| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 149/183] usb: gadget: udc: atmel: fix possible IN hang issue | Date | Sun, 25 Jan 2015 10:07:51 -0800 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Bo Shen <voice.shen@atmel.com>
commit 6785a1034461c2d2c205215f63a50a740896e55b upstream.
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.
Fixes: 914a3f3b3754 (USB: add atmel_usba_udc driver) Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Bo Shen <voice.shen@atmel.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/gadget/udc/atmel_usba_udc.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c @@ -1572,7 +1572,6 @@ static void usba_ep_irq(struct usba_udc 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); } }
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