linux-kernel - [PATCH] locktorture: fix wrong parameter handling

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Date:	Fri,  9 Oct 2015 14:14:45 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH] locktorture: fix wrong parameter handling

Calling locktorture with a wrong parameter makes it
unusable:

$ modprobe locktorture torture_type=help
modprobe: ERROR: could not insert 'locktorture': Invalid argument

$ modprobe locktorture torture_type=spin_lock
modprobe: ERROR: could not insert 'locktorture': Device or resource busy

$ dmesg
[...]
torture_init_begin: refusing spin_lock init: help running

We can easily do the checking before call into the torture framework.

Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
---
 kernel/locking/locktorture.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 3224418..f5f66a6 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -645,9 +645,6 @@ static int __init lock_torture_init(void)
 		&rwsem_lock_ops,
 	};
 
-	if (!torture_init_begin(torture_type, verbose, &torture_runnable))
-		return -EBUSY;
-
 	/* Process args and tell the world that the torturer is on the job. */
 	for (i = 0; i < ARRAY_SIZE(torture_ops); i++) {
 		cxt.cur_ops = torture_ops[i];
@@ -661,9 +658,12 @@ static int __init lock_torture_init(void)
 		for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
 			pr_alert(" %s", torture_ops[i]->name);
 		pr_alert("\n");
-		torture_init_end();
 		return -EINVAL;
 	}
+
+	if (!torture_init_begin(torture_type, verbose, &torture_runnable))
+		return -EBUSY;
+
 	if (cxt.cur_ops->init)
 		cxt.cur_ops->init(); /* no "goto unwind" prior to this point!!! */
 
-- 
2.4.3

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