Index: lib/libusb/libusb10.c
===================================================================
--- lib/libusb/libusb10.c	(revision 338540)
+++ lib/libusb/libusb10.c	(working copy)
@@ -114,6 +114,19 @@
 	fcntl(f, F_SETFL, flags);
 }
 
+static void
+libusb10_wakeup_event_loop(libusb_context *ctx)
+{
+	uint8_t dummy = 0;
+	int err;
+
+	err = write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
+	if (err < (int)sizeof(dummy)) {
+		/* ignore error, if any */
+		DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "Waking up event loop failed!");
+	}
+}
+
 int
 libusb_init(libusb_context **context)
 {
@@ -484,7 +497,6 @@
 {
 	libusb_context *ctx = dev->ctx;
 	struct libusb20_device *pdev = dev->os_priv;
-	uint8_t dummy;
 	int err;
 
 	if (devh == NULL)
@@ -506,12 +518,8 @@
 	    POLLOUT | POLLRDNORM | POLLWRNORM);
 
 	/* make sure our event loop detects the new device */
-	dummy = 0;
-	err = write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
-	if (err < (int)sizeof(dummy)) {
-		/* ignore error, if any */
-		DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_open write failed!");
-	}
+	libusb10_wakeup_event_loop(ctx);
+
 	*devh = pdev;
 
 	return (0);
@@ -564,8 +572,6 @@
 {
 	libusb_context *ctx;
 	struct libusb_device *dev;
-	uint8_t dummy;
-	int err;
 
 	if (pdev == NULL)
 		return;			/* be NULL safe */
@@ -581,12 +587,7 @@
 	libusb_unref_device(dev);
 
 	/* make sure our event loop detects the closed device */
-	dummy = 0;
-	err = write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
-	if (err < (int)sizeof(dummy)) {
-		/* ignore error, if any */
-		DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_close write failed!");
-	}
+	libusb10_wakeup_event_loop(ctx);
 }
 
 libusb_device *
@@ -1314,7 +1315,6 @@
 	int buffsize;
 	int maxframe;
 	int temp;
-	uint8_t dummy;
 
 	dev = libusb_get_device(pdev);
 
@@ -1415,10 +1415,8 @@
 
 failure:
 	libusb10_complete_transfer(pxfer0, sxfer, LIBUSB_TRANSFER_ERROR);
-
 	/* make sure our event loop spins the done handler */
-	dummy = 0;
-	err = write(dev->ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
+	libusb10_wakeup_event_loop(dev->ctx);
 }
 
 /* The following function must be called unlocked */
@@ -1490,6 +1488,7 @@
 	struct libusb20_transfer *pxfer1;
 	struct libusb_super_transfer *sxfer;
 	struct libusb_device *dev;
+	struct libusb_device_handle *devh;
 	uint8_t endpoint;
 	int retval;
 
@@ -1497,12 +1496,12 @@
 		return (LIBUSB_ERROR_INVALID_PARAM);
 
 	/* check if not initialised */
-	if (uxfer->dev_handle == NULL)
+	if ((devh = uxfer->dev_handle) == NULL)
 		return (LIBUSB_ERROR_NOT_FOUND);
 
 	endpoint = uxfer->endpoint;
 
-	dev = libusb_get_device(uxfer->dev_handle);
+	dev = libusb_get_device(devh);
 
 	DPRINTF(dev->ctx, LIBUSB_DEBUG_FUNCTION, "libusb_cancel_transfer enter");
 
@@ -1513,8 +1512,8 @@
 
 	CTX_LOCK(dev->ctx);
 
-	pxfer0 = libusb10_get_transfer(uxfer->dev_handle, endpoint, 0);
-	pxfer1 = libusb10_get_transfer(uxfer->dev_handle, endpoint, 1);
+	pxfer0 = libusb10_get_transfer(devh, endpoint, 0);
+	pxfer1 = libusb10_get_transfer(devh, endpoint, 1);
 
 	if (sxfer->state != LIBUSB_SUPER_XFER_ST_PEND) {
 		/* only update the transfer status */
@@ -1526,6 +1525,8 @@
 		sxfer->entry.tqe_prev = NULL;
 		libusb10_complete_transfer(NULL,
 		    sxfer, LIBUSB_TRANSFER_CANCELLED);
+		/* make sure our event loop spins the done handler */
+		libusb10_wakeup_event_loop(dev->ctx);
 	} else if (pxfer0 == NULL || pxfer1 == NULL) {
 		/* not started */
 		retval = LIBUSB_ERROR_NOT_FOUND;
@@ -1532,17 +1533,30 @@
 	} else if (libusb20_tr_get_priv_sc1(pxfer0) == sxfer) {
 		libusb10_complete_transfer(pxfer0,
 		    sxfer, LIBUSB_TRANSFER_CANCELLED);
-		libusb20_tr_stop(pxfer0);
-		/* make sure the queue doesn't stall */
-		libusb10_submit_transfer_sub(
-		    uxfer->dev_handle, endpoint);
+		if (libusb20_dev_check_connected(devh)) {
+			/* clear transfer pointer */
+			libusb20_tr_set_priv_sc1(pxfer0, NULL);
+			/* make sure our event loop spins the done handler */
+			libusb10_wakeup_event_loop(dev->ctx);
+		} else {
+			libusb20_tr_stop(pxfer0);
+			/* make sure the queue doesn't stall */
+			libusb10_submit_transfer_sub(devh, endpoint);
+		}
 	} else if (libusb20_tr_get_priv_sc1(pxfer1) == sxfer) {
 		libusb10_complete_transfer(pxfer1,
 		    sxfer, LIBUSB_TRANSFER_CANCELLED);
-		libusb20_tr_stop(pxfer1);
-		/* make sure the queue doesn't stall */
-		libusb10_submit_transfer_sub(
-		    uxfer->dev_handle, endpoint);
+		/* check if handle is still active */
+		if (libusb20_dev_check_connected(devh)) {
+			/* clear transfer pointer */
+			libusb20_tr_set_priv_sc1(pxfer1, NULL);
+			/* make sure our event loop spins the done handler */
+			libusb10_wakeup_event_loop(dev->ctx);
+		} else {
+			libusb20_tr_stop(pxfer1);
+			/* make sure the queue doesn't stall */
+			libusb10_submit_transfer_sub(devh, endpoint);
+		}
 	} else {
 		/* not started */
 		retval = LIBUSB_ERROR_NOT_FOUND;
Index: lib/libusb/libusb10_io.c
===================================================================
--- lib/libusb/libusb10_io.c	(revision 338540)
+++ lib/libusb/libusb10_io.c	(working copy)
@@ -161,17 +161,13 @@
 		if (ppdev[i] != NULL) {
 			dev = libusb_get_device(ppdev[i]);
 
-			if (fds[i].revents == 0)
-				err = 0;	/* nothing to do */
-			else
+			if (fds[i].revents != 0) {
 				err = libusb20_dev_process(ppdev[i]);
 
-			if (err) {
-				/* cancel all transfers - device is gone */
-				libusb10_cancel_all_transfer(dev);
-
-				/* remove USB device from polling loop */
-				libusb10_remove_pollfd(dev->ctx, &dev->dev_poll);
+				if (err) {
+					/* remove USB device from polling loop */
+					libusb10_remove_pollfd(dev->ctx, &dev->dev_poll);
+				}
 			}
 			CTX_UNLOCK(ctx);
 			libusb_unref_device(dev);
@@ -180,10 +176,8 @@
 		} else {
 			uint8_t dummy;
 
-			while (1) {
-				if (read(fds[i].fd, &dummy, 1) != 1)
-					break;
-			}
+			while (read(fds[i].fd, &dummy, 1) == 1)
+				;
 		}
 	}