diff options
| author | Fabian Vogt <fabian@ritter-vogt.de> | 2021-03-24 15:11:09 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-26 14:43:47 +0100 |
| commit | 755915fc28edfc608fa89a163014acb2f31c1e19 (patch) | |
| tree | 19f1045ec193cb44ae2a18a5e36d85637881bee4 /drivers/usb/gadget | |
| parent | 12c30bb016a819893387b0b5c97d12bc21dfbf97 (diff) | |
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 <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>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/udc/fotg210-udc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/gadget/udc/fotg210-udc.c b/drivers/usb/gadget/udc/fotg210-udc.c index d6ca50f01985..39260007ebf8 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, |