Messages in this thread Patch in this message | | | From | Bo Shen <> | Subject | [PATCH 2/2] USB: gadget: udc: atmel: fix possible IN hang issue | Date | Wed, 17 Dec 2014 17:18:49 +0800 |
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When receive data, the RXRDY in status register set by hardware after a new packet has been stored in the endpoint FIFO. When it is copied from FIFO, this bit is cleared which make the FIFO can be accessed again.
In the receive_data() function, this bit RXRDY has been cleared. So, after the receive_data() function return, this bit should not be cleared again, or else it may cause the accessing FIFO corrupt, which will make the data loss.
Signed-off-by: Bo Shen <voice.shen@atmel.com> ---
drivers/usb/gadget/udc/atmel_usba_udc.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c index 63e90f5..93328ea 100644 --- a/drivers/usb/gadget/udc/atmel_usba_udc.c +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c @@ -1563,7 +1563,6 @@ static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep) if ((epstatus & epctrl) & USBA_RX_BK_RDY) { DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name); receive_data(ep); - usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY); } } -- 2.1.0.24.g4109c28
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