On Thursday 27 July 2017 10:43 PM, Krzysztof Kozlowski wrote:

Commit 87b132bc0315 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use generic dmaengine API") moved ioremap() call from s3c-i2s-v2.c:s3c_i2sv2_probe() to s3c2412-i2s.c:s3c2412_iis_dev_probe() and converted it to devm- resource managed interface.

However the error path in first of them - s3c_i2sv2_probe() - was not updated. If getting a iis clock in s3c_i2sv2_probe() failed, the address space would be unmapped there. This could lead to:

1. double iounmap() later from devm-interface of s3c2412_iis_dev_probe()),
2. accessing the memory by other functions in s3c2412-i2s.c unit.

Anyway, the owner of this mapped region should be s3c2412-i2s.c because it starts the mapping.

Affected are drivers for S3C24xx family although issue was not reproduced.

Fixes: 87b132bc0315 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use generic dmaengine API") Signed-off-by: Krzysztof Kozlowski krzk@kernel.org

Acked-by: Arvind Yadavarvind.yadav.cs@gmail.com

---

Not marking as Cc-stable because this is theoretical problem, not reproduced and also not tested.

Please, kindly test on S3C24xx hardware.

Changes since v1:

1. None

---

sound/soc/samsung/s3c-i2s-v2.c | 1 - 1 file changed, 1 deletion(-)

diff --git a/sound/soc/samsung/s3c-i2s-v2.c b/sound/soc/samsung/s3c-i2s-v2.c index ca522a95160b..9b28046eea8e 100644 --- a/sound/soc/samsung/s3c-i2s-v2.c +++ b/sound/soc/samsung/s3c-i2s-v2.c @@ -634,7 +634,6 @@ int s3c_i2sv2_probe(struct snd_soc_dai *dai, i2s->iis_pclk = clk_get(dev, "iis"); if (IS_ERR(i2s->iis_pclk)) { dev_err(dev, "failed to get iis_clock\n");

• iounmap(i2s->regs);
  

  return -ENOENT; }

Hi,

On Thursday 27 July 2017 10:43 PM, Krzysztof Kozlowski wrote:

The s3c_i2sv2_probe() only enabled iis clock. Missing prepare isn't probably fatal, because for SoC clocks this is usually no-op, but for correctness this clock should be prepared.

Signed-off-by: Krzysztof Kozlowski krzk@kernel.org

---

Changes since v1:

1. New patch

---

sound/soc/samsung/s3c-i2s-v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/samsung/s3c-i2s-v2.c b/sound/soc/samsung/s3c-i2s-v2.c index 9b28046eea8e..3894bda06ebb 100644 --- a/sound/soc/samsung/s3c-i2s-v2.c +++ b/sound/soc/samsung/s3c-i2s-v2.c @@ -637,7 +637,7 @@ int s3c_i2sv2_probe(struct snd_soc_dai *dai, return -ENOENT; }

• clk_enable(i2s->iis_pclk);

• clk_prepare_enable(i2s->iis_pclk);

Please, handle are return value of clk_prepare_enble.

/* Mark ourselves as in TXRX mode so we can run through our cleanup * process without warnings. */

~arvind

On Friday 28 July 2017 11:14 AM, Krzysztof Kozlowski wrote:

On Fri, Jul 28, 2017 at 10:11:48AM +0530, Arvind Yadav wrote:

...

Hi,

On Thursday 27 July 2017 10:43 PM, Krzysztof Kozlowski wrote:

...

The s3c_i2sv2_probe() only enabled iis clock. Missing prepare isn't probably fatal, because for SoC clocks this is usually no-op, but for correctness this clock should be prepared.

Signed-off-by: Krzysztof Kozlowski krzk@kernel.org

Acked-by: Arvind Yadav<arvind.yadav.cs@gmail.com mailto:arvind.yadav.cs@gmail.com>

...

...

---

Changes since v1:

1. New patch

---

sound/soc/samsung/s3c-i2s-v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/samsung/s3c-i2s-v2.c b/sound/soc/samsung/s3c-i2s-v2.c index 9b28046eea8e..3894bda06ebb 100644 --- a/sound/soc/samsung/s3c-i2s-v2.c +++ b/sound/soc/samsung/s3c-i2s-v2.c @@ -637,7 +637,7 @@ int s3c_i2sv2_probe(struct snd_soc_dai *dai, return -ENOENT; }

• clk_enable(i2s->iis_pclk);

• clk_prepare_enable(i2s->iis_pclk);

Please, handle are return value of clk_prepare_enble.

Which is a different issue, different bug. We can fix it but it should be not mixed with this fix here.

Best regards, Krzysztof

The patch

ASoC: samsung: Add proper error paths to s3c24xx I2S driver

has been applied to the asoc tree at

git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying to this mail.

Thanks, Mark

From 6f187f7ef1c15dca9f720b18a7e928718fd1a8b3 Mon Sep 17 00:00:00 2001

From: Krzysztof Kozlowski krzk@kernel.org Date: Thu, 27 Jul 2017 19:13:38 +0200 Subject: [PATCH] ASoC: samsung: Add proper error paths to s3c24xx I2S driver

s3c2412_i2s_probe() might fail so driver has to revert work done by s3c_i2sv2_probe() (clock enabling). Missing doing this would lead to clock enable in-balance.

Signed-off-by: Krzysztof Kozlowski krzk@kernel.org Acked-by: Arvind Yadav arvind.yadav.cs@gmail.com Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/samsung/s3c-i2s-v2.c | 9 +++++++++ sound/soc/samsung/s3c-i2s-v2.h | 7 +++++++ sound/soc/samsung/s3c2412-i2s.c | 13 +++++++++---- 3 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/sound/soc/samsung/s3c-i2s-v2.c b/sound/soc/samsung/s3c-i2s-v2.c index 3894bda06ebb..58c3e9bfc6b7 100644 --- a/sound/soc/samsung/s3c-i2s-v2.c +++ b/sound/soc/samsung/s3c-i2s-v2.c @@ -651,6 +651,15 @@ int s3c_i2sv2_probe(struct snd_soc_dai *dai, } EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);

+void s3c_i2sv2_cleanup(struct snd_soc_dai *dai, + struct s3c_i2sv2_info *i2s) +{ + clk_disable_unprepare(i2s->iis_pclk); + clk_put(i2s->iis_pclk); + i2s->iis_pclk = NULL; +} +EXPORT_SYMBOL_GPL(s3c_i2sv2_cleanup); + #ifdef CONFIG_PM static int s3c2412_i2s_suspend(struct snd_soc_dai *dai) { diff --git a/sound/soc/samsung/s3c-i2s-v2.h b/sound/soc/samsung/s3c-i2s-v2.h index 182d80564e37..3fca20f7a853 100644 --- a/sound/soc/samsung/s3c-i2s-v2.h +++ b/sound/soc/samsung/s3c-i2s-v2.h @@ -92,6 +92,13 @@ extern int s3c_i2sv2_probe(struct snd_soc_dai *dai, unsigned long base);

/** + * s3c_i2sv2_cleanup - cleanup resources allocated in s3c_i2sv2_probe + * @dai: The ASoC DAI structure supplied to the original probe. + * @i2s: Our local i2s structure to fill in. + */ +extern void s3c_i2sv2_cleanup(struct snd_soc_dai *dai, + struct s3c_i2sv2_info *i2s); +/** * s3c_i2sv2_register_component - register component and dai with soc core * @dev: DAI device * @id: DAI ID diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c index bcd1cbdeac93..cc0840fff5aa 100644 --- a/sound/soc/samsung/s3c2412-i2s.c +++ b/sound/soc/samsung/s3c2412-i2s.c @@ -65,7 +65,8 @@ static int s3c2412_i2s_probe(struct snd_soc_dai *dai) s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk"); if (IS_ERR(s3c2412_i2s.iis_cclk)) { pr_err("failed to get i2sclk clock\n"); - return PTR_ERR(s3c2412_i2s.iis_cclk); + ret = PTR_ERR(s3c2412_i2s.iis_cclk); + goto err; }

/* Set MPLL as the source for IIS CLK */ @@ -73,20 +74,24 @@ static int s3c2412_i2s_probe(struct snd_soc_dai *dai) clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll")); ret = clk_prepare_enable(s3c2412_i2s.iis_cclk); if (ret) - return ret; - - s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk; + goto err;

/* Configure the I2S pins (GPE0...GPE4) in correct mode */ s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2), S3C_GPIO_PULL_NONE);

return 0; + +err: + s3c_i2sv2_cleanup(dai, &s3c2412_i2s); + + return ret; }

static int s3c2412_i2s_remove(struct snd_soc_dai *dai) { clk_disable_unprepare(s3c2412_i2s.iis_cclk); + s3c_i2sv2_cleanup(dai, &s3c2412_i2s);

return 0; }