perf_counter: Fix ctx->mutex vs counter->mutex inversion

Simon triggered a lockdep inversion report about us taking ctx->mutex
vs counter->mutex in inverse orders. Fix that up.

Reported-by: Simon Holm Thøgersen <odie@cs.aau.dk>
Tested-by: Simon Holm Thøgersen <odie@cs.aau.dk>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 23 deletions

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index e914daff03b5..109a95723859 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1620,22 +1620,6 @@ static void perf_counter_reset(struct perf_counter *counter)
         perf_counter_update_userpage(counter);
 }
 
-static void perf_counter_for_each_sibling(struct perf_counter *counter,
-                                          void (*func)(struct perf_counter *))
-{
-        struct perf_counter_context *ctx = counter->ctx;
-        struct perf_counter *sibling;
-
-        WARN_ON_ONCE(ctx->parent_ctx);
-        mutex_lock(&ctx->mutex);
-        counter = counter->group_leader;
-
-        func(counter);
-        list_for_each_entry(sibling, &counter->sibling_list, list_entry)
-                func(sibling);
-        mutex_unlock(&ctx->mutex);
-}
-
 /*
  * Holding the top-level counter's child_mutex means that any
  * descendant process that has inherited this counter will block
@@ -1658,14 +1642,18 @@ static void perf_counter_for_each_child(struct perf_counter *counter,
 static void perf_counter_for_each(struct perf_counter *counter,
                                   void (*func)(struct perf_counter *))
 {
-        struct perf_counter *child;
+        struct perf_counter_context *ctx = counter->ctx;
+        struct perf_counter *sibling;
 
-        WARN_ON_ONCE(counter->ctx->parent_ctx);
-        mutex_lock(&counter->child_mutex);
-        perf_counter_for_each_sibling(counter, func);
-        list_for_each_entry(child, &counter->child_list, child_list)
-                perf_counter_for_each_sibling(child, func);
-        mutex_unlock(&counter->child_mutex);
+        WARN_ON_ONCE(ctx->parent_ctx);
+        mutex_lock(&ctx->mutex);
+        counter = counter->group_leader;
+
+        perf_counter_for_each_child(counter, func);
+        func(counter);
+        list_for_each_entry(sibling, &counter->sibling_list, list_entry)
+                perf_counter_for_each_child(counter, func);
+        mutex_unlock(&ctx->mutex);
 }
 
 static int perf_counter_period(struct perf_counter *counter, u64 __user *arg)