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UPSTREAM: usb: dwc3: gadget: Handle 0 xfer length for OUT EP

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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.

Change-Id: I9dff2dabdbe1c5cd86ef213356bcbefe90d0e1be
Fixes: c6267a5163 ("usb: dwc3: gadget: align transfers to wMaxPacketSize")
Cc: stable@vger.kernel.org
Signed-off-by: Tejas Joglekar <joglekar@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
(cherry picked from commit 1e19cdc806)
This commit is contained in:
Tejas Joglekar
2019-01-22 13:26:51 +05:30
committed by Tao Huang
parent 1ece9bc9ac
commit b0073d70ef
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/dwc3/gadget.c
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@@ -1111,7 +1111,7 @@ 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;