linux-kernel - [PATCH 3.4 090/134] usb: wusbcore: change WA_SEGS

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Message-Id: <20140410032311.307664585@linuxfoundation.org>
Date:	Wed,  9 Apr 2014 20:23:26 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Thomas Pugliese <thomas.pugliese@...il.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 3.4 090/134] usb: wusbcore: change WA_SEGS_MAX to a legal value

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

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

From: Thomas Pugliese <thomas.pugliese@...il.com>

commit f74b75e7f920c700636cccca669c7d16d12e9202 upstream.

change WA_SEGS_MAX to a number that is legal according to the WUSB
spec.

Signed-off-by: Thomas Pugliese <thomas.pugliese@...il.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Yang Yingliang <yangyingliang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/wusbcore/wa-xfer.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/usb/wusbcore/wa-xfer.c
+++ b/drivers/usb/wusbcore/wa-xfer.c
@@ -90,7 +90,8 @@
 #include "wusbhc.h"
 
 enum {
-	WA_SEGS_MAX = 255,
+	/* [WUSB] section 8.3.3 allocates 7 bits for the segment index. */
+	WA_SEGS_MAX = 128,
 };
 
 enum wa_seg_status {
@@ -444,7 +445,7 @@ static ssize_t __wa_xfer_setup_sizes(str
 	xfer->seg_size = (xfer->seg_size / maxpktsize) * maxpktsize;
 	xfer->segs = (urb->transfer_buffer_length + xfer->seg_size - 1)
 		/ xfer->seg_size;
-	if (xfer->segs >= WA_SEGS_MAX) {
+	if (xfer->segs > WA_SEGS_MAX) {
 		dev_err(dev, "BUG? ops, number of segments %d bigger than %d\n",
 			(int)(urb->transfer_buffer_length / xfer->seg_size),
 			WA_SEGS_MAX);


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