Commit 3e7c2510 authored by Fabian Vogt's avatar Fabian Vogt Committed by Greg Kroah-Hartman
Browse files

fotg210-udc: Don't DMA more than the buffer can take 



Before this, it wrote as much as available into the buffer, even if it
didn't fit.

Fixes: b84a8dee ("usb: gadget: add Faraday fotg210_udc driver")
Signed-off-by: default avatarFabian Vogt <fabian@ritter-vogt.de>
Link: https://lore.kernel.org/r/20210324141115.9384-7-fabian@ritter-vogt.de


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fe8f103a

drivers/usb/gadget/udc/fotg210-udc.c

+3 −2
Original line number Diff line number Diff line
@@ -338,8 +338,9 @@ static void fotg210_start_dma(struct fotg210_ep *ep, 
		} else {

			buffer = req->req.buf + req->req.actual;

			length = ioread32(ep->fotg210->reg +

					FOTG210_FIBCR(ep->epnum - 1));

			length &= FIBCR_BCFX;

					FOTG210_FIBCR(ep->epnum - 1)) & FIBCR_BCFX;

			if (length > req->req.length - req->req.actual)

				length = req->req.length - req->req.actual;

		}

	} else {

		buffer = req->req.buf + req->req.actual;