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authorSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>2011-12-07 02:24:38 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2011-12-09 02:22:21 +0400
commit9b6fc5dc879bc90f765db0e95eefcf123d0d06dd (patch)
tree1ccae80c48070963c2296a6e4c6d98107a0efbbf /kernel/power/user.c
parent33e638b9070ba5e8812836e20390da6a6af13900 (diff)
downloadlinux-9b6fc5dc879bc90f765db0e95eefcf123d0d06dd.tar.xz
PM / Sleep: Make [un]lock_system_sleep() generic
The [un]lock_system_sleep() APIs were originally introduced to mutually exclude memory hotplug and hibernation. Directly using mutex_lock(&pm_mutex) to achieve mutual exclusion with suspend or hibernation code can lead to freezing failures. However, the APIs [un]lock_system_sleep() can be safely used to achieve the same, without causing freezing failures. So, since it would be beneficial to modify all the existing users of mutex_lock(&pm_mutex) (in all parts of the kernel), so that they use these safe APIs intead, make these APIs generic by removing the restriction that they work only when CONFIG_HIBERNATE_CALLBACKS is set. Moreover, that restriction didn't buy us anything anyway. Suggested-by: Tejun Heo <tj@kernel.org> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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