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stm class: Fix stm device initialization order

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[ Upstream commit 389b6699a2 ]

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@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Shishkin
2016-03-04 16:48:14 +02:00
committed by Greg Kroah-Hartman
parent 2040e80d80
commit b0351a51ff
1 changed files with 12 additions and 11 deletions
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23
drivers/hwtracing/stm/core.c
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@@ -664,6 +664,18 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
stm->dev.parent = parent;
stm->dev.release = stm_device_release;
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;
stm->owner = owner;
stm->data = stm_data;
stm_data->stm = stm;
err = kobject_set_name(&stm->dev.kobj, "%s", stm_data->name);
if (err)
goto err_device;
@@ -672,17 +684,6 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
if (err)
goto err_device;
mutex_init(&stm->link_mutex);
spin_lock_init(&stm->link_lock);
INIT_LIST_HEAD(&stm->link_list);
spin_lock_init(&stm->mc_lock);
mutex_init(&stm->policy_mutex);
stm->sw_nmasters = nmasters;
stm->owner = owner;
stm->data = stm_data;
stm_data->stm = stm;
return 0;
err_device: