Merge branch 'linux-4.1.y' of git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into linux-linaro-lsk-v4.1lsk-v4.1-15.07

* 'linux-4.1.y' of git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable: (126 commits)
  Linux 4.1.3
  Input: pixcir_i2c_ts - fix receive error
  of/pci: Fix pci_address_to_pio() conversion of CPU address to I/O port
  PCI: pciehp: Wait for hotplug command completion where necessary
  PCI: Add pci_bus_addr_t
  PCI: Propagate the "ignore hotplug" setting to parent
  mtd: dc21285: use raw spinlock functions for nw_gpio_lock
  mtd: fix: avoid race condition when accessing mtd->usecount
  leds / PM: fix hibernation on arm when gpio-led used with CPU led trigger
  video: mxsfb: Make sure axi clock is enabled when accessing registers
  genirq: devres: Fix testing return value of request_any_context_irq()
  IB/srp: Fix reconnection failure handling
  IB/srp: Fix connection state tracking
  IB/srp: Fix a connection setup race
  IB/srp: Remove an extraneous scsi_host_put() from an error path
  scsi_transport_srp: Fix a race condition
  scsi_transport_srp: Introduce srp_wait_for_queuecommand()
  spi: pl022: Specify 'num-cs' property as required in devicetree binding
  spi: orion: Fix maximum baud rates for Armada 370/XP
  spi: fix race freeing dummy_tx/rx before it is unmapped
  ...

1 files changed, 21 insertions, 7 deletions

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f0fe4f2c1fa7..3716cdb8ba42 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -195,6 +195,8 @@ static struct kmem_cache *scan_area_cache;
 
 /* set if tracing memory operations is enabled */
 static int kmemleak_enabled;
+/* same as above but only for the kmemleak_free() callback */
+static int kmemleak_free_enabled;
 /* set in the late_initcall if there were no errors */
 static int kmemleak_initialized;
 /* enables or disables early logging of the memory operations */
@@ -907,12 +909,13 @@ EXPORT_SYMBOL_GPL(kmemleak_alloc);
  * kmemleak_alloc_percpu - register a newly allocated __percpu object
  * @ptr:	__percpu pointer to beginning of the object
  * @size:	size of the object
+ * @gfp:	flags used for kmemleak internal memory allocations
  *
  * This function is called from the kernel percpu allocator when a new object
- * (memory block) is allocated (alloc_percpu). It assumes GFP_KERNEL
- * allocation.
+ * (memory block) is allocated (alloc_percpu).
  */
-void __ref kmemleak_alloc_percpu(const void __percpu *ptr, size_t size)
+void __ref kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
+				 gfp_t gfp)
 {
 	unsigned int cpu;
 
@@ -925,7 +928,7 @@ void __ref kmemleak_alloc_percpu(const void __percpu *ptr, size_t size)
 	if (kmemleak_enabled && ptr && !IS_ERR(ptr))
 		for_each_possible_cpu(cpu)
 			create_object((unsigned long)per_cpu_ptr(ptr, cpu),
-				      size, 0, GFP_KERNEL);
+				      size, 0, gfp);
 	else if (kmemleak_early_log)
 		log_early(KMEMLEAK_ALLOC_PERCPU, ptr, size, 0);
 }
@@ -942,7 +945,7 @@ void __ref kmemleak_free(const void *ptr)
 {
 	pr_debug("%s(0x%p)\n", __func__, ptr);
 
-	if (kmemleak_enabled && ptr && !IS_ERR(ptr))
+	if (kmemleak_free_enabled && ptr && !IS_ERR(ptr))
 		delete_object_full((unsigned long)ptr);
 	else if (kmemleak_early_log)
 		log_early(KMEMLEAK_FREE, ptr, 0, 0);
@@ -982,7 +985,7 @@ void __ref kmemleak_free_percpu(const void __percpu *ptr)
 
 	pr_debug("%s(0x%p)\n", __func__, ptr);
 
-	if (kmemleak_enabled && ptr && !IS_ERR(ptr))
+	if (kmemleak_free_enabled && ptr && !IS_ERR(ptr))
 		for_each_possible_cpu(cpu)
 			delete_object_full((unsigned long)per_cpu_ptr(ptr,
 								      cpu));
@@ -1750,6 +1753,13 @@ static void kmemleak_do_cleanup(struct work_struct *work)
 	mutex_lock(&scan_mutex);
 	stop_scan_thread();
 
+	/*
+	 * Once the scan thread has stopped, it is safe to no longer track
+	 * object freeing. Ordering of the scan thread stopping and the memory
+	 * accesses below is guaranteed by the kthread_stop() function.
+	 */
+	kmemleak_free_enabled = 0;
+
 	if (!kmemleak_found_leaks)
 		__kmemleak_do_cleanup();
 	else
@@ -1776,6 +1786,8 @@ static void kmemleak_disable(void)
 	/* check whether it is too early for a kernel thread */
 	if (kmemleak_initialized)
 		schedule_work(&cleanup_work);
+	else
+		kmemleak_free_enabled = 0;
 
 	pr_info("Kernel memory leak detector disabled\n");
 }
@@ -1840,8 +1852,10 @@ void __init kmemleak_init(void)
 	if (kmemleak_error) {
 		local_irq_restore(flags);
 		return;
-	} else
+	} else {
 		kmemleak_enabled = 1;
+		kmemleak_free_enabled = 1;
+	}
 	local_irq_restore(flags);
 
 	/*