linux-kernel - [PATCH -mm] return error on create_comp

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Date:	Mon, 25 Dec 2006 17:13:47 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>, akpm@...l.org
Subject: [PATCH -mm] return error on create_comp_task() failure

On Thu, Dec 21, 2006 at 10:22:02PM +0100, Heiko Carstens wrote:
> > @@ -730,7 +732,7 @@ int ehca_create_comp_pool(void)
> > 
> >  	for_each_online_cpu(cpu) {
> >  		task = create_comp_task(pool, cpu);
> > -		if (task) {
> > +		if (!IS_ERR(task)) {
> >  			kthread_bind(task, cpu);
> >  			wake_up_process(task);
> >  		}
> 
> So you silently ignore errors and the module loads anyway?

Subject: [PATCH -mm] return error on create_comp_task() failure

This patch frees allocated data and returns error
to avoid module loading if create_comp_task() failed.

Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Hoang-Nam Nguyen <hnguyen@...ibm.com>
Cc: Christoph Raisch <raisch@...ibm.com>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>

---
 drivers/infiniband/hw/ehca/ehca_irq.c |   37 ++++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 8 deletions(-)

Index: 2.6-mm/drivers/infiniband/hw/ehca/ehca_irq.c
===================================================================
--- 2.6-mm.orig/drivers/infiniband/hw/ehca/ehca_irq.c
+++ 2.6-mm/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -716,11 +716,12 @@ static int comp_pool_callback(struct not
 
 #endif
 
+#ifdef CONFIG_INFINIBAND_EHCA_SCALING
+
 int ehca_create_comp_pool(void)
 {
-#ifdef CONFIG_INFINIBAND_EHCA_SCALING
 	int cpu;
-	struct task_struct *task;
+	int err;
 
 	pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
 	if (pool == NULL)
@@ -736,21 +737,41 @@ int ehca_create_comp_pool(void)
 	}
 
 	for_each_online_cpu(cpu) {
-		task = create_comp_task(pool, cpu);
-		if (!IS_ERR(task)) {
-			kthread_bind(task, cpu);
-			wake_up_process(task);
+		struct task_struct *task = create_comp_task(pool, cpu);
+
+		if (IS_ERR(task)) {
+			err = PTR_ERR(task);
+			goto err_comp_task;
 		}
+		kthread_bind(task, cpu);
+		wake_up_process(task);
 	}
 
 	comp_pool_callback_nb.notifier_call = comp_pool_callback;
-	comp_pool_callback_nb.priority =0;
+	comp_pool_callback_nb.priority = 0;
 	register_cpu_notifier(&comp_pool_callback_nb);
-#endif
 
 	return 0;
+
+err_comp_task:
+	for_each_online_cpu(cpu)
+		destroy_comp_task(pool, cpu);
+
+	free_percpu(pool->cpu_comp_tasks);
+	kfree(pool);
+
+	return err;
+}
+
+#else
+
+int ehca_create_comp_pool(void)
+{
+	return 0;
 }
 
+#endif
+
 void ehca_destroy_comp_pool(void)
 {
 #ifdef CONFIG_INFINIBAND_EHCA_SCALING
-
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