* [PATCH] HID: hid-sensor-hub: Fix lockdep warning for dynamic callback locks.
@ 2014-05-14 1:03 Reyad Attiyat
2014-05-14 1:49 ` Reyad Attiyat
0 siblings, 1 reply; 3+ messages in thread
From: Reyad Attiyat @ 2014-05-14 1:03 UTC (permalink / raw)
To: linux-kernel, linux-input, linux-iio, Srinivas Pandruvada
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.
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] HID: hid-sensor-hub: Fix lockdep warning for dynamic callback locks.
2014-05-14 1:03 [PATCH] HID: hid-sensor-hub: Fix lockdep warning for dynamic callback locks Reyad Attiyat
@ 2014-05-14 1:49 ` Reyad Attiyat
2014-05-24 10:32 ` Jonathan Cameron
0 siblings, 1 reply; 3+ messages in thread
From: Reyad Attiyat @ 2014-05-14 1:49 UTC (permalink / raw)
To: linux-kernel, linux-input, linux-iio, Srinivas Pandruvada
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@gmail.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.
> ---
> 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
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] HID: hid-sensor-hub: Fix lockdep warning for dynamic callback locks.
2014-05-14 1:49 ` Reyad Attiyat
@ 2014-05-24 10:32 ` Jonathan Cameron
0 siblings, 0 replies; 3+ messages in thread
From: Jonathan Cameron @ 2014-05-24 10:32 UTC (permalink / raw)
To: Reyad Attiyat, linux-kernel, linux-input, linux-iio,
Srinivas Pandruvada, Jiri Kosina
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@gmail.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@kernel.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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^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-05-24 10:30 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2014-05-14 1:03 [PATCH] HID: hid-sensor-hub: Fix lockdep warning for dynamic callback locks Reyad Attiyat
2014-05-14 1:49 ` Reyad Attiyat
2014-05-24 10:32 ` Jonathan Cameron
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