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Date: Sat, 24 May 2014 11:32:04 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Reyad Attiyat <reyad.attiyat@...il.com>,
linux-kernel@...r.kernel.org,
linux-input <linux-input@...r.kernel.org>,
linux-iio@...r.kernel.org,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH] HID: hid-sensor-hub: Fix lockdep warning for dynamic
callback locks.
On 14/05/14 02:49, Reyad Attiyat wrote:
> Here is a sample of the kernel lockdep warning I got after turingon
> dynamic debugging:
> https://bugzilla.kernel.org/show_bug.cgi?id=73321#c3
>
>
>
> On Tue, May 13, 2014 at 8:03 PM, Reyad Attiyat <reyad.attiyat@...il.com> wrote:
>> Changes all dyn_callback_lock spinlocks to spinlocks that disable
>> interrupts. The dynamic callback lock (dyn_callback_lock) must not be
>> interrupted when locked as it is used in an interrupt handler
>> function, sensor_hub_raw_event.
Looks sane to me, but no sign off and Jiri not cc'd.
Would like an ack from Srinivas as well ideally.
Acked-by: Jonathan Cameron <jic23@...nel.org>
>> ---
>> drivers/hid/hid-sensor-hub.c | 31 ++++++++++++++++++-------------
>> 1 file changed, 18 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
>> index af8244b..1e1644c 100644
>> --- a/drivers/hid/hid-sensor-hub.c
>> +++ b/drivers/hid/hid-sensor-hub.c
>> @@ -133,10 +133,11 @@ static struct hid_sensor_hub_callbacks
>> *sensor_hub_get_callback(
>> struct hid_sensor_hub_device **hsdev,
>> void **priv)
>> {
>> + unsigned long flags;
>> struct hid_sensor_hub_callbacks_list *callback;
>> struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
>>
>> - spin_lock(&pdata->dyn_callback_lock);
>> + spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
>> list_for_each_entry(callback, &pdata->dyn_callback_list, list)
>> if (callback->usage_id == usage_id &&
>> (collection_index >=
>> @@ -145,10 +146,10 @@ static struct hid_sensor_hub_callbacks
>> *sensor_hub_get_callback(
>> callback->hsdev->end_collection_index)) {
>> *priv = callback->priv;
>> *hsdev = callback->hsdev;
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>> return callback->usage_callback;
>> }
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>>
>> return NULL;
>> }
>> @@ -157,19 +158,20 @@ int sensor_hub_register_callback(struct
>> hid_sensor_hub_device *hsdev,
>> u32 usage_id,
>> struct hid_sensor_hub_callbacks *usage_callback)
>> {
>> + unsigned long flags;
>> struct hid_sensor_hub_callbacks_list *callback;
>> struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
>>
>> - spin_lock(&pdata->dyn_callback_lock);
>> + spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
>> list_for_each_entry(callback, &pdata->dyn_callback_list, list)
>> if (callback->usage_id == usage_id &&
>> callback->hsdev == hsdev) {
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>> return -EINVAL;
>> }
>> callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
>> if (!callback) {
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>> return -ENOMEM;
>> }
>> callback->hsdev = hsdev;
>> @@ -177,7 +179,7 @@ int sensor_hub_register_callback(struct
>> hid_sensor_hub_device *hsdev,
>> callback->usage_id = usage_id;
>> callback->priv = NULL;
>> list_add_tail(&callback->list, &pdata->dyn_callback_list);
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>>
>> return 0;
>> }
>> @@ -186,10 +188,11 @@ EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
>> int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
>> u32 usage_id)
>> {
>> + unsigned long flags;
>> struct hid_sensor_hub_callbacks_list *callback;
>> struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
>>
>> - spin_lock(&pdata->dyn_callback_lock);
>> + spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
>> list_for_each_entry(callback, &pdata->dyn_callback_list, list)
>> if (callback->usage_id == usage_id &&
>> callback->hsdev == hsdev) {
>> @@ -197,7 +200,7 @@ int sensor_hub_remove_callback(struct
>> hid_sensor_hub_device *hsdev,
>> kfree(callback);
>> break;
>> }
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>>
>> return 0;
>> }
>> @@ -376,34 +379,36 @@ EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
>> #ifdef CONFIG_PM
>> static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
>> {
>> + unsigned long flags;
>> struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
>> struct hid_sensor_hub_callbacks_list *callback;
>>
>> hid_dbg(hdev, " sensor_hub_suspend\n");
>> - spin_lock(&pdata->dyn_callback_lock);
>> + spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
>> list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
>> if (callback->usage_callback->suspend)
>> callback->usage_callback->suspend(
>> callback->hsdev, callback->priv);
>> }
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>>
>> return 0;
>> }
>>
>> static int sensor_hub_resume(struct hid_device *hdev)
>> {
>> + unsigned long flags;
>> struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
>> struct hid_sensor_hub_callbacks_list *callback;
>>
>> hid_dbg(hdev, " sensor_hub_resume\n");
>> - spin_lock(&pdata->dyn_callback_lock);
>> + spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
>> list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
>> if (callback->usage_callback->resume)
>> callback->usage_callback->resume(
>> callback->hsdev, callback->priv);
>> }
>> - spin_unlock(&pdata->dyn_callback_lock);
>> + spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
>>
>> return 0;
>> }
>> --
>> 1.9.0
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