Commit 6b55fc63 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

audit, sched/wait: Fixup kauditd_thread() wait loop

The kauditd_thread wait loop is a bit iffy; it has a number of problems:

 - calls try_to_freeze() before schedule(); you typically want the
   thread to re-evaluate the sleep condition when unfreezing, also
   freeze_task() issues a wakeup.

 - it unconditionally does the {add,remove}_wait_queue(), even when the
   sleep condition is false.

Use wait_event_freezable() that does the right thing.
Reported-by: default avatarMike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: oleg@redhat.com
Cc: Eric Paris <eparis@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20141002102251.GA6324@worktop.programming.kicks-ass.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 5d4d5658
...@@ -499,7 +499,6 @@ static int kauditd_thread(void *dummy) ...@@ -499,7 +499,6 @@ static int kauditd_thread(void *dummy)
set_freezable(); set_freezable();
while (!kthread_should_stop()) { while (!kthread_should_stop()) {
struct sk_buff *skb; struct sk_buff *skb;
DECLARE_WAITQUEUE(wait, current);
flush_hold_queue(); flush_hold_queue();
...@@ -514,16 +513,8 @@ static int kauditd_thread(void *dummy) ...@@ -514,16 +513,8 @@ static int kauditd_thread(void *dummy)
audit_printk_skb(skb); audit_printk_skb(skb);
continue; continue;
} }
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&kauditd_wait, &wait);
if (!skb_queue_len(&audit_skb_queue)) { wait_event_freezable(kauditd_wait, skb_queue_len(&audit_skb_queue));
try_to_freeze();
schedule();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&kauditd_wait, &wait);
} }
return 0; return 0;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment