Allow linker_search_symbol_name() to be called with KLD lock held.

The linker_search_symbol_name() function is used by stack_print()
and stack_print() can be called from kernel module unload method.

MFC after:	1 week

1 files changed, 6 insertions, 3 deletions

diff --git a/sys/kern/kern_linker.c b/sys/kern/kern_linker.c
index 45d7653..c417366 100644
--- a/sys/kern/kern_linker.c
+++ b/sys/kern/kern_linker.c
@@ -924,11 +924,14 @@ int
 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
     long *offset)
 {
-	int error;
+	int error, locked;
 
-	KLD_LOCK();
+	locked = KLD_LOCKED();
+	if (!locked)
+		KLD_LOCK();
 	error = linker_debug_search_symbol_name(value, buf, buflen, offset);
-	KLD_UNLOCK();
+	if (!locked)
+		KLD_UNLOCK();
 	return (error);
 }