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H A Dcuse.c30783587b0f318b9e2e165f34cf5dfd9425a4904 Sat Nov 17 11:45:48 UTC 2012 David Herrmann <dh.herrmann@googlemail.com> cuse: do not register multiple devices with identical names

Sysfs doesn't allow two devices with the same name, but we register a
sysfs entry for each cuse device without checking for name collisions.
This extends the registration to first check whether the name was already
registered.

To avoid race-conditions between the name-check and linking the device, we
need to protect the whole registration with a mutex.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>