Merge 4.4.97 into android-4.4

Changes in 4.4.97
	ALSA: timer: Add missing mutex lock for compat ioctls
	ALSA: seq: Fix nested rwsem annotation for lockdep splat
	cifs: check MaxPathNameComponentLength != 0 before using it
	KEYS: return full count in keyring_read() if buffer is too small
	KEYS: fix out-of-bounds read during ASN.1 parsing
	ASoC: adau17x1: Workaround for noise bug in ADC
	arm64: ensure __dump_instr() checks addr_limit
	ARM: dts: mvebu: pl310-cache disable double-linefill
	ARM: 8715/1: add a private asm/unaligned.h
	ocfs2: fstrim: Fix start offset of first cluster group during fstrim
	perf tools: Fix build failure on perl script context
	drm/msm: Fix potential buffer overflow issue
	drm/msm: fix an integer overflow test
	tracing/samples: Fix creation and deletion of simple_thread_fn creation
	Fix tracing sample code warning.
	PM / wakeirq: report a wakeup_event on dedicated wekup irq
	mmc: s3cmci: include linux/interrupt.h for tasklet_struct
	ARM: pxa: Don't rely on public mmc header to include leds.h
	mfd: ab8500-sysctrl: Handle probe deferral
	mfd: axp20x: Fix axp288 PEK_DBR and PEK_DBF irqs being swapped
	staging: rtl8712u: Fix endian settings for structs describing network packets
	ext4: fix stripe-unaligned allocations
	ext4: do not use stripe_width if it is not set
	i2c: riic: correctly finish transfers
	drm/amdgpu: when dpm disabled, also need to stop/start vce.
	perf tools: Only increase index if perf_evsel__new_idx() succeeds
	cx231xx: Fix I2C on Internal Master 3 Bus
	xen/manage: correct return value check on xenbus_scanf()
	scsi: aacraid: Process Error for response I/O
	platform/x86: intel_mid_thermal: Fix module autoload
	staging: lustre: llite: don't invoke direct_IO for the EOF case
	staging: lustre: hsm: stack overrun in hai_dump_data_field
	staging: lustre: ptlrpc: skip lock if export failed
	exynos4-is: fimc-is: Unmap region obtained by of_iomap()
	mei: return error on notification request to a disconnected client
	s390/dasd: check for device error pointer within state change interrupts
	bt8xx: fix memory leak
	xen: don't print error message in case of missing Xenstore entry
	staging: r8712u: Fix Sparse warning in rtl871x_xmit.c
	Linux 4.4.97

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

1 files changed, 11 insertions, 3 deletions

diff --git a/samples/trace_events/trace-events-sample.c b/samples/trace_events/trace-events-sample.c
index 880a7d1d27d2..4ccff66523c9 100644
--- a/samples/trace_events/trace-events-sample.c
+++ b/samples/trace_events/trace-events-sample.c
@@ -78,28 +78,36 @@ static int simple_thread_fn(void *arg)
 }
 
 static DEFINE_MUTEX(thread_mutex);
+static int simple_thread_cnt;
 
 void foo_bar_reg(void)
 {
+	mutex_lock(&thread_mutex);
+	if (simple_thread_cnt++)
+		goto out;
+
 	pr_info("Starting thread for foo_bar_fn\n");
 	/*
 	 * We shouldn't be able to start a trace when the module is
 	 * unloading (there's other locks to prevent that). But
 	 * for consistency sake, we still take the thread_mutex.
 	 */
-	mutex_lock(&thread_mutex);
 	simple_tsk_fn = kthread_run(simple_thread_fn, NULL, "event-sample-fn");
+ out:
 	mutex_unlock(&thread_mutex);
 }
 
 void foo_bar_unreg(void)
 {
-	pr_info("Killing thread for foo_bar_fn\n");
-	/* protect against module unloading */
 	mutex_lock(&thread_mutex);
+	if (--simple_thread_cnt)
+		goto out;
+
+	pr_info("Killing thread for foo_bar_fn\n");
 	if (simple_tsk_fn)
 		kthread_stop(simple_tsk_fn);
 	simple_tsk_fn = NULL;
+ out:
 	mutex_unlock(&thread_mutex);
 }