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HID: sensor-hub: make dyn_callback_lock IRQ-safe 

dyn_callback_lock is being taken from IRQ context through hid_irq_in() ->
hid_input_report() -> sensor_hub_raw_event() -> sensor_hub_get_callback(),
therefore anyone else acquiring it needs to disable IRQs to disable deadlocks.

Reported-by: Alexander Holler <holler@ahsoftware.de>
Tested-by: Alexander Holler <holler@ahsoftware.de>
Reported-by: Reyad Attiyat <reyad.attiyat@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
Jiri Kosina 2014-06-10 11:05:43 +02:00
parent d6b92c2c37
commit 0ccf091d1f
1 changed files with 14 additions and 10 deletions
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24
drivers/hid/hid-sensor-hub.c
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@ -159,17 +159,18 @@ int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
{
struct hid_sensor_hub_callbacks_list *callback;
struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
unsigned long flags;
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 +178,7 @@ 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;
}
@ -188,8 +189,9 @@ int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
{
struct hid_sensor_hub_callbacks_list *callback;
struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
unsigned long flags;
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 +199,7 @@ 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;
}
@ -378,15 +380,16 @@ static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
{
struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
struct hid_sensor_hub_callbacks_list *callback;
unsigned long flags;
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;
}
@ -395,15 +398,16 @@ static int sensor_hub_resume(struct hid_device *hdev)
{
struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
struct hid_sensor_hub_callbacks_list *callback;
unsigned long flags;
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;
}