Commit 1e19cdc8 authored by Tejas Joglekar's avatar Tejas Joglekar Committed by Felipe Balbi

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
...@@ -1119,7 +1119,7 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep, ...@@ -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 maxp = usb_endpoint_maxp(dep->endpoint.desc);
unsigned int rem = length % maxp; 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 *dwc = dep->dwc;
struct dwc3_trb *trb; struct dwc3_trb *trb;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment