From: Bjørn Mork <bjorn@mork.no>
Date: Fri, 20 Jan 2012 00:49:57 +0000 (+0100)
Subject: USB: cdc-wdm: Avoid hanging on interface with no USB_CDC_DMM_TYPE
X-Git-Tag: v3.3-rc2~5^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15699e6fafc3a90e5fdc2ef30555a04dee62286f;p=pandora-kernel.git

USB: cdc-wdm: Avoid hanging on interface with no USB_CDC_DMM_TYPE

The probe does not strictly require the USB_CDC_DMM_TYPE
descriptor, which is a good thing as it makes the driver
usable on non-conforming interfaces.  A user could e.g.
bind to it to a CDC ECM interface by using the new_id and
bind sysfs files.  But this would fail with a 0 buffer length
due to the missing descriptor.

Fix by defining a reasonable fallback size: The minimum
device receive buffer size required by the CDC WMC standard,
revision 1.1

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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