[PATCH v2 1/6] drm/rockchip: Convert psr_list_mutex to spinlock and use it

[Sean Paul]

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

Signed-off-by: Sean Paul <seanpaul at chromium.org>
---

Changes in v2:
        - Rebased on 
https://cgit.freedesktop.org/~seanpaul/dogwood/log/?h=for-next

 drivers/gpu/drm/rockchip/rockchip_drm_drv.c |  2 +-
 drivers/gpu/drm/rockchip/rockchip_drm_drv.h |  2 +-
 drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 25 ++++++++++++++++++-------
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c 
b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index b43fe5d9..76eaf1d 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -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);

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h 
b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
index 9c34c9e..5c69845 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -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,
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c 
b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
index a6d3bd25..bd25273 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
@@ -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);
-- 
2.8.0.rc3.226.g39d4020