Merge 4.4.260 into android-4.4-p

Changes in 4.4.260
	futex: Ensure the correct return value from futex_lock_pi()
	net: usb: qmi_wwan: support ZTE P685M modem
	iwlwifi: pcie: fix to correct null check
	mmc: sdhci-esdhc-imx: fix kernel panic when remove module
	scripts: use pkg-config to locate libcrypto
	scripts: set proper OpenSSL include dir also for sign-file
	hugetlb: fix update_and_free_page contig page struct assumption
	JFS: more checks for invalid superblock
	xfs: Fix assert failure in xfs_setattr_size()
	net: fix up truesize of cloned skb in skb_prepare_for_shift()
	mm/hugetlb.c: fix unnecessary address expansion of pmd sharing
	staging: fwserial: Fix error handling in fwserial_create
	x86/reboot: Add Zotac ZBOX CI327 nano PCI reboot quirk
	vt/consolemap: do font sum unsigned
	wlcore: Fix command execute failure 19 for wl12xx
	pktgen: fix misuse of BUG_ON() in pktgen_thread_worker()
	ath10k: fix wmi mgmt tx queue full due to race condition
	x86/build: Treat R_386_PLT32 relocation as R_386_PC32
	Bluetooth: Fix null pointer dereference in amp_read_loc_assoc_final_data
	staging: most: sound: add sanity check for function argument
	media: uvcvideo: Allow entities with no pads
	scsi: iscsi: Restrict sessions and handles to admin capabilities
	sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
	scsi: iscsi: Ensure sysfs attributes are limited to PAGE_SIZE
	scsi: iscsi: Verify lengths on passthrough PDUs
	Xen/gnttab: handle p2m update errors on a per-slot basis
	xen-netback: respect gnttab_map_refs()'s return value
	zsmalloc: account the number of compacted pages correctly
	swap: fix swapfile read/write offset
	media: v4l: ioctl: Fix memory leak in video_usercopy
	Linux 4.4.260

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic12a2f4dc153baf99cb1716d41b4dd6024ad4317

1 files changed, 55 insertions, 0 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 666986b95c5d..300cdbdc8494 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -17,6 +17,7 @@
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/seq_file.h>
+#include <linux/mm.h>
 
 #include "sysfs.h"
 #include "../kernfs/kernfs-internal.h"
@@ -549,3 +550,57 @@ void sysfs_remove_bin_file(struct kobject *kobj,
 	kernfs_remove_by_name(kobj->sd, attr->attr.name);
 }
 EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);
+
+/**
+ *	sysfs_emit - scnprintf equivalent, aware of PAGE_SIZE buffer.
+ *	@buf:	start of PAGE_SIZE buffer.
+ *	@fmt:	format
+ *	@...:	optional arguments to @format
+ *
+ *
+ * Returns number of characters written to @buf.
+ */
+int sysfs_emit(char *buf, const char *fmt, ...)
+{
+	va_list args;
+	int len;
+
+	if (WARN(!buf || offset_in_page(buf),
+		 "invalid sysfs_emit: buf:%p\n", buf))
+		return 0;
+
+	va_start(args, fmt);
+	len = vscnprintf(buf, PAGE_SIZE, fmt, args);
+	va_end(args);
+
+	return len;
+}
+EXPORT_SYMBOL_GPL(sysfs_emit);
+
+/**
+ *	sysfs_emit_at - scnprintf equivalent, aware of PAGE_SIZE buffer.
+ *	@buf:	start of PAGE_SIZE buffer.
+ *	@at:	offset in @buf to start write in bytes
+ *		@at must be >= 0 && < PAGE_SIZE
+ *	@fmt:	format
+ *	@...:	optional arguments to @fmt
+ *
+ *
+ * Returns number of characters written starting at &@buf[@at].
+ */
+int sysfs_emit_at(char *buf, int at, const char *fmt, ...)
+{
+	va_list args;
+	int len;
+
+	if (WARN(!buf || offset_in_page(buf) || at < 0 || at >= PAGE_SIZE,
+		 "invalid sysfs_emit_at: buf:%p at:%d\n", buf, at))
+		return 0;
+
+	va_start(args, fmt);
+	len = vscnprintf(buf + at, PAGE_SIZE - at, fmt, args);
+	va_end(args);
+
+	return len;
+}
+EXPORT_SYMBOL_GPL(sysfs_emit_at);