forge/linux-uconsole
1
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source 
[ Upstream commit 755915fc28 ]

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: b84a8dee23 ("usb: gadget: add Faraday fotg210_udc driver")
Signed-off-by: Fabian Vogt <fabian@ritter-vogt.de>
Link: https://lore.kernel.org/r/20210324141115.9384-2-fabian@ritter-vogt.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fabian Vogt 2021-03-24 15:11:09 +01:00 • committed by Greg Kroah-Hartman
commit 01c66e8340
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/usb/gadget/udc/fotg210-udc.c
View file

@ -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,