]> git.karo-electronics.de Git - karo-tx-linux.git/commit
staging: android/lowmemorykiller: Don't unregister notifier from atomic context
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Wed, 7 Mar 2012 13:54:00 +0000 (17:54 +0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 7 Mar 2012 21:18:51 +0000 (13:18 -0800)
commit1eda5166c7640092f512138be6899d050c3d62ed
tree9f7dd780afc5cdab0dc86524fa037650c0e80c46
parent2c52325ed2984069f893040f6139f0024e7d3b50
staging: android/lowmemorykiller: Don't unregister notifier from atomic context

The lowmemorykiller registers an atomic notifier for notfication of when
the task is freed.  From this atomic notifier callback, it removes the
atomic notifier via task_free_unregister().  This is incorrect because
atomic_notifier_chain_unregister() calls syncronize_rcu(), which can
sleep, which shouldn't be done from an atomic notifier.

Fix this by registering the notifier during init, and only unregister it
if the lowmemorykiller is unloaded.

Rebased to -next by Paul E. McKenney.
Rebased to -next again by Anton Vorontsov.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Christian Bejram <christian.bejram@stericsson.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/android/lowmemorykiller.c