[PATCH] firmware: qemu config needs I/O ports
From: somlo@cmu.edu (Gabriel L. Somlo)
Date: 2016-02-11 14:34:40
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On Thu, Feb 11, 2016 at 03:23:51PM +0100, Arnd Bergmann wrote:
Not all machines have PCI style I/O port memory, or they do not allow mapping it using the ioport_map() function, whcih results in a build error with the newly added qemu firmware code: drivers/firmware/built-in.o: In function `fw_cfg_io_cleanup': qemu_fw_cfg.c:(.text+0x144): undefined reference to `ioport_unmap' drivers/firmware/built-in.o: In function `fw_cfg_sysfs_probe': qemu_fw_cfg.c:(.text+0xb18): undefined reference to `ioport_map' This adds a Kconfig dependency to ensure the driver can only be built on platforms that support it.
Thanks for catching this; as it turns out, an IOPORT_MAP-less machine wasn't among the things I tried when testing the build process on various architectures... Acked-by: Gabriel Somlo <somlo@cmu.edu>
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Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 75f3e8e47f38 ("firmware: introduce sysfs driver for QEMU's fw_cfg device") --- drivers/firmware/Kconfig | 1 + 1 file changed, 1 insertion(+)diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index 5130f74ae3bd..6664f1108c7c 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig@@ -164,6 +164,7 @@ config RASPBERRYPI_FIRMWARE config FW_CFG_SYSFS tristate "QEMU fw_cfg device support in sysfs" depends on SYSFS && (ARM || ARM64 || PPC_PMAC || SPARC || X86) + depends on HAS_IOPORT_MAP default n help Say Y or M here to enable the exporting of the QEMU firmware-- 2.7.0