sched, modules: Fix nested sleep in add_unformed_module()
authorPeter Zijlstra <peterz@infradead.org>
Wed, 24 Sep 2014 08:18:53 +0000 (10:18 +0200)
committerIngo Molnar <mingo@kernel.org>
Tue, 28 Oct 2014 09:56:30 +0000 (10:56 +0100)
commit3c9b2c3d64a49f264422d7743599cf7f6535972d
tree72e5230f01883c626c4d9415b7c53f9cbc9f6365
parent7d4d26966e0b6443c78123a8a8b602e8eaf67694
sched, modules: Fix nested sleep in add_unformed_module()

This is a genuine bug in add_unformed_module(), we cannot use blocking
primitives inside a wait loop.

So rewrite the wait_event_interruptible() usage to use the fresh
wait_woken() stuff.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: tglx@linutronix.de
Cc: ilya.dryomov@inktank.com
Cc: umgwanakikbuti@gmail.com
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: oleg@redhat.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: http://lkml.kernel.org/r/20140924082242.458562904@infradead.org
[ So this is probably complex to backport and the race wasn't reported AFAIK,
  so not marked for -stable. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/module.c