tree 7933ca5e141fea2f5fe7595e5e1cc4580bb68488
parent e16362a0c8d90e9adbfe477acbe32b021823fb22
author Alan Stern <stern@rowland.harvard.edu> 1211316042 -0400
committer Greg Kroah-Hartman <gregkh@suse.de> 1212094743 -0700

USB: add all configs to the "descriptors" attribute

This patch (as1094) changes the output of the "descriptors" binary
attribute.  Now it will contain the device descriptor followed by all
the configuration descriptors, not just the descriptor for the current
config.

Userspace libraries want to have access to the kernel's cached
descriptor information, so they can learn about device characteristics
without having to wake up suspended devices.  So far the only user of
this attribute is the new libusb-1.0 library; thus changing its
contents shouldn't cause any problems.

This should be considered for 2.6.26, if for no other reason than to
minimize the range of releases in which the attribute contains only the
current config descriptor.

Also, it doesn't hurt that the patch removes the device locking --
which was formerly needed in order to know for certain which config was
indeed current.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>