diff options
| author | Krzysztof Kozlowski <krzk@kernel.org> | 2020-12-07 20:05:15 +0100 |
|---|---|---|
| committer | Krzysztof Kozlowski <krzk@kernel.org> | 2021-01-03 17:02:56 +0100 |
| commit | 4561560dfb4f847a0b327d48bdd1f45bf1b6261f (patch) | |
| tree | b3e9e53d63e4ce5dfd719a0ef5e1d48e0df3cef8 /drivers/soc/samsung/exynos-asv.c | |
| parent | 0458b88267c637fb872b0359da9ff0b243081e9e (diff) | |
| download | linux-4561560dfb4f847a0b327d48bdd1f45bf1b6261f.tar.bz2 | |
soc: samsung: exynos-asv: handle reading revision register error
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: 5ea428595cc5 ("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
Diffstat (limited to 'drivers/soc/samsung/exynos-asv.c')
| -rw-r--r-- | drivers/soc/samsung/exynos-asv.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c index f653e3533f0f..5daeadc36382 100644 --- a/drivers/soc/samsung/exynos-asv.c +++ b/drivers/soc/samsung/exynos-asv.c @@ -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: |