym_end;
 		} kdb_symtab_t;
-extern int kallsyms_symbol_next(char *prefix_name, int flag);
+extern int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size);
 extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
 
 /* Exported Symbols for kernel loadable modules to use. */
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index d35cc2d3a4cc..2aed4a33521b 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -221,11 +221,13 @@ int kallsyms_symbol_complete(char *prefix_name, int max_len)
  * Parameters:
  *	prefix_name	prefix of a symbol name to lookup
  *	flag	0 means search from the head, 1 means continue search.
+ *	buf_size	maximum length that can be written to prefix_name
+ *			buffer
  * Returns:
  *	1 if a symbol matches the given prefix.
  *	0 if no string found
  */
-int kallsyms_symbol_next(char *prefix_name, int flag)
+int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size)
 {
 	int prefix_len = strlen(prefix_name);
 	static loff_t pos;
@@ -235,10 +237,8 @@ int kallsyms_symbol_next(char *prefix_name, int flag)
 		pos = 0;
 
 	while ((name = kdb_walk_kallsyms(&pos))) {
-		if (strncmp(name, prefix_name, prefix_len) == 0) {
-			strncpy(prefix_name, name, strlen(name)+1);
-			return 1;
-		}
+		if (!strncmp(name, prefix_name, prefix_len))
+			return strscpy(prefix_name, name, buf_size);
 	}
 	return 0;
 }
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d6a90c8bfedc..328e17dc2f9b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3944,8 +3944,8 @@ static int __sched_setscheduler(struct task_struct *p,
 	struct rq *rq;
 	int reset_on_fork;
 
-	/* may grab non-irq protected spin_locks */
-	BUG_ON(in_interrupt());
+	/* The pi code expects interrupts enabled */
+	BUG_ON(pi && in_interrupt());
 recheck:
 	/* double check policy once rq lock held */
 	if (policy < 0) {
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 1464cab7cabe..bf19e8cbcb51 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1806,6 +1806,24 @@ static struct ctl_table fs_table[] = {
 		.extra2		= &one,
 	},
 	{
+		.procname	= "protected_fifos",
+		.data		= &sysctl_protected_fifos,
+		.maxlen		= sizeof(int),
+		.mode		= 0600,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &two,
+	},
+	{
+		.procname	= "protected_regular",
+		.data		= &sysctl_protected_regular,
+		.maxlen		= sizeof(int),
+		.mode		= 0600,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &two,
+	},
+	{
 		.procname	= "suid_dumpable",
 		.data		= &suid_dumpable,
 		.maxlen		= sizeof(int),