s390/test_unwind: unify error handling paths

Handle the case of "unwind state reliable but addr is 0" like other error
cases in this function and trigger output of failing stacktrace to aid
debugging.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/lib/test_unwind.c b/arch/s390/lib/test_unwind.c
index dcd8946255bebec680f9dc20d75f71fdf75fe4a4..54b36e71ddf304f1f36d94bc6907a96c9e3b8f0d 100644 (file)
--- a/arch/s390/lib/test_unwind.c
+++ b/arch/s390/lib/test_unwind.c
@@ -64,8 +64,8 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
                        break;
                if (state.reliable && !addr) {
                        pr_err("unwind state reliable but addr is 0\n");
-                       kfree(bt);
-                       return -EINVAL;
+                       ret = -EINVAL;
+                       break;
                }
                sprint_symbol(sym, addr);
                if (bt_pos < BT_BUF_SIZE) {