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usb: dwc2: Don't program DMA address for 0 length request 

Check the request length in dwc2_hsotg_start_req() function. If
length == 0, do not write DMA address to control register.

Signed-off-by: Razmik Karapetyan <razmik@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Razmik Karapetyan 2016-11-16 15:33:55 -08:00 committed by Felipe Balbi
parent 9d8da85798
commit 729e65746d
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/dwc2/gadget.c
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@ -1018,7 +1018,7 @@ static void dwc2_hsotg_start_req(struct dwc2_hsotg *hsotg,
/* write size / packets */
dwc2_writel(epsize, hsotg->regs + epsize_reg);
if (using_dma(hsotg) && !continuing) {
if (using_dma(hsotg) && !continuing && (length != 0)) {
/*
* write DMA address to control register, buffer
* already synced by dwc2_hsotg_ep_queue().