linux-kernel - [PATCH] USB: FIX bitfield istl

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Message-ID: <4B03F2BF.4000402@gmail.com>
Date:	Wed, 18 Nov 2009 14:12:31 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Mike Frysinger <vapier@...too.org>, gregkh@...e.de,
	linux-usb@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] USB: FIX bitfield istl_flip:1, make it unsigned.

istl_flip is a signed bitfield of one bit so it can be -1 or 0.
However in drivers/usb/host/isp1362-hcd.c:1103:

finish_iso_transfers(isp1362_hcd,
	&isp1362_hcd->istl_queue[isp1362_hcd->istl_flip]);

So if isp1362_hcd->istl_flip is set, the 2nd argument becomes
&isp1362_hcd->istl_queue[-1], which is invalid.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
FYI:
drivers/usb/host/isp1362.h:543:
struct isp1362_hcd {
...
	struct isp1362_ep_queue istl_queue[2];
};

The change of the other bitfield may not be strictly necessary
but is preferred, I thought.

Roel

diff --git a/drivers/usb/host/isp1362.h b/drivers/usb/host/isp1362.h
index 1a253eb..5151516 100644
--- a/drivers/usb/host/isp1362.h
+++ b/drivers/usb/host/isp1362.h
@@ -534,8 +534,8 @@ struct isp1362_hcd {
 
 	/* periodic schedule: isochronous */
 	struct list_head	isoc;
-	int			istl_flip:1;
-	int			irq_active:1;
+	unsigned int		istl_flip:1;
+	unsigned int		irq_active:1;
 
 	/* Schedules for the current frame */
 	struct isp1362_ep_queue atl_queue;
--
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