thodg/cgminer

diff --git a/miner.h b/miner.h
index fdfc779..7bafed0 100644
--- a/miner.h
+++ b/miner.h
@@ -481,6 +481,12 @@ struct cgpu_info {
 #endif
 #ifdef USE_USBUTILS
 	struct cg_usb_info usbinfo;
+	int usb_bulk_writes;
+	int usb_bulk_reads;
+	int usb_wlock_total_wait;
+	int usb_rlock_total_wait;
+	int usb_wlock_max_wait;
+	int usb_rlock_max_wait;
 #endif
 #ifdef USE_MODMINER
 	char fpgaid;
diff --git a/usbutils.c b/usbutils.c
index c93e920..9f1c37a 100644
--- a/usbutils.c
+++ b/usbutils.c
@@ -2301,8 +2301,18 @@ int _usb_read(struct cgpu_info *cgpu, int intinfo, int epinfo, char *buf, size_t
 	int endlen;
 	unsigned char *ptr, *usbbuf = cgpu->usbinfo.bulkbuf;
 	size_t usbbufread;
+	int lock_wait;
 
+	/* Get statistics on how long reads wait on the devlock */
+	cgpu->usb_bulk_reads++;
+
+	cgtime(&read_start);
 	DEVLOCK(cgpu, pstate);
+	cgtime(&tv_finish);
+	lock_wait = ms_tdiff(&tv_finish, &read_start);
+	cgpu->usb_rlock_total_wait += lock_wait;
+	if (lock_wait > cgpu->usb_rlock_max_wait)
+		cgpu->usb_rlock_max_wait = lock_wait;
 
 	if (cgpu->usbinfo.nodev) {
 		*buf = '\0';
@@ -2572,8 +2582,18 @@ int _usb_write(struct cgpu_info *cgpu, int intinfo, int epinfo, char *buf, size_
 	double max, done;
 	__maybe_unused bool first = true;
 	int err, sent, tot, pstate;
+	int lock_wait;
 
+	/* Get statistics on how long writes wait on the devlock */
+	cgpu->usb_bulk_writes++;
+
+	cgtime(&read_start);
 	DEVLOCK(cgpu, pstate);
+	cgtime(&tv_finish);
+	lock_wait = ms_tdiff(&tv_finish, &read_start);
+	cgpu->usb_wlock_total_wait += lock_wait;
+	if (lock_wait > cgpu->usb_wlock_max_wait)
+		cgpu->usb_wlock_max_wait = lock_wait;
 
 	USBDEBUG("USB debug: _usb_write(%s (nodev=%s),intinfo=%d,epinfo=%d,buf='%s',bufsiz=%d,proc=%p,timeout=%u,cmd=%s)", cgpu->drv->name, bool_str(cgpu->usbinfo.nodev), intinfo, epinfo, (char *)str_text(buf), (int)bufsiz, processed, timeout, usb_cmdname(cmd));