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Commit 2e251341 authored by Daniel Glöckner's avatar Daniel Glöckner Committed by Greg Kroah-Hartman
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USB: gadget: g_serial: append zlp when tx buffer becomes empty 



Some usb serial host drivers expect a short packet before they forward
the data to the application. This is caused by them trying to read more
than one packet at a time. So when the gadget sends an exact multiple
of the maximum packet size, it should append a zero-length packet.

Signed-off-by: default avatarDaniel Glöckner <dg@emlix.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 9b8e7ba6

drivers/usb/gadget/u_serial.c

+1 −0
Original line number Diff line number Diff line
@@ -371,6 +371,7 @@ __acquires(&port->port_lock) 


		req->length = len;

		list_del(&req->list);

		req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0);



		pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",

				port->port_num, len, *((u8 *)req->buf),