linux-kernel - [045/200] USB: mxc: gadget: Fix bitfield for calculating maximum packet size

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Message-Id: <20100701174250.222358881@clark.site>
Date:	Thu, 01 Jul 2010 10:42:15 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dinh Nguyen <Dinh.Nguyen@...escale.com>
Subject: [045/200] USB: mxc: gadget: Fix bitfield for calculating maximum packet size

2.6.34-stable review patch.  If anyone has any objections, please let me know.

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

From: Dinh Nguyen <Dinh.Nguyen@...escale.com>

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@...escale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 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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