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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/crypto/qcom-rng.c
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@@ -7,6 +7,8 @@
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 #include <linux/acpi.h>
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 #include <linux/clk.h>
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 #include <linux/crypto.h>
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+#include <linux/io.h>
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+#include <linux/iopoll.h>
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 #include <linux/module.h>
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 #include <linux/of.h>
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 #include <linux/platform_device.h>
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@@ -42,16 +44,19 @@
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 {
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 	unsigned int currsize = 0;
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 	u32 val;
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+	int ret;
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 	/* read random data from hardware */
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 	do {
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-		val = readl_relaxed(rng->base + PRNG_STATUS);
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-		if (!(val & PRNG_STATUS_DATA_AVAIL))
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-			break;
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+		ret = readl_poll_timeout(rng->base + PRNG_STATUS, val,
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+					 val & PRNG_STATUS_DATA_AVAIL,
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+					 200, 10000);
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+		if (ret)
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+			return ret;
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 		val = readl_relaxed(rng->base + PRNG_DATA_OUT);
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 		if (!val)
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-			break;
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+			return -EINVAL;
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 		if ((max - currsize) >= WORD_SZ) {
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 			memcpy(data, &val, WORD_SZ);
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@@ -64,7 +69,7 @@
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 		}
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 	} while (currsize < max);
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-	return currsize;
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+	return 0;
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 }
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 static int qcom_rng_generate(struct crypto_rng *tfm,
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@@ -86,7 +91,7 @@
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 	mutex_unlock(&rng->lock);
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 	clk_disable_unprepare(rng->clk);
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-	return 0;
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+	return ret;
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 }
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 static int qcom_rng_seed(struct crypto_rng *tfm, const u8 *seed,
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@@ -153,7 +158,6 @@
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 static int qcom_rng_probe(struct platform_device *pdev)
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 {
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-	struct resource *res;
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 	struct qcom_rng *rng;
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 	int ret;
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@@ -164,8 +168,7 @@
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 	platform_set_drvdata(pdev, rng);
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 	mutex_init(&rng->lock);
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-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	rng->base = devm_ioremap_resource(&pdev->dev, res);
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+	rng->base = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(rng->base))
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 		return PTR_ERR(rng->base);
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