diff options
| author |   Tejas Joglekar <tejas.joglekar@synopsys.com> | 2019-01-22 13:26:51 +0530 |
|---|---|---|
| committer |   Felipe Balbi <felipe.balbi@linux.intel.com> | 2019-01-28 15:27:07 +0200 |
| commit | 1e19cdc8060227b0802bda6bc0bd22b23679ba32 (patch) | |
| tree | d8f38b00ff465d8a098f147a7950ddcec1251749 /drivers/usb/dwc3 | |
| parent | Linux 5.0-rc4 (diff) | |
| download | linux-dev-1e19cdc8060227b0802bda6bc0bd22b23679ba32.tar.xz linux-dev-1e19cdc8060227b0802bda6bc0bd22b23679ba32.zip | |
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: 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>
Diffstat (limited to 'drivers/usb/dwc3')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index bed2ff42780b..6c9b76bcc2e1 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -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; |