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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: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
This commit is contained in:
Sean Paul 2016-08-16 16:11:28 -07:00
parent 8f0ac5c483
commit 18d8d4d228
3 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
View File

@ -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);

2
drivers/gpu/drm/rockchip/rockchip_drm_drv.h
View File

@ -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,

25
drivers/gpu/drm/rockchip/rockchip_drm_psr.c
View File

@ -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);