From 477ad1921c0413be13f94be7ed68ef787619b391 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <jic23@kernel.org>
Date: Wed, 15 Feb 2012 19:48:00 +0000
Subject: [PATCH] --- yaml --- r: 289142 b: refs/heads/master c:
 ac917a81117ce0286847666b55dd265f6cda8383 h: refs/heads/master v: v3

---
 [refs]                                        | 2 +-
 trunk/drivers/staging/iio/iio.h               | 2 ++
 trunk/drivers/staging/iio/industrialio-core.c | 4 ++++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 293735fba992..41125a7ac0e8 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 08cd9ef4eca0b53cdae190b718e4945408c7d3b8
+refs/heads/master: ac917a81117ce0286847666b55dd265f6cda8383
diff --git a/trunk/drivers/staging/iio/iio.h b/trunk/drivers/staging/iio/iio.h
index be6ced31f65e..478dbe5924cb 100644
--- a/trunk/drivers/staging/iio/iio.h
+++ b/trunk/drivers/staging/iio/iio.h
@@ -310,6 +310,7 @@ struct iio_buffer_setup_ops {
  * @chan_attr_group:	[INTERN] group for all attrs in base directory
  * @name:		[DRIVER] name of the device.
  * @info:		[DRIVER] callbacks and constant info from driver
+ * @info_exist_lock:	[INTERN] lock to prevent use during removal
  * @chrdev:		[INTERN] associated character device
  * @groups:		[INTERN] attribute groups
  * @groupcounter:	[INTERN] index of next attribute group
@@ -340,6 +341,7 @@ struct iio_dev {
 	struct attribute_group		chan_attr_group;
 	const char			*name;
 	const struct iio_info		*info;
+	struct mutex			info_exist_lock;
 	const struct iio_buffer_setup_ops	*setup_ops;
 	struct cdev			chrdev;
 #define IIO_MAX_GROUPS 6
diff --git a/trunk/drivers/staging/iio/industrialio-core.c b/trunk/drivers/staging/iio/industrialio-core.c
index e4824fe8b405..3a2d08026624 100644
--- a/trunk/drivers/staging/iio/industrialio-core.c
+++ b/trunk/drivers/staging/iio/industrialio-core.c
@@ -594,6 +594,7 @@ struct iio_dev *iio_allocate_device(int sizeof_priv)
 		device_initialize(&dev->dev);
 		dev_set_drvdata(&dev->dev, (void *)dev);
 		mutex_init(&dev->mlock);
+		mutex_init(&dev->info_exist_lock);
 
 		dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
 		if (dev->id < 0) {
@@ -718,6 +719,9 @@ EXPORT_SYMBOL(iio_device_register);
 
 void iio_device_unregister(struct iio_dev *indio_dev)
 {
+	mutex_lock(&indio_dev->info_exist_lock);
+	indio_dev->info = NULL;
+	mutex_unlock(&indio_dev->info_exist_lock);
 	device_unregister(&indio_dev->dev);
 }
 EXPORT_SYMBOL(iio_device_unregister);