linux-kernel - [PATCH 2/2] [media] Input: synaptics-rmi4: disallow impossible configuration

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Date:   Mon, 12 Sep 2016 17:30:33 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Andrew Duggan <aduggan@...aptics.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Nick Dyer <nick@...anahar.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] [media] Input: synaptics-rmi4: disallow impossible configuration

The newly added debug mode for the synaptics-rmi4 driver relies on
the v4l2 interface and vb2_vmalloc, but those might be configured
as loadable modules when the driver itself is built-in, resulting
in a link failure:

drivers/input/rmi4/rmi_core.o: In function `rmi_f54_remove':
rmi_f54.c:(.text.rmi_f54_remove+0x14): undefined reference to `video_unregister_device'
rmi_f54.c:(.text.rmi_f54_remove+0x20): undefined reference to `v4l2_device_unregister'
drivers/input/rmi4/rmi_core.o: In function `rmi_f54_vidioc_s_input':
rmi_f54.c:(.text.rmi_f54_vidioc_s_input+0x10): undefined reference to `video_devdata'
drivers/input/rmi4/rmi_core.o: In function `rmi_f54_vidioc_g_input':
rmi_f54.c:(.text.rmi_f54_vidioc_g_input+0x10): undefined reference to `video_devdata'
drivers/input/rmi4/rmi_core.o: In function `rmi_f54_vidioc_fmt':
rmi_f54.c:(.text.rmi_f54_vidioc_fmt+0x10): undefined reference to `video_devdata'
drivers/input/rmi4/rmi_core.o: In function `rmi_f54_vidioc_enum_input':
rmi_f54.c:(.text.rmi_f54_vidioc_enum_input+0x10): undefined reference to `video_devdata'
drivers/input/rmi4/rmi_core.o: In function `rmi_f54_vidioc_querycap':
...

The best workaround I could come up with is to disallow the debug
mode unless it's actually possible to call it.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: 3a762dbd5347 ("[media] Input: synaptics-rmi4 - add support for F54 diagnostics")
---
 drivers/input/rmi4/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig
index f3418b65eb41..4c8a55857e00 100644
--- a/drivers/input/rmi4/Kconfig
+++ b/drivers/input/rmi4/Kconfig
@@ -65,7 +65,7 @@ config RMI4_F30
 config RMI4_F54
 	bool "RMI4 Function 54 (Analog diagnostics)"
 	depends on RMI4_CORE
-	depends on VIDEO_V4L2
+	depends on VIDEO_V4L2=y || (RMI4_CORE=m && VIDEO_V4L2=m)
 	select VIDEOBUF2_VMALLOC
 	help
 	  Say Y here if you want to add support for RMI4 function 54
-- 
2.9.0