From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Felipe Balbi" , "Nicolas Ferre" , "Bo Shen" Date: Tue, 17 Feb 2015 01:46:53 +0000 Message-ID: Subject: [PATCH 3.2 100/152] usb: gadget: udc: atmel: fix possible IN hang issue In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.2.67-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Bo Shen 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 Signed-off-by: Bo Shen Signed-off-by: Felipe Balbi [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings --- drivers/usb/gadget/atmel_usba_udc.c | 1 - 1 file changed, 1 deletion(-) --- a/drivers/usb/gadget/atmel_usba_udc.c +++ b/drivers/usb/gadget/atmel_usba_udc.c @@ -1597,7 +1597,6 @@ 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); } }