USB: accept some invalid ep0-maxpacket values

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@rowland.harvard.edu>
Reported-by: James <bjlockie@lockie.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 9cc0abae79231d30869d57f23dbb659208e1ad20..53b14feaa684defbebff70027ab0cfbb3d465819 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2872,13 +2872,16 @@ 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);
        }