From: Fabian Vogt Date: Wed, 24 Mar 2021 14:11:09 +0000 (+0100) Subject: fotg210-udc: Fix DMA on EP0 for length > max packet size X-Git-Tag: v5.15~1313^2~160 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=755915fc28edfc608fa89a163014acb2f31c1e19;p=platform%2Fkernel%2Flinux-starfive.git 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: b84a8dee23fd ("usb: gadget: add Faraday fotg210_udc driver") Signed-off-by: Fabian Vogt Link: https://lore.kernel.org/r/20210324141115.9384-2-fabian@ritter-vogt.de Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/udc/fotg210-udc.c b/drivers/usb/gadget/udc/fotg210-udc.c index d6ca50f..3926000 100644 --- a/drivers/usb/gadget/udc/fotg210-udc.c +++ b/drivers/usb/gadget/udc/fotg210-udc.c @@ -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,