diff mbox series

[4/4] usb: gadget: add trace event of configfs write attributes operation

Message ID 1647750904-6524-5-git-send-email-quic_linyyuan@quicinc.com (mailing list archive)
State Superseded
Headers show
Series usb: gadget: configfs: new trace events | expand

Commit Message

Linyu Yuan March 20, 2022, 4:35 a.m. UTC 
Add API trace_usb_configfs_write_attr() to trace user change gadget or
function attributes.

Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
---
 drivers/usb/gadget/configfs.c                  | 47 ++++++++++++++++++++++++++
 drivers/usb/gadget/function/f_acm.c            |  1 +
 drivers/usb/gadget/function/f_hid.c            |  4 +++
 drivers/usb/gadget/function/f_loopback.c       |  4 +++
 drivers/usb/gadget/function/f_mass_storage.c   | 16 +++++++++
 drivers/usb/gadget/function/f_midi.c           |  6 ++++
 drivers/usb/gadget/function/f_printer.c        |  4 +++
 drivers/usb/gadget/function/f_serial.c         |  1 +
 drivers/usb/gadget/function/f_sourcesink.c     | 16 +++++++++
 drivers/usb/gadget/function/f_uac1.c           |  6 ++++
 drivers/usb/gadget/function/f_uac1_legacy.c    |  4 +++
 drivers/usb/gadget/function/f_uac2.c           |  8 +++++
 drivers/usb/gadget/function/u_ether_configfs.h | 10 ++++++
 drivers/usb/gadget/function/uvc_configfs.c     | 18 ++++++++++
 include/linux/usb/composite.h                  |  3 ++
 include/linux/usb/gadget_configfs.h            |  2 ++
 16 files changed, 150 insertions(+)
diff mbox series

Patch

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 0f85290..c35ad0a 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -149,6 +149,8 @@  static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 {							\
 	u8 val;						\
 	int ret;					\
+							\
+	trace_usb_configfs_write_attr(item, #_name, page);	\
 	ret = kstrtou8(page, 0, &val);			\
 	if (ret)					\
 		return ret;				\
@@ -162,6 +164,8 @@  static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
 {							\
 	u16 val;					\
 	int ret;					\
+							\
+	trace_usb_configfs_write_attr(item, #_name, page);	\
 	ret = kstrtou16(page, 0, &val);			\
 	if (ret)					\
 		return ret;				\
@@ -201,6 +205,8 @@  static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
 	u16 bcdDevice;
 	int ret;
 
+	trace_usb_configfs_write_attr(item, "bcdDevice", page);
+
 	ret = kstrtou16(page, 0, &bcdDevice);
 	if (ret)
 		return ret;
@@ -218,6 +224,8 @@  static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
 	u16 bcdUSB;
 	int ret;
 
+	trace_usb_configfs_write_attr(item, "bcdUSB", page);
+
 	ret = kstrtou16(page, 0, &bcdUSB);
 	if (ret)
 		return ret;
@@ -265,6 +273,8 @@  static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 	char *name;
 	int ret;
 
+	trace_usb_configfs_write_attr(item, "UDC", page);
+
 	if (strlen(page) < len)
 		return -EOVERFLOW;
 
@@ -314,6 +324,8 @@  static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
 {
 	struct gadget_info *gi = to_gadget_info(item);
 
+	trace_usb_configfs_write_attr(item, "max_speed", page);
+
 	mutex_lock(&gi->lock);
 
 	/* Prevent changing of max_speed after the driver is binded */
@@ -522,6 +534,9 @@  static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
 	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 	u16 val;
 	int ret;
+
+	trace_usb_configfs_write_attr(item, "MaxPower", page);
+
 	ret = kstrtou16(page, 0, &val);
 	if (ret)
 		return ret;
@@ -545,6 +560,9 @@  static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
 	struct config_usb_cfg *cfg = to_config_usb_cfg(item);
 	u8 val;
 	int ret;
+
+	trace_usb_configfs_write_attr(item, "bmAttributes", page);
+
 	ret = kstrtou8(page, 0, &val);
 	if (ret)
 		return ret;
@@ -812,6 +830,8 @@  static ssize_t os_desc_use_store(struct config_item *item, const char *page,
 	int ret;
 	bool use;
 
+	trace_usb_configfs_write_attr(item, "use", page);
+
 	mutex_lock(&gi->lock);
 	ret = strtobool(page, &use);
 	if (!ret) {
@@ -836,6 +856,8 @@  static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
 	int ret;
 	u8 b_vendor_code;
 
+	trace_usb_configfs_write_attr(item, "b_vendor_code", page);
+
 	mutex_lock(&gi->lock);
 	ret = kstrtou8(page, 0, &b_vendor_code);
 	if (!ret) {
@@ -865,6 +887,8 @@  static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
 	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 	int res, l;
 
+	trace_usb_configfs_write_attr(item, "qw_sign", page);
+
 	l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 	if (page[l - 1] == '\n')
 		--l;
@@ -1806,6 +1830,29 @@  void trace_usb_configfs_unlink_group(struct config_item *dest,
 	trace_usb_configfs_link_unlink_group(dest, src, "unlink");
 }
 EXPORT_SYMBOL(trace_usb_configfs_unlink_group);
+
+void trace_usb_configfs_write_attr(struct config_item *item,
+		const char *attr, const char *page)
+{
+	char *info = kzalloc(2 * PAGE_SIZE, GFP_KERNEL);
+	char *group = kzalloc(GROUP_LEN, GFP_KERNEL);
+	int ret;
+
+	if (!info || !group)
+		goto out;
+
+	ret = gadget_configfs_group(group, item);
+	if (ret)
+		goto out;
+
+	snprintf(info, 2 * PAGE_SIZE, "echo %s/%s %s", group, attr, page);
+
+	trace_gadget_configfs(info);
+
+out:
+	kfree(info);
+}
+EXPORT_SYMBOL(trace_usb_configfs_write_attr);
 #endif
 
 static int __init gadget_cfs_init(void)
diff --git a/drivers/usb/gadget/function/f_acm.c b/drivers/usb/gadget/function/f_acm.c
index 349945e..d48f666 100644
--- a/drivers/usb/gadget/function/f_acm.c
+++ b/drivers/usb/gadget/function/f_acm.c
@@ -794,6 +794,7 @@  static struct configfs_item_operations acm_item_ops = {
 static ssize_t f_acm_console_store(struct config_item *item,
 		const char *page, size_t count)
 {
+	trace_usb_configfs_write_attr(item, "console", page);
 	return gserial_set_console(to_f_serial_opts(item)->port_num,
 				   page, count);
 }
diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index ca0a7d9..c54af8d 100644
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -1074,6 +1074,8 @@  static ssize_t f_hid_opts_##name##_store(struct config_item *item,	\
 	int ret;							\
 	u##prec num;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -1123,6 +1125,8 @@  static ssize_t f_hid_opts_report_desc_store(struct config_item *item,
 	int ret = -EBUSY;
 	char *d;
 
+	trace_usb_configfs_write_attr(item, "report_desc", page);
+
 	mutex_lock(&opts->lock);
 
 	if (opts->refcnt)
diff --git a/drivers/usb/gadget/function/f_loopback.c b/drivers/usb/gadget/function/f_loopback.c
index ae41f55..42f6061 100644
--- a/drivers/usb/gadget/function/f_loopback.c
+++ b/drivers/usb/gadget/function/f_loopback.c
@@ -489,6 +489,8 @@  static ssize_t f_lb_opts_qlen_store(struct config_item *item,
 	int ret;
 	u32 num;
 
+	trace_usb_configfs_write_attr(item, "qlen", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -527,6 +529,8 @@  static ssize_t f_lb_opts_bulk_buflen_store(struct config_item *item,
 	int ret;
 	u32 num;
 
+	trace_usb_configfs_write_attr(item, "bulk_buflen", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index 8bf1f37..edece4f 100644
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -3140,6 +3140,8 @@  static ssize_t fsg_lun_opts_file_store(struct config_item *item,
 	struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
 	struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
 
+	trace_usb_configfs_write_attr(item, "file", page);
+
 	return fsg_store_file(opts->lun, &fsg_opts->common->filesem, page, len);
 }
 
@@ -3156,6 +3158,8 @@  static ssize_t fsg_lun_opts_ro_store(struct config_item *item,
 	struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
 	struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
 
+	trace_usb_configfs_write_attr(item, "ro", page);
+
 	return fsg_store_ro(opts->lun, &fsg_opts->common->filesem, page, len);
 }
 
@@ -3170,6 +3174,8 @@  static ssize_t fsg_lun_opts_removable_show(struct config_item *item,
 static ssize_t fsg_lun_opts_removable_store(struct config_item *item,
 				       const char *page, size_t len)
 {
+	trace_usb_configfs_write_attr(item, "removable", page);
+
 	return fsg_store_removable(to_fsg_lun_opts(item)->lun, page, len);
 }
 
@@ -3186,6 +3192,8 @@  static ssize_t fsg_lun_opts_cdrom_store(struct config_item *item,
 	struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
 	struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
 
+	trace_usb_configfs_write_attr(item, "cdrom", page);
+
 	return fsg_store_cdrom(opts->lun, &fsg_opts->common->filesem, page,
 			       len);
 }
@@ -3200,6 +3208,8 @@  static ssize_t fsg_lun_opts_nofua_show(struct config_item *item, char *page)
 static ssize_t fsg_lun_opts_nofua_store(struct config_item *item,
 				       const char *page, size_t len)
 {
+	trace_usb_configfs_write_attr(item, "nofua", page);
+
 	return fsg_store_nofua(to_fsg_lun_opts(item)->lun, page, len);
 }
 
@@ -3214,6 +3224,8 @@  static ssize_t fsg_lun_opts_inquiry_string_show(struct config_item *item,
 static ssize_t fsg_lun_opts_inquiry_string_store(struct config_item *item,
 						 const char *page, size_t len)
 {
+	trace_usb_configfs_write_attr(item, "inquiry_string", page);
+
 	return fsg_store_inquiry_string(to_fsg_lun_opts(item)->lun, page, len);
 }
 
@@ -3352,6 +3364,8 @@  static ssize_t fsg_opts_stall_store(struct config_item *item, const char *page,
 	int ret;
 	bool stall;
 
+	trace_usb_configfs_write_attr(item, "stall", page);
+
 	mutex_lock(&opts->lock);
 
 	if (opts->refcnt) {
@@ -3392,6 +3406,8 @@  static ssize_t fsg_opts_num_buffers_store(struct config_item *item,
 	int ret;
 	u8 num;
 
+	trace_usb_configfs_write_attr(item, "num_buffers", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index fddf539..ebb2d7b 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -1110,6 +1110,8 @@  static ssize_t f_midi_opts_##name##_store(struct config_item *item,	\
 	int ret;							\
 	u32 num;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt > 1) {						\
 		ret = -EBUSY;						\
@@ -1154,6 +1156,8 @@  static ssize_t f_midi_opts_##name##_store(struct config_item *item,	\
 	int ret;							\
 	s32 num;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt > 1) {						\
 		ret = -EBUSY;						\
@@ -1209,6 +1213,8 @@  static ssize_t f_midi_opts_id_store(struct config_item *item,
 	int ret;
 	char *c;
 
+	trace_usb_configfs_write_attr(item, "id", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt > 1) {
 		ret = -EBUSY;
diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index abec5c5..c071574 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -1239,6 +1239,8 @@  static ssize_t f_printer_opts_pnp_string_store(struct config_item *item,
 	char *new_pnp;
 	int result;
 
+	trace_usb_configfs_write_attr(item, "pnp_string", page);
+
 	mutex_lock(&opts->lock);
 
 	new_pnp = kstrndup(page, len, GFP_KERNEL);
@@ -1281,6 +1283,8 @@  static ssize_t f_printer_opts_q_len_store(struct config_item *item,
 	int ret;
 	u16 num;
 
+	trace_usb_configfs_write_attr(item, "q_len", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
diff --git a/drivers/usb/gadget/function/f_serial.c b/drivers/usb/gadget/function/f_serial.c
index a9480b9..58f69a7 100644
--- a/drivers/usb/gadget/function/f_serial.c
+++ b/drivers/usb/gadget/function/f_serial.c
@@ -271,6 +271,7 @@  static struct configfs_item_operations serial_item_ops = {
 static ssize_t f_serial_console_store(struct config_item *item,
 		const char *page, size_t count)
 {
+	trace_usb_configfs_write_attr(item, "console", page);
 	return gserial_set_console(to_f_serial_opts(item)->port_num,
 				   page, count);
 }
diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
index 6803cd6..4e6acd7 100644
--- a/drivers/usb/gadget/function/f_sourcesink.c
+++ b/drivers/usb/gadget/function/f_sourcesink.c
@@ -907,6 +907,8 @@  static ssize_t f_ss_opts_pattern_store(struct config_item *item,
 	int ret;
 	u8 num;
 
+	trace_usb_configfs_write_attr(item, "pattern", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -950,6 +952,8 @@  static ssize_t f_ss_opts_isoc_interval_store(struct config_item *item,
 	int ret;
 	u8 num;
 
+	trace_usb_configfs_write_attr(item, "isoc_interval", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -993,6 +997,8 @@  static ssize_t f_ss_opts_isoc_maxpacket_store(struct config_item *item,
 	int ret;
 	u16 num;
 
+	trace_usb_configfs_write_attr(item, "isoc_maxpacket", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -1036,6 +1042,8 @@  static ssize_t f_ss_opts_isoc_mult_store(struct config_item *item,
 	int ret;
 	u8 num;
 
+	trace_usb_configfs_write_attr(item, "isoc_mult", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -1079,6 +1087,8 @@  static ssize_t f_ss_opts_isoc_maxburst_store(struct config_item *item,
 	int ret;
 	u8 num;
 
+	trace_usb_configfs_write_attr(item, "isoc_maxburst", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -1122,6 +1132,8 @@  static ssize_t f_ss_opts_bulk_buflen_store(struct config_item *item,
 	int ret;
 	u32 num;
 
+	trace_usb_configfs_write_attr(item, "bulk_buflen", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -1160,6 +1172,8 @@  static ssize_t f_ss_opts_bulk_qlen_store(struct config_item *item,
 	int ret;
 	u32 num;
 
+	trace_usb_configfs_write_attr(item, "bulk_qlen", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
@@ -1198,6 +1212,8 @@  static ssize_t f_ss_opts_iso_qlen_store(struct config_item *item,
 	int ret;
 	u32 num;
 
+	trace_usb_configfs_write_attr(item, "iso_qlen", page);
+
 	mutex_lock(&opts->lock);
 	if (opts->refcnt) {
 		ret = -EBUSY;
diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c
index 6f0e1d8..efbf45f 100644
--- a/drivers/usb/gadget/function/f_uac1.c
+++ b/drivers/usb/gadget/function/f_uac1.c
@@ -1474,6 +1474,8 @@  static ssize_t f_uac1_opts_##name##_store(				\
 	int ret;							\
 	type num;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -1527,6 +1529,8 @@  static ssize_t f_uac1_opts_##name##_store(struct config_item *item,	\
 	u32 num;							\
 	int i;								\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -1573,6 +1577,8 @@  static ssize_t f_uac1_opts_##name##_store(struct config_item *item,	\
 	struct f_uac1_opts *opts = to_f_uac1_opts(item);		\
 	int ret = 0;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
diff --git a/drivers/usb/gadget/function/f_uac1_legacy.c b/drivers/usb/gadget/function/f_uac1_legacy.c
index e2d7f69..a65917b 100644
--- a/drivers/usb/gadget/function/f_uac1_legacy.c
+++ b/drivers/usb/gadget/function/f_uac1_legacy.c
@@ -837,6 +837,8 @@  static ssize_t f_uac1_opts_##name##_store(struct config_item *item,		\
 	int ret;							\
 	u32 num;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -882,6 +884,8 @@  static ssize_t f_uac1_opts_##name##_store(struct config_item *item,	\
 	int ret = -EBUSY;						\
 	char *tmp;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt)						\
 		goto end;						\
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 1905a8d..1849f3b 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -1886,6 +1886,8 @@  static ssize_t f_uac2_opts_##name##_store(struct config_item *item,	\
 	int ret;							\
 	type num;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -1938,6 +1940,8 @@  static ssize_t f_uac2_opts_##name##_store(struct config_item *item,	\
 	struct f_uac2_opts *opts = to_f_uac2_opts(item);		\
 	int ret = 0;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -1995,6 +1999,8 @@  static ssize_t f_uac2_opts_##name##_store(struct config_item *item,	\
 	u32 num;							\
 	int i;								\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
@@ -2041,6 +2047,8 @@  static ssize_t f_uac2_opts_##name##_store(struct config_item *item,	\
 	struct f_uac2_opts *opts = to_f_uac2_opts(item);		\
 	int ret = 0;							\
 									\
+	trace_usb_configfs_write_attr(item, #name, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
diff --git a/drivers/usb/gadget/function/u_ether_configfs.h b/drivers/usb/gadget/function/u_ether_configfs.h
index f558c31..05578be 100644
--- a/drivers/usb/gadget/function/u_ether_configfs.h
+++ b/drivers/usb/gadget/function/u_ether_configfs.h
@@ -45,6 +45,8 @@ 
 		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
 		int ret;						\
 									\
+		trace_usb_configfs_write_attr(item, "dev_addr", page);	\
+									\
 		mutex_lock(&opts->lock);				\
 		if (opts->refcnt) {					\
 			mutex_unlock(&opts->lock);			\
@@ -80,6 +82,8 @@ 
 		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
 		int ret;						\
 									\
+		trace_usb_configfs_write_attr(item, "host_addr", page);	\
+									\
 		mutex_lock(&opts->lock);				\
 		if (opts->refcnt) {					\
 			mutex_unlock(&opts->lock);			\
@@ -115,6 +119,8 @@ 
 		u8 val;							\
 		int ret;						\
 									\
+		trace_usb_configfs_write_attr(item, "qmult", page);	\
+									\
 		mutex_lock(&opts->lock);				\
 		if (opts->refcnt) {					\
 			ret = -EBUSY;					\
@@ -154,6 +160,8 @@  out:									\
 		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
 		int ret = -EBUSY;					\
 									\
+		trace_usb_configfs_write_attr(item, "ifname", page);	\
+									\
 		mutex_lock(&opts->lock);				\
 		if (!opts->refcnt)					\
 			ret = gether_set_ifname(opts->net, page, len);	\
@@ -185,6 +193,8 @@  out:									\
 		int ret = -EINVAL;					\
 		u8 val;							\
 									\
+		trace_usb_configfs_write_attr(item, #_n_, page);		\
+									\
 		mutex_lock(&opts->lock);				\
 		if (sscanf(page, "%02hhx", &val) > 0) {			\
 			opts->_n_ = val;				\
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index fc139f3..6556e42 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -172,6 +172,8 @@  uvcg_control_header_##cname##_store(struct config_item *item,		\
 	int ret;							\
 	u##bits num;							\
 									\
+	trace_usb_configfs_write_attr(item, #cname, page);		\
+									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
 	opts_item = ch->item.ci_parent->ci_parent->ci_parent;		\
@@ -1129,6 +1131,8 @@  static ssize_t  uvcg_frame_##cname##_store(struct config_item *item,	\
 	typeof(f->frame.cname) num;					\
 	int ret;							\
 									\
+	trace_usb_configfs_write_attr(item, #aname, page);		\
+									\
 	ret = kstrtou##bits(page, 0, &num);				\
 	if (ret)							\
 		return ret;						\
@@ -1288,6 +1292,8 @@  static ssize_t uvcg_frame_dw_frame_interval_store(struct config_item *item,
 	int ret = 0, n = 0;
 	u32 *frm_intrv, *tmp;
 
+	trace_usb_configfs_write_attr(item, "dwFrameInterval", page);
+
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */
 
 	opts_item = ch->item.ci_parent->ci_parent->ci_parent->ci_parent;
@@ -1484,6 +1490,8 @@  static ssize_t uvcg_uncompressed_guid_format_store(struct config_item *item,
 	struct mutex *su_mutex = &ch->fmt.group.cg_subsys->su_mutex;
 	int ret;
 
+	trace_usb_configfs_write_attr(item, "guidFormat", page);
+
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */
 
 	opts_item = ch->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;
@@ -1566,6 +1574,8 @@  uvcg_uncompressed_##cname##_store(struct config_item *item,		\
 	int ret;							\
 	u8 num;								\
 									\
+	trace_usb_configfs_write_attr(item, #aname, page);		\
+									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
 	opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
@@ -1613,6 +1623,8 @@  uvcg_uncompressed_bma_controls_store(struct config_item *item,
 				     const char *page, size_t len)
 {
 	struct uvcg_uncompressed *unc = to_uvcg_uncompressed(item);
+
+	trace_usb_configfs_write_attr(item, "bmaControls", page);
 	return uvcg_format_bma_controls_store(&unc->fmt, page, len);
 }
 
@@ -1761,6 +1773,8 @@  uvcg_mjpeg_##cname##_store(struct config_item *item,			\
 	int ret;							\
 	u8 num;								\
 									\
+	trace_usb_configfs_write_attr(item, #aname, page);		\
+									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
 	opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
@@ -1808,6 +1822,8 @@  uvcg_mjpeg_bma_controls_store(struct config_item *item,
 				     const char *page, size_t len)
 {
 	struct uvcg_mjpeg *u = to_uvcg_mjpeg(item);
+
+	trace_usb_configfs_write_attr(item, "bmaControls", page);
 	return uvcg_format_bma_controls_store(&u->fmt, page, len);
 }
 
@@ -2420,6 +2436,8 @@  f_uvc_opts_##cname##_store(struct config_item *item,			\
 	unsigned int num;						\
 	int ret;							\
 									\
+	trace_usb_configfs_write_attr(item, #aname, page);		\
+									\
 	mutex_lock(&opts->lock);					\
 	if (opts->refcnt) {						\
 		ret = -EBUSY;						\
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index a90e626..491e693 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -612,11 +612,14 @@  void trace_usb_configfs_link_group(struct config_item *pitem,
 		struct config_item *item);
 void trace_usb_configfs_unlink_group(struct config_item *pitem,
 		struct config_item *item);
+void trace_usb_configfs_write_attr(struct config_item *item,
+		const char *attr, const char *page);
 #else
 #define trace_usb_configfs_make_group(pitem, item) do {} while(0)
 #define trace_usb_configfs_drop_group(pitem, item) do {} while(0)
 #define trace_usb_configfs_link_group(pitem, item) do {} while(0)
 #define trace_usb_configfs_unlink_group(pitem, item) do {} while(0)
+#define trace_usb_configfs_write_attr(item, attr, page) do {} while(0)
 #endif
 
 struct usb_configuration *usb_get_config(struct usb_composite_dev *cdev,
diff --git a/include/linux/usb/gadget_configfs.h b/include/linux/usb/gadget_configfs.h
index a89f177..2c0663e 100644
--- a/include/linux/usb/gadget_configfs.h
+++ b/include/linux/usb/gadget_configfs.h
@@ -14,6 +14,8 @@  static ssize_t __struct##_##__name##_store(struct config_item *item, \
 	struct __struct *gs = to_##__struct(item);	\
 	int ret;					\
 							\
+	trace_usb_configfs_write_attr(item, #__name, page);	\
+							\
 	ret = usb_string_copy(page, &gs->__name);	\
 	if (ret)					\
 		return ret;				\