linux-kernel - [34-longterm 254/260] USB: accept some invalid ep0-maxpacket values

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Message-Id: <1293952756-15010-255-git-send-email-paul.gortmaker@windriver.com>
Date:	Sun,  2 Jan 2011 02:19:10 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 254/260] USB: accept some invalid ep0-maxpacket values

From: Alan Stern <stern@...land.harvard.edu>

commit 56626a72a47bf3e50875d960d6b5f17b9bee0ab2 upstream.

A few devices (such as the RCA VR5220 voice recorder) are so
non-compliant with the USB spec that they have invalid maxpacket sizes
for endpoint 0.  Nevertheless, as long as we can safely use them, we
may as well do so.

This patch (as1432) softens our acceptance criterion by allowing
high-speed devices to have ep0-maxpacket sizes other than 64.  A
warning is printed in the system log when this happens, and the
existing error message is clarified.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Reported-by: James <bjlockie@...kie.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/usb/core/hub.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 3e28f92..5b63c45 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2848,13 +2848,16 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 	else
 		i = udev->descriptor.bMaxPacketSize0;
 	if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
-		if (udev->speed != USB_SPEED_FULL ||
+		if (udev->speed == USB_SPEED_LOW ||
 				!(i == 8 || i == 16 || i == 32 || i == 64)) {
-			dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
+			dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
 			retval = -EMSGSIZE;
 			goto fail;
 		}
-		dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
+		if (udev->speed == USB_SPEED_FULL)
+			dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
+		else
+			dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
 		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
 		usb_ep0_reinit(udev);
 	}
-- 
1.7.3.3

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