linux-kernel - [PATCH 5.9 204/252] iio: light: fix kconfig dependency bug for VCNL4035

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Date:   Mon, 23 Nov 2020 13:22:34 +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,
        Necip Fazil Yildiran <fazilyildiran@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.9 204/252] iio: light: fix kconfig dependency bug for VCNL4035

From: Necip Fazil Yildiran <fazilyildiran@...il.com>

commit 44a146a44f656fc03d368c1b9248d29a128cd053 upstream.

When VCNL4035 is enabled and IIO_BUFFER is disabled, it results in the
following Kbuild warning:

WARNING: unmet direct dependencies detected for IIO_TRIGGERED_BUFFER
  Depends on [n]: IIO [=y] && IIO_BUFFER [=n]
  Selected by [y]:
  - VCNL4035 [=y] && IIO [=y] && I2C [=y]

The reason is that VCNL4035 selects IIO_TRIGGERED_BUFFER without depending
on or selecting IIO_BUFFER while IIO_TRIGGERED_BUFFER depends on
IIO_BUFFER. This can also fail building the kernel.

Honor the kconfig dependency to remove unmet direct dependency warnings
and avoid any potential build failures.

Fixes: 55707294c4eb ("iio: light: Add support for vishay vcnl4035")
Signed-off-by: Necip Fazil Yildiran <fazilyildiran@...il.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=209883
Link: https://lore.kernel.org/r/20201102223523.572461-1-fazilyildiran@gmail.com
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/light/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -529,6 +529,7 @@ config VCNL4000
 
 config VCNL4035
 	tristate "VCNL4035 combined ALS and proximity sensor"
+	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	select REGMAP_I2C
 	depends on I2C