[PATCH 10/21] drm/tilcdc: Allocate register storage based on the actual number registers

[Jyri Sarha]

Allocate suspend/resume register storage based on the actual number
registers the driver is aware of. The static allocation for register
storage had falen behind badly.

Reported-by: Michael Bode <michael at bumbleB.de>
Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_drv.c | 20 +++++++++++++++++++-
 drivers/gpu/drm/tilcdc/tilcdc_drv.h |  2 +-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 5cbb250..9bc15e7 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -141,11 +141,14 @@ static int tilcdc_unload(struct drm_device *dev)
 
 	pm_runtime_disable(dev->dev);
 
+	kfree(priv->saved_register);
 	kfree(priv);
 
 	return 0;
 }
 
+static size_t tilcdc_num_regs(void);
+
 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 {
 	struct platform_device *pdev = dev->platformdev;
@@ -157,7 +160,11 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 	int ret;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
+	if (priv)
+		priv->saved_register = kcalloc(sizeof(*priv->saved_register),
+					       tilcdc_num_regs(), GFP_KERNEL);
+	if (!priv || !priv->saved_register) {
+		kfree(priv);
 		dev_err(dev->dev, "failed to allocate private data\n");
 		return -ENOMEM;
 	}
@@ -347,6 +354,7 @@ fail_free_wq:
 
 fail_free_priv:
 	dev->dev_private = NULL;
+	kfree(priv->saved_register);
 	kfree(priv);
 	return ret;
 }
@@ -471,6 +479,16 @@ static const struct {
 		REG(2, true,  LCDC_INT_ENABLE_SET_REG),
 #undef REG
 };
+
+static size_t tilcdc_num_regs(void)
+{
+	return ARRAY_SIZE(registers);
+}
+#else
+static size_t tilcdc_num_regs(void)
+{
+	return 0;
+}
 #endif
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.h b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
index 77c600d..80badad 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
@@ -66,7 +66,7 @@ struct tilcdc_drm_private {
 	uint32_t max_width;
 
 	/* register contents saved across suspend/resume: */
-	u32 saved_register[12];
+	u32 *saved_register;
 	bool ctx_valid;
 
 #ifdef CONFIG_CPU_FREQ
-- 
1.9.1