#SPI drivers menuconfig SND_SPI bool "SPI sound devices" depends on SPI default y help Support for sound devices connected via the SPI bus. if SND_SPI config SND_AT73C213 tristate "Atmel AT73C213 DAC driver" depends on ATMEL_SSC select SND_PCM help Say Y here if you want to use the Atmel AT73C213 external DAC. This DAC can be found on Atmel development boards. This driver requires the Atmel SSC driver for sound sink, a peripheral found on most AT91 and AVR32 microprocessors. To compile this driver as a module, choose M here: the module will be called snd-at73c213. config SND_AT73C213_TARGET_BITRATE int "Target bitrate for AT73C213" depends on SND_AT73C213 default "48000" range 8000 50000 help Sets the target bitrate for the bitrate calculator in the driver. Limited by hardware to be between 8000 Hz and 50000 Hz. Set to 48000 Hz by default. endif # SND_SPI ame='id' value='c8f325a59cfc718d13a50fbc746ed9b415c25e92'/> net-next plumbingsTobias Klauser
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /fs/befs/super.c
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'fs/befs/super.c')