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Commit 18d8d4d2 authored by Sean Paul's avatar Sean Paul
Browse files

drm/rockchip: Convert psr_list_mutex to spinlock and use it 



This patch converts the psr_list_mutex to a spinlock and locks
all access to psr_list to avoid races (however unlikely they
were).

Reviewed-by: default avatarYakir Yang <ykk@rock-chips.com>
Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
parent 8f0ac5c4

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

+1 −1
Original line number Diff line number Diff line
@@ -157,7 +157,7 @@ static int rockchip_drm_bind(struct device *dev) 
	drm_dev->dev_private = private;



	INIT_LIST_HEAD(&private->psr_list);

	mutex_init(&private->psr_list_mutex);

	spin_lock_init(&private->psr_list_lock);



	drm_mode_config_init(drm_dev);

drivers/gpu/drm/rockchip/rockchip_drm_drv.h

+1 −1
Original line number Diff line number Diff line
@@ -63,7 +63,7 @@ struct rockchip_drm_private { 
	struct drm_atomic_state *state;



	struct list_head psr_list;

	struct mutex psr_list_mutex;

	spinlock_t psr_list_lock;

};



int rockchip_register_crtc_funcs(struct drm_crtc *crtc,

drivers/gpu/drm/rockchip/rockchip_drm_psr.c

+18 −7
Original line number Diff line number Diff line
@@ -45,12 +45,18 @@ static struct psr_drv *find_psr_by_crtc(struct drm_crtc *crtc) 
{

	struct rockchip_drm_private *drm_drv = crtc->dev->dev_private;

	struct psr_drv *psr;

	unsigned long flags;



	list_for_each_entry(psr, &drm_drv->psr_list, list)

	spin_lock_irqsave(&drm_drv->psr_list_lock, flags);

	list_for_each_entry(psr, &drm_drv->psr_list, list) {

		if (psr->encoder->crtc == crtc)

			return psr;

			goto out;

	}

	psr = ERR_PTR(-ENODEV);



	return ERR_PTR(-ENODEV);

out:

	spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);

	return psr;

}



static void psr_state_work(struct work_struct *work)
@@ -173,7 +179,9 @@ void rockchip_drm_psr_flush(struct drm_device *dev) 
{

	struct rockchip_drm_private *drm_drv = dev->dev_private;

	struct psr_drv *psr;

	unsigned long flags;



	spin_lock_irqsave(&drm_drv->psr_list_lock, flags);

	list_for_each_entry(psr, &drm_drv->psr_list, list) {

		if (psr->request_state == PSR_DISABLE)

			continue;
@@ -183,6 +191,7 @@ void rockchip_drm_psr_flush(struct drm_device *dev) 


		psr_set_state(psr, PSR_FLUSH);

	}

	spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);

}

EXPORT_SYMBOL(rockchip_drm_psr_flush);
@@ -199,6 +208,7 @@ int rockchip_drm_psr_register(struct drm_encoder *encoder, 
{

	struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;

	struct psr_drv *psr;

	unsigned long flags;



	if (!encoder || !psr_set)

		return -EINVAL;
@@ -215,9 +225,9 @@ int rockchip_drm_psr_register(struct drm_encoder *encoder, 
	psr->encoder = encoder;

	psr->set = psr_set;



	mutex_lock(&drm_drv->psr_list_mutex);

	spin_lock_irqsave(&drm_drv->psr_list_lock, flags);

	list_add_tail(&psr->list, &drm_drv->psr_list);

	mutex_unlock(&drm_drv->psr_list_mutex);

	spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);



	return 0;

}
@@ -235,8 +245,9 @@ void rockchip_drm_psr_unregister(struct drm_encoder *encoder) 
{

	struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;

	struct psr_drv *psr, *n;

	unsigned long flags;



	mutex_lock(&drm_drv->psr_list_mutex);

	spin_lock_irqsave(&drm_drv->psr_list_lock, flags);

	list_for_each_entry_safe(psr, n, &drm_drv->psr_list, list) {

		if (psr->encoder == encoder) {

			del_timer(&psr->flush_timer);
@@ -244,6 +255,6 @@ void rockchip_drm_psr_unregister(struct drm_encoder *encoder) 
			kfree(psr);

		}

	}

	mutex_unlock(&drm_drv->psr_list_mutex);

	spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);

}

EXPORT_SYMBOL(rockchip_drm_psr_unregister);