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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2015-05-07 14:26:34 -0700 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2015-05-12 14:13:20 +0200 |
| commit | 2d94e5224e81c58986a8cf44a3bf4830ce5cb96e (patch) | |
| tree | b12b410a0dc0fea939f8da807e8d83471bc1c111 | |
| parent | 5006c1052aafa01dab5b0e643b7dac755b41f3bb (diff) | |
| download | linux-2d94e5224e81c58986a8cf44a3bf4830ce5cb96e.tar.gz linux-2d94e5224e81c58986a8cf44a3bf4830ce5cb96e.tar.bz2 linux-2d94e5224e81c58986a8cf44a3bf4830ce5cb96e.zip | |
HID: hid-sensor-hub: Fix debug lock warning
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>
| -rw-r--r-- | drivers/hid/hid-sensor-hub.c | 13 | ||||
| -rw-r--r-- | include/linux/hid-sensor-hub.h | 4 |
2 files changed, 12 insertions, 5 deletions
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c index c3f6f1e311ea..090a1ba0abb6 100644 --- a/drivers/hid/hid-sensor-hub.c +++ b/drivers/hid/hid-sensor-hub.c @@ -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; diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h index 0408421d885f..0042bf330b99 100644 --- a/include/linux/hid-sensor-hub.h +++ b/include/linux/hid-sensor-hub.h @@ -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; }; |