[hijacking the thread since it has the right Cc list already, sorry]
I stumbled over this doing randconfig builds on linux-next
8<----------
>From c11f54f1e5ea0557e076867ca31c90bcb20e3e0c Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <a...@arndb.de>
Date: Tue, 29 Apr 2014 11:41:40 +0200
Subject: [PATCH] mmc: rtsx: usb backend needs LED support
Building the rtsx USB driver requires the LED classdev base
support, otherwise we get this build error:
drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_remove':
:(.text+0x806480): undefined reference to `led_classdev_unregister'
drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_probe':
:(.text+0x806708): undefined reference to `led_classdev_register'
This adds an explicit dependency in Kconfig
Signed-off-by: Arnd Bergmann <a...@arndb.de>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 92d91fe..66aedf3 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -696,6 +696,7 @@ config MMC_REALTEK_PCI
config MMC_REALTEK_USB
tristate "Realtek USB SD/MMC Card Interface Driver"
depends on MFD_RTSX_USB
+ depends on LEDS_CLASS
help
Say Y here to include driver code to support SD/MMC card interface
of Realtek RTS5129/39 series card reader
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