linux-kernel - [PATCH 4.7 067/184] iio: sw-trigger: Fix config group initialization

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Message-Id: <20160922174051.596811527@linuxfoundation.org>
Date:   Thu, 22 Sep 2016 19:40:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Daniel Baluta <daniel.baluta@...el.com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 4.7 067/184] iio: sw-trigger: Fix config group initialization

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lars-Peter Clausen <lars@...afoo.de>

commit b2f0c09664b72b2f8c581383a9337ac3092e42c8 upstream.

Use the IS_ENABLED() helper macro to ensure that the configfs group is
initialized either when configfs is built-in or when configfs is built as a
module. Otherwise software trigger creation will result in undefined
behaviour when configfs is built as a mdoule since the configfs group for
the trigger is not properly initialized.

Fixes: b662f809d410 ("iio: core: Introduce IIO software triggers")
Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Acked-by: Daniel Baluta <daniel.baluta@...el.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/iio/sw_trigger.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/iio/sw_trigger.h
+++ b/include/linux/iio/sw_trigger.h
@@ -62,7 +62,7 @@ void iio_swt_group_init_type_name(struct
 				  const char *name,
 				  struct config_item_type *type)
 {
-#ifdef CONFIG_CONFIGFS_FS
+#if IS_ENABLED(CONFIG_CONFIGFS_FS)
 	config_group_init_type_name(&t->group, name, type);
 #endif
 }