linux-kernel - [PATCH 4/5] media: marvel-ccic: allow ccic and mmp drivers to coexist

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Message-Id: <20180525152523.2821369-4-arnd@arndb.de>
Date:   Fri, 25 May 2018 17:25:11 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Bhumika Goyal <bhumirks@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] media: marvel-ccic: allow ccic and mmp drivers to coexist

Randconfig builds fail when one of the two is a built-in driver and
the other one is a loadable module:

drivers/media/platform/marvell-ccic/mcam-core.o: In function `mccic_register':
mcam-core.c:(.text+0x2594): undefined reference to `__this_module'
drivers/media/platform/marvell-ccic/mcam-core.o:(.rodata+0x50): undefined reference to `__this_module'

The problem is that mcam-core.c can not be built both ways at the smae
time. However, we can make kbuild take care of that by making the core
driver a separate module, which can be either built-in or loadable
as needed.
Making it a separate module requires exporting a few symbols and
adding the module license from the header.

Fixes: 0a9c643c8faa ("media: marvel-ccic: re-enable mmp-driver build")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/platform/marvell-ccic/Makefile    | 9 ++++-----
 drivers/media/platform/marvell-ccic/mcam-core.c | 9 ++++++++-
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/marvell-ccic/Makefile b/drivers/media/platform/marvell-ccic/Makefile
index 05a792c579a2..b3a4d0cdccb8 100644
--- a/drivers/media/platform/marvell-ccic/Makefile
+++ b/drivers/media/platform/marvell-ccic/Makefile
@@ -1,6 +1,5 @@
-obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
-cafe_ccic-y := cafe-driver.o mcam-core.o
-
-obj-$(CONFIG_VIDEO_MMP_CAMERA) += mmp_camera.o
-mmp_camera-y := mmp-driver.o mcam-core.o
+obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o mcam-core.o
+cafe_ccic-y := cafe-driver.o
 
+obj-$(CONFIG_VIDEO_MMP_CAMERA) += mmp_camera.o mcam-core.o
+mmp_camera-y := mmp-driver.o
diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
index 80670eeee142..dfdbd4354b74 100644
--- a/drivers/media/platform/marvell-ccic/mcam-core.c
+++ b/drivers/media/platform/marvell-ccic/mcam-core.c
@@ -1720,6 +1720,7 @@ int mccic_irq(struct mcam_camera *cam, unsigned int irqs)
 	}
 	return handled;
 }
+EXPORT_SYMBOL_GPL(mccic_irq);
 
 /* ---------------------------------------------------------------------- */
 /*
@@ -1830,7 +1831,7 @@ int mccic_register(struct mcam_camera *cam)
 	v4l2_device_unregister(&cam->v4l2_dev);
 	return ret;
 }
-
+EXPORT_SYMBOL_GPL(mccic_register);
 
 void mccic_shutdown(struct mcam_camera *cam)
 {
@@ -1850,6 +1851,7 @@ void mccic_shutdown(struct mcam_camera *cam)
 	v4l2_ctrl_handler_free(&cam->ctrl_handler);
 	v4l2_device_unregister(&cam->v4l2_dev);
 }
+EXPORT_SYMBOL_GPL(mccic_shutdown);
 
 /*
  * Power management
@@ -1868,6 +1870,7 @@ void mccic_suspend(struct mcam_camera *cam)
 	}
 	mutex_unlock(&cam->s_mutex);
 }
+EXPORT_SYMBOL_GPL(mccic_suspend);
 
 int mccic_resume(struct mcam_camera *cam)
 {
@@ -1898,4 +1901,8 @@ int mccic_resume(struct mcam_camera *cam)
 	}
 	return ret;
 }
+EXPORT_SYMBOL_GPL(mccic_resume);
 #endif /* CONFIG_PM */
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Jonathan Corbet <corbet@....net>");
-- 
2.9.0