linux-kernel - [PATCH] media: i2c: select V4L2

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Message-Id: <20210920095830.1259051-1-arnd@kernel.org>
Date:   Mon, 20 Sep 2021 11:58:24 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Daniele Alessandrelli <daniele.alessandrelli@...el.com>,
        Martina Krasteva <martinax.krasteva@...el.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: i2c: select V4L2_ASYNC where needed

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

I came across a link failure from randconfig builds:

x86_64-linux-ld: drivers/media/i2c/ths8200.o: in function `ths8200_remove':
ths8200.c:(.text+0x491): undefined reference to `v4l2_async_unregister_subdev'
x86_64-linux-ld: drivers/media/i2c/ths8200.o: in function `ths8200_probe':
ths8200.c:(.text+0xe49): undefined reference to `v4l2_async_register_subdev'
x86_64-linux-ld: drivers/media/i2c/tw9910.o: in function `tw9910_remove':
tw9910.c:(.text+0x467): undefined reference to `v4l2_async_unregister_subdev'
x86_64-linux-ld: drivers/media/i2c/tw9910.o: in function `tw9910_probe':
tw9910.c:(.text+0x1123): undefined reference to `v4l2_async_register_subdev'

These clearly lack a 'select' statement, but I don't know why
this started happening only now. I had a bit of a look around to find
other configs that have the same problem, but could not come up with
a reliable way and found nothing else through experimentation.
It is likely that other symbols like these exist that need an extra
select.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/i2c/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 08feb3e8c1bf..d49eecc4fe33 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -450,6 +450,7 @@ config VIDEO_TW9906
 config VIDEO_TW9910
 	tristate "Techwell TW9910 video decoder"
 	depends on VIDEO_V4L2 && I2C
+	select V4L2_ASYNC
 	help
 	  Support for Techwell TW9910 NTSC/PAL/SECAM video decoder.
 
@@ -597,6 +598,7 @@ config VIDEO_AK881X
 config VIDEO_THS8200
 	tristate "Texas Instruments THS8200 video encoder"
 	depends on VIDEO_V4L2 && I2C
+	select V4L2_ASYNC
 	help
 	  Support for the Texas Instruments THS8200 video encoder.
 
-- 
2.29.2