linux-kernel - [PATCH] staging:iio:ad7298: Fix linker error due to missing IIO kfifo buffer

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Date:	Mon, 11 Jun 2012 15:09:21 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jonathan Cameron <jic23@....ac.uk>,
	Randy Dunlap <rdunlap@...otime.net>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-iio@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH] staging:iio:ad7298: Fix linker error due to missing IIO kfifo buffer

The ad7298 drivers buffer implementation uses the IIO kfifo buffer, so it needs
to select IIO_KFIFO_BUF. Otherwise (if no other driver selects the symbol) the
following linker error will occur:

drivers/built-in.o: In function `ad7298_register_ring_funcs_and_init':
	(.text+0x245cf2): undefined reference to `iio_kfifo_allocate'
drivers/built-in.o: In function `ad7298_register_ring_funcs_and_init':
	(.text+0x245d7d): undefined reference to `iio_kfifo_free'
drivers/built-in.o: In function `ad7298_ring_cleanup':
	(.text+0x245dcd): undefined reference to `iio_kfifo_free'

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Reported-by: Randy Dunlap <rdunlap@...otime.net>

---
The patch is only required for 3.5-rc1+. Versions prior to 3.5-rc1 require a
different patch (IIO_SW_RING instead of IIO_KFIFO_BUF) which I'll send to stable
once this patch is in Linus' tree.
---
 drivers/staging/iio/adc/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index 2490dd2..8f1b3af 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -13,6 +13,7 @@ config AD7291
 config AD7298
 	tristate "Analog Devices AD7298 ADC driver"
 	depends on SPI
+	select IIO_KFIFO_BUF if IIO_BUFFER
 	help
 	  Say yes here to build support for Analog Devices AD7298
 	  8 Channel ADC with temperature sensor.
-- 
1.7.10

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