aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorTejas Joglekar <tejas.joglekar@synopsys.com>2019-01-22 13:26:51 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-12 19:47:24 +0100
commit19bc535e37295c45339b49e88b695b8b1ad01a35 (patch)
tree94093c60abc715ab36c779b297fbb5a820dc702a
parenta8438c38d7ce62ba1020f4d781f495d583c66317 (diff)
downloadlinux-linaro-stable-19bc535e37295c45339b49e88b695b8b1ad01a35.tar.gz
usb: dwc3: gadget: Handle 0 xfer length for OUT EP
commit 1e19cdc8060227b0802bda6bc0bd22b23679ba32 upstream. 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: c6267a51639b ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/dwc3/gadget.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 105278ccf487..0db90f6f4aa8 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1110,7 +1110,7 @@ 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;