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authorFabian Vogt <fabian@ritter-vogt.de>2021-03-24 15:11:09 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-03-26 14:43:47 +0100
commit755915fc28edfc608fa89a163014acb2f31c1e19 (patch)
tree19f1045ec193cb44ae2a18a5e36d85637881bee4 /drivers/usb/gadget
parentdt-bindings: usb: qcom,dwc3: Add bindings for SC7280 (diff)
downloadlinux-755915fc28edfc608fa89a163014acb2f31c1e19.tar.xz
linux-755915fc28edfc608fa89a163014acb2f31c1e19.zip
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.c2
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,