linux-kernel - [PATCH] media: add dump_stack() if called in atomic context

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Message-Id: <1457829425-4411-1-git-send-email-shuahkh@osg.samsung.com>
Date:	Sat, 12 Mar 2016 17:37:05 -0700
From:	Shuah Khan <shuahkh@....samsung.com>
To:	mchehab@....samsung.com
Cc:	Shuah Khan <shuahkh@....samsung.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] media: add dump_stack() if called in atomic context

Change media_add_link() and media_devnode_create() to dump_stack when
called in atomic context.

Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
Suggested-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
---
 drivers/media/media-entity.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index e95070b..66a5392 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -570,6 +570,9 @@ static struct media_link *media_add_link(struct list_head *head)
 {
 	struct media_link *link;
 
+	if (in_atomic())
+		dump_stack();
+
 	link = kzalloc(sizeof(*link), GFP_KERNEL);
 	if (link == NULL)
 		return NULL;
@@ -891,6 +894,9 @@ struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
 {
 	struct media_intf_devnode *devnode;
 
+	if (in_atomic())
+		dump_stack();
+
 	devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
 	if (!devnode)
 		return NULL;
-- 
2.5.0