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HID: hid-sensor-hub: Fix debug lock warning

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When CONFIG_DEBUG_LOCK_ALLOC is defined, mutex magic is compared and
warned for (l->magic != l), here l is the address of mutex pointer.
In hid-sensor-hub as part of hsdev creation, a per hsdev mutex is
initialized during MFD cell creation. This hsdev, which contains, mutex
is part of platform data for the a cell. But platform_data is copied
in platform_device_add_data() in platform.c. This copy will copy the
whole hsdev structure including mutex. But once copied the magic
will no longer match. So when client driver call
sensor_hub_input_attr_get_raw_value, this will trigger mutex warning.
So to avoid this allocate mutex dynamically. This will be same even
after copy.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Srinivas Pandruvada 2015-05-07 14:26:34 -07:00 committed by Jiri Kosina
parent 5006c1052a
commit 2d94e5224e
2 changed files with 12 additions and 5 deletions
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13
drivers/hid/hid-sensor-hub.c
View file

@ -294,7 +294,7 @@ int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
if (!report)
return -EINVAL;
mutex_lock(&hsdev->mutex);
mutex_lock(hsdev->mutex_ptr);
if (flag == SENSOR_HUB_SYNC) {
memset(&hsdev->pending, 0, sizeof(hsdev->pending));
init_completion(&hsdev->pending.ready);
@ -328,7 +328,7 @@ int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
kfree(hsdev->pending.raw_data);
hsdev->pending.status = false;
}
mutex_unlock(&hsdev->mutex);
mutex_unlock(hsdev->mutex_ptr);
return ret_val;
}
@ -667,7 +667,14 @@ static int sensor_hub_probe(struct hid_device *hdev,
hsdev->vendor_id = hdev->vendor;
hsdev->product_id = hdev->product;
hsdev->usage = collection->usage;
mutex_init(&hsdev->mutex);
hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
sizeof(struct mutex),
GFP_KERNEL);
if (!hsdev->mutex_ptr) {
ret = -ENOMEM;
goto err_stop_hw;
}
mutex_init(hsdev->mutex_ptr);
hsdev->start_collection_index = i;
if (last_hsdev)
last_hsdev->end_collection_index = i;

4
include/linux/hid-sensor-hub.h
View file

@ -74,7 +74,7 @@ struct sensor_hub_pending {
* @usage: Usage id for this hub device instance.
* @start_collection_index: Starting index for a phy type collection
* @end_collection_index: Last index for a phy type collection
* @mutex: synchronizing mutex.
* @mutex_ptr: synchronizing mutex pointer.
* @pending: Holds information of pending sync read request.
*/
struct hid_sensor_hub_device {
@ -84,7 +84,7 @@ struct hid_sensor_hub_device {
u32 usage;
int start_collection_index;
int end_collection_index;
struct mutex mutex;
struct mutex *mutex_ptr;
struct sensor_hub_pending pending;
};