Commit 755915fc authored by Fabian Vogt's avatar Fabian Vogt Committed by Greg Kroah-Hartman
Browse files

fotg210-udc: Fix DMA on EP0 for length > max packet size 



For a 75 Byte request, it would send the first 64 separately, then detect
that the remaining 11 Byte fit into a single DMA, but due to this bug set
the length to the original 75 Bytes. This leads to a DMA failure (which is
ignored...) and the request completes without the remaining bytes having
been sent.

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/20210324141115.9384-2-fabian@ritter-vogt.de


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 12c30bb0

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

+1 −1
Original line number Diff line number Diff line
@@ -346,7 +346,7 @@ static void fotg210_start_dma(struct fotg210_ep *ep, 
		if (req->req.length - req->req.actual > ep->ep.maxpacket)

			length = ep->ep.maxpacket;

		else

			length = req->req.length;

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

	}



	d = dma_map_single(dev, buffer, length,