linux-kernel - [QUEUED v20160420 07/19] stm class: Fix stm device initialization order

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Date:	Wed, 20 Apr 2016 13:43:20 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Greg KH <greg@...ah.com>
Cc:	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Chunyan Zhang <zhang.chunyan@...aro.org>,
	laurent.fert@...el.com, yann.fouassier@...el.com,
	linux-kernel@...r.kernel.org,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [QUEUED v20160420 07/19] stm class: Fix stm device initialization order

Currently, stm_register_device() makes the device visible and then
proceeds to initializing spinlocks and other properties, which leaves
a window when the device can already be opened but is not yet fully
operational.

Fix this by reversing the initialization order.

Reported-by: Alan Cox <alan.cox@...el.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@...el.com>
---
 drivers/hwtracing/stm/core.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index e55ed67142..2591442e2c 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -666,18 +666,11 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
 	stm->dev.parent = parent;
 	stm->dev.release = stm_device_release;
 
-	err = kobject_set_name(&stm->dev.kobj, "%s", stm_data->name);
-	if (err)
-		goto err_device;
-
-	err = device_add(&stm->dev);
-	if (err)
-		goto err_device;
-
 	mutex_init(&stm->link_mutex);
 	spin_lock_init(&stm->link_lock);
 	INIT_LIST_HEAD(&stm->link_list);
 
+	/* initialize the object before it is accessible via sysfs */
 	spin_lock_init(&stm->mc_lock);
 	mutex_init(&stm->policy_mutex);
 	stm->sw_nmasters = nmasters;
@@ -685,6 +678,14 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
 	stm->data = stm_data;
 	stm_data->stm = stm;
 
+	err = kobject_set_name(&stm->dev.kobj, "%s", stm_data->name);
+	if (err)
+		goto err_device;
+
+	err = device_add(&stm->dev);
+	if (err)
+		goto err_device;
+
 	return 0;
 
 err_device:
-- 
2.8.0.rc3