[patch 034/149] USB: mxc: gadget: Fix bitfield for calculating maximum packet size

From: Greg KH
Date: Thu Jul 01 2010 - 14:47:41 EST


2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------

From: Dinh Nguyen <Dinh.Nguyen@xxxxxxxxxxxxx>

commit 88e3b59b5adce5b12e205af0e34d518ba0dcdc0c upstream.

The max packet length bit mask used for isochronous endpoints
should be 0x7FF instead of 0x8FF. 0x8FF will actually clear
higher-order bits in the max packet length field.

This patch applies to 2.6.34-rc6.

Signed-off-by: Dinh Nguyen <Dinh.Nguyen@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
drivers/usb/gadget/fsl_udc_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/gadget/fsl_udc_core.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -489,7 +489,7 @@ static int fsl_ep_enable(struct usb_ep *
case USB_ENDPOINT_XFER_ISOC:
/* Calculate transactions needed for high bandwidth iso */
mult = (unsigned char)(1 + ((max >> 11) & 0x03));
- max = max & 0x8ff; /* bit 0~10 */
+ max = max & 0x7ff; /* bit 0~10 */
/* 3 transactions at most */
if (mult > 3)
goto en_done;


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