usb: gadget: udc: atmel: fix possible IN hang issue
authorBo Shen <voice.shen@atmel.com>
Wed, 17 Dec 2014 09:18:49 +0000 (17:18 +0800)
committerFelipe Balbi <balbi@ti.com>
Mon, 22 Dec 2014 16:41:15 +0000 (10:41 -0600)
commit6785a1034461c2d2c205215f63a50a740896e55b
treece268162cac862c48ce60b1d7ac2b963efadaaa9
parentf40afdddeb6c54ffd1e2920a5e93e363d6748db6
usb: gadget: udc: atmel: fix possible IN hang issue

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)
Cc: <stable@vger.kernel.org> # 2.6.24+
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>
drivers/usb/gadget/udc/atmel_usba_udc.c