D39770.1775303516.diff
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	diff --git a/sys/dev/usb/serial/uchcom.c b/sys/dev/usb/serial/uchcom.c
	--- a/sys/dev/usb/serial/uchcom.c
	+++ b/sys/dev/usb/serial/uchcom.c
	@@ -155,6 +155,14 @@

	#define UCHCOM_BULK_BUF_SIZE 1024 /* bytes */

	+/*
	+ * As speeds for uchcom devices increase, these numbers will need to
	+ * be increased. This needs to be tested.
	+ *
	+ * TODO: The TTY buffers should be increased!
	+ */
	+#define UCHCOM_BUF_SIZE 1024
	+
	enum {
	UCHCOM_BULK_DT_WR,
	UCHCOM_BULK_DT_RD,
	@@ -242,6 +250,28 @@
	static usb_callback_t uchcom_read_callback;

	static const struct usb_config uchcom_config_data[UCHCOM_N_TRANSFER] = {
	+ [UCHCOM_BULK_WR] = {
	+ .type = UE_BULK,
	+ .endpoint = UE_ADDR_ANY,
	+ .direction = UE_DIR_TX,
	+ .if_index = 0,
	+ .bufsize = UCHCOM_BUF_SIZE,
	+ .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
	+ .callback = &uchcom_write_callback,
	+ .usb_mode = USB_MODE_DUAL,
	+ },
	+
	+ [UCHCOM_BULK_RD] = {
	+ .type = UE_BULK,
	+ .endpoint = UE_ADDR_ANY,
	+ .direction = UE_DIR_RX,
	+ .if_index = 0,
	+ .bufsize = UCHCOM_BUF_SIZE,
	+ .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
	+ .callback = &uchcom_read_callback,
	+ .usb_mode = USB_MODE_DUAL,
	+ },
	+
	[UCHCOM_BULK_DT_WR] = {
	.type = UE_BULK,
	.endpoint = UE_ADDR_ANY,
	@@ -673,6 +703,12 @@
	uchcom_cfg_open(struct ucom_softc *ucom)
	{
	struct uchcom_softc *sc = ucom->sc_parent;
	+
	+ /* clear stall */
	+ if ((sc->sc_super_ucom.sc_flag & UCOM_FLAG_DEVICE_MODE) == 0) {
	+ usbd_xfer_set_stall(sc->sc_xfer[UCHCOM_BULK_WR]);
	+ usbd_xfer_set_stall(sc->sc_xfer[UCHCOM_BULK_RD]);
	+ }

	DPRINTF("\n");