hwrng: ks-sa - access private data via struct hwrng

This driver uses a struct ks_sa_rng for its private data. It contains a
struct hwrng. Call container_of to get from hwrng to ks_sa_rng.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/ks-sa-rng.c

@@ -113,8 +113,7 @@ static unsigned int refill_delay_ns(unsigned long clk_rate)
 static int ks_sa_rng_init(struct hwrng *rng)
 {
 	u32 value;
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 	unsigned long clk_rate = clk_get_rate(ks_sa_rng->clk);
 
 	/* Enable RNG module */
@@ -153,8 +152,7 @@ static int ks_sa_rng_init(struct hwrng *rng)
 
 static void ks_sa_rng_cleanup(struct hwrng *rng)
 {
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 
 	/* Disable RNG */
 	writel(0, &ks_sa_rng->reg_rng->control);
@@ -164,8 +162,7 @@ static void ks_sa_rng_cleanup(struct hwrng *rng)
 
 static int ks_sa_rng_data_read(struct hwrng *rng, u32 *data)
 {
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 
 	/* Read random data */
 	data[0] = readl(&ks_sa_rng->reg_rng->output_l);
@@ -179,8 +176,7 @@ static int ks_sa_rng_data_read(struct hwrng *rng, u32 *data)
 
 static int ks_sa_rng_data_present(struct hwrng *rng, int wait)
 {
-	struct device *dev = (struct device *)rng->priv;
-	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	struct ks_sa_rng *ks_sa_rng = container_of(rng, struct ks_sa_rng, rng);
 	u64 now = ktime_get_ns();
 
 	u32	ready;
@@ -225,7 +221,6 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 		.data_present = ks_sa_rng_data_present,
 		.cleanup = ks_sa_rng_cleanup,
 	};
-	ks_sa_rng->rng.priv = (unsigned long)dev;
 
 	ks_sa_rng->reg_rng = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ks_sa_rng->reg_rng))
@@ -248,8 +243,6 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, ks_sa_rng);
-
 	return devm_hwrng_register(&pdev->dev, &ks_sa_rng->rng);
 }