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soc: samsung: exynos-asv: handle reading revision register error

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commit 4561560dfb upstream.

If regmap_read() fails, the product_id local variable will contain
random value from the stack.  Do not try to parse such value and fail
the ASV driver probe.

Fixes: 5ea428595c ("soc: samsung: Add Exynos Adaptive Supply Voltage driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Link: https://lore.kernel.org/r/20201207190517.262051-3-krzk@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krzysztof Kozlowski 2020-12-07 20:05:15 +01:00 committed by Greg Kroah-Hartman
parent 3a5daa8a5e
commit 56a7c53c49
1 changed files with 7 additions and 1 deletions
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8
drivers/soc/samsung/exynos-asv.c
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@ -129,7 +129,13 @@ static int exynos_asv_probe(struct platform_device *pdev)
return PTR_ERR(asv->chipid_regmap);
}
regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
ret = regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID,
&product_id);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot read revision from ChipID: %d\n",
ret);
return -ENODEV;
}
switch (product_id & EXYNOS_MASK) {
case 0xE5422000: