linux-kernel - [PATCH 5.4 041/222] iio: chemical: pms7003: fix unmet triggered buffer dependency

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Date:   Wed, 22 Jan 2020 10:27:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomasz Duszynski <tduszyns@...il.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.4 041/222] iio: chemical: pms7003: fix unmet triggered buffer dependency

From: Tomasz Duszynski <tduszyns@...il.com>

commit 217afe63ccf445fc220e5ef480683607b05c0aa5 upstream.

IIO triggered buffer depends on IIO buffer which is missing from Kconfig
file. This should go unnoticed most of the time because there's a
chance something else has already enabled buffers. In some rare cases
though one might experience kbuild warnings about unmet direct
dependencies and build failures due to missing symbols.

Fix this by selecting IIO_BUFFER explicitly.

Signed-off-by: Tomasz Duszynski <tduszyns@...il.com>
Fixes: a1d642266c14 ("iio: chemical: add support for Plantower PMS7003 sensor")
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/chemical/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/chemical/Kconfig
+++ b/drivers/iio/chemical/Kconfig
@@ -65,6 +65,7 @@ config IAQCORE
 config PMS7003
 	tristate "Plantower PMS7003 particulate matter sensor"
 	depends on SERIAL_DEV_BUS
+	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
 	  Say Y here to build support for the Plantower PMS7003 particulate