Commit 1e19cdc8 authored by Tejas Joglekar's avatar Tejas Joglekar Committed by Felipe Balbi
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usb: dwc3: gadget: Handle 0 xfer length for OUT EP 



For OUT endpoints, zero-length transfers require MaxPacketSize buffer as
per the DWC_usb3 programming guide 3.30a section 4.2.3.3.

This patch fixes this by explicitly checking zero length
transfer to correctly pad up to MaxPacketSize.

Fixes: c6267a51 ("usb: dwc3: gadget: align transfers to wMaxPacketSize")
Cc: stable@vger.kernel.org

Signed-off-by: default avatarTejas Joglekar <joglekar@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent f17b5f06

drivers/usb/dwc3/gadget.c

+1 −1
Original line number Diff line number Diff line
@@ -1119,7 +1119,7 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep, 
	unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);

	unsigned int rem = length % maxp;



	if (rem && usb_endpoint_dir_out(dep->endpoint.desc)) {

	if ((!length || rem) && usb_endpoint_dir_out(dep->endpoint.desc)) {

		struct dwc3	*dwc = dep->dwc;

		struct dwc3_trb	*trb;