ASoC: samsung: Fix possible double iounmap on s3c24xx driver probe failure

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Commit 87b132bc03 ("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: 87b132bc03 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use generic dmaengine API")
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>

...

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Krzysztof Kozlowski 2017-07-27 19:13:36 +02:00 • committed by Mark Brown

parent 0f11daf10b

commit 776bac64bf

1 changed files with 0 additions and 1 deletions

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sound/soc/samsung/s3c-i2s-v2.c

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