Merge 4.4.105 into android-4.4

Changes in 4.4.105
	bcache: only permit to recovery read error when cache device is clean
	bcache: recover data from backing when data is clean
	uas: Always apply US_FL_NO_ATA_1X quirk to Seagate devices
	usb: quirks: Add no-lpm quirk for KY-688 USB 3.1 Type-C Hub
	serial: 8250_pci: Add Amazon PCI serial device ID
	s390/runtime instrumentation: simplify task exit handling
	USB: serial: option: add Quectel BG96 id
	ima: fix hash algorithm initialization
	s390/pci: do not require AIS facility
	selftests/x86/ldt_get: Add a few additional tests for limits
	serial: 8250_fintek: Fix rs485 disablement on invalid ioctl()
	spi: sh-msiof: Fix DMA transfer size check
	usb: phy: tahvo: fix error handling in tahvo_usb_probe()
	serial: 8250: Preserve DLD[7:4] for PORT_XR17V35X
	x86/entry: Use SYSCALL_DEFINE() macros for sys_modify_ldt()
	EDAC, sb_edac: Fix missing break in switch
	sysrq : fix Show Regs call trace on ARM
	perf test attr: Fix ignored test case result
	kprobes/x86: Disable preemption in ftrace-based jprobes
	net: systemport: Utilize skb_put_padto()
	net: systemport: Pad packet before inserting TSB
	ARM: OMAP1: DMA: Correct the number of logical channels
	vti6: fix device register to report IFLA_INFO_KIND
	net/appletalk: Fix kernel memory disclosure
	ravb: Remove Rx overflow log messages
	nfs: Don't take a reference on fl->fl_file for LOCK operation
	KVM: arm/arm64: Fix occasional warning from the timer work function
	NFSv4: Fix client recovery when server reboots multiple times
	drm/exynos/decon5433: set STANDALONE_UPDATE_F on output enablement
	net: sctp: fix array overrun read on sctp_timer_tbl
	tipc: fix cleanup at module unload
	dmaengine: pl330: fix double lock
	tcp: correct memory barrier usage in tcp_check_space()
	mm: avoid returning VM_FAULT_RETRY from ->page_mkwrite handlers
	xen-netfront: Improve error handling during initialization
	net: fec: fix multicast filtering hardware setup
	Revert "ocfs2: should wait dio before inode lock in ocfs2_setattr()"
	usb: hub: Cycle HUB power when initialization fails
	usb: xhci: fix panic in xhci_free_virt_devices_depth_first
	usb: Add USB 3.1 Precision time measurement capability descriptor support
	usb: ch9: Add size macro for SSP dev cap descriptor
	USB: core: Add type-specific length check of BOS descriptors
	USB: Increase usbfs transfer limit
	USB: devio: Prevent integer overflow in proc_do_submiturb()
	USB: usbfs: Filter flags passed in from user space
	usb: host: fix incorrect updating of offset
	xen-netfront: avoid crashing on resume after a failure in talk_to_netback()
	Linux 4.4.105

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

11 files changed, 68 insertions, 45 deletions

diff --git a/arch/arm/mach-omap1/dma.c b/arch/arm/mach-omap1/dma.c
index 7b02ed218a42..0c120b2ea2f9 100644
--- a/arch/arm/mach-omap1/dma.c
+++ b/arch/arm/mach-omap1/dma.c
@@ -31,7 +31,6 @@
 #include "soc.h"
 
 #define OMAP1_DMA_BASE			(0xfffed800)
-#define OMAP1_LOGICAL_DMA_CH_COUNT	17
 
 static u32 enable_1510_mode;
 
@@ -311,8 +310,6 @@ static int __init omap1_system_dma_init(void)
 		goto exit_iounmap;
 	}
 
-	d->lch_count		= OMAP1_LOGICAL_DMA_CH_COUNT;
-
 	/* Valid attributes for omap1 plus processors */
 	if (cpu_is_omap15xx())
 		d->dev_caps = ENABLE_1510_MODE;
@@ -329,13 +326,14 @@ static int __init omap1_system_dma_init(void)
 	d->dev_caps		|= CLEAR_CSR_ON_READ;
 	d->dev_caps		|= IS_WORD_16;
 
-	if (cpu_is_omap15xx())
-		d->chan_count = 9;
-	else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
-		if (!(d->dev_caps & ENABLE_1510_MODE))
-			d->chan_count = 16;
+	/* available logical channels */
+	if (cpu_is_omap15xx()) {
+		d->lch_count = 9;
+	} else {
+		if (d->dev_caps & ENABLE_1510_MODE)
+			d->lch_count = 9;
 		else
-			d->chan_count = 9;
+			d->lch_count = 16;
 	}
 
 	p = dma_plat_info;
diff --git a/arch/s390/include/asm/pci_insn.h b/arch/s390/include/asm/pci_insn.h
index 649eb62c52b3..9e02cb7955c1 100644
--- a/arch/s390/include/asm/pci_insn.h
+++ b/arch/s390/include/asm/pci_insn.h
@@ -81,6 +81,6 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range);
 int zpci_load(u64 *data, u64 req, u64 offset);
 int zpci_store(u64 data, u64 req, u64 offset);
 int zpci_store_block(const u64 *data, u64 req, u64 offset);
-void zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc);
+int zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc);
 
 #endif
diff --git a/arch/s390/include/asm/runtime_instr.h b/arch/s390/include/asm/runtime_instr.h
index 402ad6df4897..c54a9310d814 100644
--- a/arch/s390/include/asm/runtime_instr.h
+++ b/arch/s390/include/asm/runtime_instr.h
@@ -85,6 +85,8 @@ static inline void restore_ri_cb(struct runtime_instr_cb *cb_next,
 		load_runtime_instr_cb(&runtime_instr_empty_cb);
 }
 
-void exit_thread_runtime_instr(void);
+struct task_struct;
+
+void runtime_instr_release(struct task_struct *tsk);
 
 #endif /* _RUNTIME_INSTR_H */
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index efa035a31b98..7bc4e4c5d5b8 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -72,7 +72,6 @@ extern void kernel_thread_starter(void);
  */
 void exit_thread(void)
 {
-	exit_thread_runtime_instr();
 }
 
 void flush_thread(void)
@@ -87,6 +86,7 @@ void arch_release_task_struct(struct task_struct *tsk)
 {
 	/* Free either the floating-point or the vector register save area */
 	kfree(tsk->thread.fpu.regs);
+	runtime_instr_release(tsk);
 }
 
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
diff --git a/arch/s390/kernel/runtime_instr.c b/arch/s390/kernel/runtime_instr.c
index 70cdb03d4acd..fd03a7569e10 100644
--- a/arch/s390/kernel/runtime_instr.c
+++ b/arch/s390/kernel/runtime_instr.c
@@ -18,11 +18,24 @@
 /* empty control block to disable RI by loading it */
 struct runtime_instr_cb runtime_instr_empty_cb;
 
+void runtime_instr_release(struct task_struct *tsk)
+{
+	kfree(tsk->thread.ri_cb);
+}
+
 static void disable_runtime_instr(void)
 {
-	struct pt_regs *regs = task_pt_regs(current);
+	struct task_struct *task = current;
+	struct pt_regs *regs;
 
+	if (!task->thread.ri_cb)
+		return;
+	regs = task_pt_regs(task);
+	preempt_disable();
 	load_runtime_instr_cb(&runtime_instr_empty_cb);
+	kfree(task->thread.ri_cb);
+	task->thread.ri_cb = NULL;
+	preempt_enable();
 
 	/*
 	 * Make sure the RI bit is deleted from the PSW. If the user did not
@@ -43,19 +56,6 @@ static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
 	cb->valid = 1;
 }
 
-void exit_thread_runtime_instr(void)
-{
-	struct task_struct *task = current;
-
-	preempt_disable();
-	if (!task->thread.ri_cb)
-		return;
-	disable_runtime_instr();
-	kfree(task->thread.ri_cb);
-	task->thread.ri_cb = NULL;
-	preempt_enable();
-}
-
 SYSCALL_DEFINE1(s390_runtime_instr, int, command)
 {
 	struct runtime_instr_cb *cb;
@@ -64,7 +64,7 @@ SYSCALL_DEFINE1(s390_runtime_instr, int, command)
 		return -EOPNOTSUPP;
 
 	if (command == S390_RUNTIME_INSTR_STOP) {
-		exit_thread_runtime_instr();
+		disable_runtime_instr();
 		return 0;
 	}
 
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index f2f6720a3331..ef0499b76c50 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -359,7 +359,8 @@ static void zpci_irq_handler(struct airq_struct *airq)
 				/* End of second scan with interrupts on. */
 				break;
 			/* First scan complete, reenable interrupts. */
-			zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
+			if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC))
+				break;
 			si = 0;
 			continue;
 		}
@@ -921,7 +922,7 @@ static int __init pci_base_init(void)
 	if (!s390_pci_probe)
 		return 0;
 
-	if (!test_facility(69) || !test_facility(71) || !test_facility(72))
+	if (!test_facility(69) || !test_facility(71))
 		return 0;
 
 	rc = zpci_debug_init();
diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
index 10ca15dcab11..bc065392f7ab 100644
--- a/arch/s390/pci/pci_insn.c
+++ b/arch/s390/pci/pci_insn.c
@@ -7,6 +7,7 @@
 #include <linux/export.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
+#include <asm/facility.h>
 #include <asm/pci_insn.h>
 #include <asm/pci_debug.h>
 #include <asm/processor.h>
@@ -91,11 +92,14 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
 }
 
 /* Set Interruption Controls */
-void zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc)
+int zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc)
 {
+	if (!test_facility(72))
+		return -EIO;
 	asm volatile (
 		"	.insn	rsy,0xeb00000000d1,%[ctl],%[isc],%[u]\n"
 		: : [ctl] "d" (ctl), [isc] "d" (isc << 27), [u] "Q" (*unused));
+	return 0;
 }
 
 /* PCI Load */
diff --git a/arch/x86/include/asm/syscalls.h b/arch/x86/include/asm/syscalls.h
index 91dfcafe27a6..bad25bb80679 100644
--- a/arch/x86/include/asm/syscalls.h
+++ b/arch/x86/include/asm/syscalls.h
@@ -21,7 +21,7 @@ asmlinkage long sys_ioperm(unsigned long, unsigned long, int);
 asmlinkage long sys_iopl(unsigned int);
 
 /* kernel/ldt.c */
-asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);
+asmlinkage long sys_modify_ldt(int, void __user *, unsigned long);
 
 /* kernel/signal.c */
 asmlinkage long sys_rt_sigreturn(void);
diff --git a/arch/x86/kernel/kprobes/ftrace.c b/arch/x86/kernel/kprobes/ftrace.c
index 5f8f0b3cc674..2c0b0b645a74 100644
--- a/arch/x86/kernel/kprobes/ftrace.c
+++ b/arch/x86/kernel/kprobes/ftrace.c
@@ -26,7 +26,7 @@
 #include "common.h"
 
 static nokprobe_inline
-int __skip_singlestep(struct kprobe *p, struct pt_regs *regs,
+void __skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 		      struct kprobe_ctlblk *kcb, unsigned long orig_ip)
 {
 	/*
@@ -41,20 +41,21 @@ int __skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 	__this_cpu_write(current_kprobe, NULL);
 	if (orig_ip)
 		regs->ip = orig_ip;
-	return 1;
 }
 
 int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 		    struct kprobe_ctlblk *kcb)
 {
-	if (kprobe_ftrace(p))
-		return __skip_singlestep(p, regs, kcb, 0);
-	else
-		return 0;
+	if (kprobe_ftrace(p)) {
+		__skip_singlestep(p, regs, kcb, 0);
+		preempt_enable_no_resched();
+		return 1;
+	}
+	return 0;
 }
 NOKPROBE_SYMBOL(skip_singlestep);
 
-/* Ftrace callback handler for kprobes */
+/* Ftrace callback handler for kprobes -- called under preepmt disabed */
 void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 			   struct ftrace_ops *ops, struct pt_regs *regs)
 {
@@ -77,13 +78,17 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		/* Kprobe handler expects regs->ip = ip + 1 as breakpoint hit */
 		regs->ip = ip + sizeof(kprobe_opcode_t);
 
+		/* To emulate trap based kprobes, preempt_disable here */
+		preempt_disable();
 		__this_cpu_write(current_kprobe, p);
 		kcb->kprobe_status = KPROBE_HIT_ACTIVE;
-		if (!p->pre_handler || !p->pre_handler(p, regs))
+		if (!p->pre_handler || !p->pre_handler(p, regs)) {
 			__skip_singlestep(p, regs, kcb, orig_ip);
+			preempt_enable_no_resched();
+		}
 		/*
 		 * If pre_handler returns !0, it sets regs->ip and
-		 * resets current kprobe.
+		 * resets current kprobe, and keep preempt count +1.
 		 */
 	}
 end:
diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index 6acc9dd91f36..d6279593bcdd 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -12,6 +12,7 @@
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
+#include <linux/syscalls.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/uaccess.h>
@@ -271,8 +272,8 @@ out:
 	return error;
 }
 
-asmlinkage int sys_modify_ldt(int func, void __user *ptr,
-			      unsigned long bytecount)
+SYSCALL_DEFINE3(modify_ldt, int , func , void __user * , ptr ,
+		unsigned long , bytecount)
 {
 	int ret = -ENOSYS;
 
@@ -290,5 +291,14 @@ asmlinkage int sys_modify_ldt(int func, void __user *ptr,
 		ret = write_ldt(ptr, bytecount, 0);
 		break;
 	}
-	return ret;
+	/*
+	 * The SYSCALL_DEFINE() macros give us an 'unsigned long'
+	 * return type, but tht ABI for sys_modify_ldt() expects
+	 * 'int'.  This cast gives us an int-sized value in %rax
+	 * for the return code.  The 'unsigned' is necessary so
+	 * the compiler does not try to sign-extend the negative
+	 * return codes into the high half of the register when
+	 * taking the value from int->long.
+	 */
+	return (unsigned int)ret;
 }
diff --git a/arch/x86/um/ldt.c b/arch/x86/um/ldt.c
index 836a1eb5df43..3ee234b6234d 100644
--- a/arch/x86/um/ldt.c
+++ b/arch/x86/um/ldt.c
@@ -6,6 +6,7 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/syscalls.h>
 #include <linux/uaccess.h>
 #include <asm/unistd.h>
 #include <os.h>
@@ -369,7 +370,9 @@ void free_ldt(struct mm_context *mm)
 	mm->arch.ldt.entry_count = 0;
 }
 
-int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
+SYSCALL_DEFINE3(modify_ldt, int , func , void __user * , ptr ,
+		unsigned long , bytecount)
 {
-	return do_modify_ldt_skas(func, ptr, bytecount);
+	/* See non-um modify_ldt() for why we do this cast */
+	return (unsigned int)do_modify_ldt_skas(func, ptr, bytecount);
 }