tree 22fa4732c8270db8fd3f681355cd83e4b8088847
parent eb51b65005737b777e0709683b061d5f82aefd97
author mochel@digitalimplant.org <mochel@digitalimplant.org> 1111430464 -0800
committer Greg Kroah-Hartman <gregkh@suse.de> 1119305712 -0700

[PATCH] Add a semaphore to struct device to synchronize calls to its driver.

This adds a per-device semaphore that is taken before every call from the core to a
driver method. This prevents e.g. simultaneous calls to the ->suspend() or ->resume()
and ->probe() or ->release(), potentially saving a whole lot of headaches.

It also moves us a step closer to removing the bus rwsem, since it protects the fields
in struct device that are modified by the core.

Signed-off-by: Patrick Mochel <mochel@digitalimplant.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>