linux-kernel - [PATCH v2] usb: gadget: zero: Fix SuperSpeed enumeration for alternate setting 1

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Date:	Wed, 26 Mar 2014 18:46:38 +0200
From:	Roger Quadros <rogerq@...com>
To:	<balbi@...com>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<bigeasy@...utronix.de>, <sergei.shtylyov@...entembedded.com>,
	Roger Quadros <rogerq@...com>, "3.9+" <stable@...r.kernel.org>
Subject: [PATCH v2] usb: gadget: zero: Fix SuperSpeed enumeration for alternate setting 1

It was impossible to enumerate on a SuperSpeed (XHCI) host
with alternate setting = 1 due to the wrongly set 'bMaxBurst'
field in the SuperSpeed Endpoint Companion descriptor.

Testcase:
<host> modprobe -r usbtest; modprobe usbtest alt=1
<device> modprobe g_zero
plug device to SuperSpeed port on the host.

Without this patch the host always complains like so
"usb 12-2: Not enough bandwidth for new device state.
 usb 12-2: Not enough bandwidth for altsetting 1"

Bug was introduced by commit cf9a08ae in v3.9

Fixes: cf9a08ae5aec (usb: gadget: convert source sink and loopback to
new function interface)

Cc: 3.9+ <stable@...r.kernel.org> # 3.9+
Reviewed-by: Felipe Balbi <balbi@...com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/gadget/zero.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index 9f170c5..134f354 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -300,7 +300,7 @@ static int __init zero_bind(struct usb_composite_dev *cdev)
 	ss_opts->isoc_interval = gzero_options.isoc_interval;
 	ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
 	ss_opts->isoc_mult = gzero_options.isoc_mult;
-	ss_opts->isoc_maxburst = gzero_options.isoc_maxpacket;
+	ss_opts->isoc_maxburst = gzero_options.isoc_maxburst;
 	ss_opts->bulk_buflen = gzero_options.bulk_buflen;
 
 	func_ss = usb_get_function(func_inst_ss);
-- 
1.8.3.2

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