linux-kernel - [PATCH 4.4 106/137] iio: st_magn: always define ST_MAGN_TRIGGER_SET

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Date:	Mon, 18 Apr 2016 11:29:28 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Denis Ciocca <denis.ciocca@...com>,
	Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 4.4 106/137] iio: st_magn: always define ST_MAGN_TRIGGER_SET_STATE

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit 9b090a98e95c2530ef0ce474e3b6218621b8ae25 upstream.

When CONFIG_IIO_TRIGGER is enabled but CONFIG_IIO_BUFFER is
not, we get a build error in the st_magn driver:

drivers/iio/magnetometer/st_magn_core.c:573:23: error: 'ST_MAGN_TRIGGER_SET_STATE' undeclared here (not in a function)
  .set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
                       ^~~~~~~~~~~~~~~~~~~~~~~~~

Apparently, this ST_MAGN_TRIGGER_SET_STATE macro was meant to
be set to NULL when the definition is not available because
st_magn_buffer.c is not compiled, but the alternative definition
was not included in the original patch. This adds it.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: 74f5683f35fe ("iio: st_magn: Add irq trigger handling")
Acked-by: Denis Ciocca <denis.ciocca@...com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/magnetometer/st_magn.h |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/magnetometer/st_magn.h
+++ b/drivers/iio/magnetometer/st_magn.h
@@ -44,6 +44,7 @@ static inline int st_magn_allocate_ring(
 static inline void st_magn_deallocate_ring(struct iio_dev *indio_dev)
 {
 }
+#define ST_MAGN_TRIGGER_SET_STATE NULL
 #endif /* CONFIG_IIO_BUFFER */
 
 #endif /* ST_MAGN_H */