[PATCH] perf tools: Fix lockup using 32-bit compat vdso

[Adrian Hunter <adrian.hunter@intel.com>]

__machine__findnew_compat() is called only from
__machine__findnew_vdso_compat() which is called
only from machine__findnew_vdso() which already
holds machine->dsos.lock, so remove locking from
__machine__findnew_compat().

This manifests itself tracing 32-bit programs
with a 64-bit perf.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/vdso.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index 4b89118f158d..44d440da15dc 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -236,18 +236,16 @@ static struct dso *__machine__findnew_compat(struct machine *machine,
 	const char *file_name;
 	struct dso *dso;
 
-	pthread_rwlock_wrlock(&machine->dsos.lock);
 	dso = __dsos__find(&machine->dsos, vdso_file->dso_name, true);
 	if (dso)
-		goto out_unlock;
+		goto out;
 
 	file_name = vdso__get_compat_file(vdso_file);
 	if (!file_name)
-		goto out_unlock;
+		goto out;
 
 	dso = __machine__addnew_vdso(machine, vdso_file->dso_name, file_name);
-out_unlock:
-	pthread_rwlock_unlock(&machine->dsos.lock);
+out:
 	return dso;
 }
 
-- 
1.9.1