- percpu_counter-fix-cpu-unplug-race-in-percpu_counter_destroy.patch removed from -mm tree

[akpm@linux-foundation.org]

The patch titled
     percpu_counter: fix CPU unplug race in percpu_counter_destroy()
has been removed from the -mm tree.  Its filename was
     percpu_counter-fix-cpu-unplug-race-in-percpu_counter_destroy.patch

This patch was dropped because it was merged into mainline or a subsystem tree

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: percpu_counter: fix CPU unplug race in percpu_counter_destroy()
From: Eric Dumazet <dada1@cosmosbay.com>

We should first delete the counter from percpu_counters list
before freeing memory, or a percpu_counter_hotcpu_callback()
could dereference a NULL pointer.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/percpu_counter.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN lib/percpu_counter.c~percpu_counter-fix-cpu-unplug-race-in-percpu_counter_destroy lib/percpu_counter.c
--- a/lib/percpu_counter.c~percpu_counter-fix-cpu-unplug-race-in-percpu_counter_destroy
+++ a/lib/percpu_counter.c
@@ -104,13 +104,13 @@ void percpu_counter_destroy(struct percp
 	if (!fbc->counters)
 		return;
 
-	free_percpu(fbc->counters);
-	fbc->counters = NULL;
 #ifdef CONFIG_HOTPLUG_CPU
 	mutex_lock(&percpu_counters_lock);
 	list_del(&fbc->list);
 	mutex_unlock(&percpu_counters_lock);
 #endif
+	free_percpu(fbc->counters);
+	fbc->counters = NULL;
 }
 EXPORT_SYMBOL(percpu_counter_destroy);
 
_

Patches currently in -mm which might be from dada1@cosmosbay.com are

origin.patch
linux-next.patch
percpu_counter-fbc_batch-should-be-a-variable.patch
softirq-introduce-statistics-for-softirq.patch
proc-export-statistics-for-softirq-to-proc.patch
proc-update-document-for-proc-softirqs-and-proc-stat.patch