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| author | Palmer Dabbelt <palmer@rivosinc.com> | 2024-02-14 07:34:30 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-02-19 09:43:33 +0100 |
| commit | 8b79d4e994074a058b6876dce843ee112656258d (patch) | |
| tree | 2191d6e55343163f6bb0fbdadacefce33575f10e /drivers | |
| parent | b401b621758e46812da61fa58a67c3fd8d91de0d (diff) | |
| download | linux-stable-8b79d4e994074a058b6876dce843ee112656258d.tar.gz linux-stable-8b79d4e994074a058b6876dce843ee112656258d.tar.bz2 linux-stable-8b79d4e994074a058b6876dce843ee112656258d.zip | |
tty: hvc: Don't enable the RISC-V SBI console by default
The new SBI console has the same problem as the old one: there's only
one shared backing hardware and no synchronization, so the two drivers
end up stepping on each other. This was the same issue the old SBI-0.1
console drivers had, but that was disabled by default when SBI-0.1 was.
So just mark the new driver as nonportable.
Reported-by: Emil Renner Berthing <kernel@esmil.dk>
Fixes: 88ead68e764c ("tty: Add SBI debug console support to HVC SBI driver")
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240214153429.16484-2-palmer@rivosinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/hvc/Kconfig | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig index 6e05c5c7bca1..c2a4e88b328f 100644 --- a/drivers/tty/hvc/Kconfig +++ b/drivers/tty/hvc/Kconfig @@ -108,13 +108,15 @@ config HVC_DCC_SERIALIZE_SMP config HVC_RISCV_SBI bool "RISC-V SBI console support" - depends on RISCV_SBI + depends on RISCV_SBI && NONPORTABLE select HVC_DRIVER help This enables support for console output via RISC-V SBI calls, which - is normally used only during boot to output printk. + is normally used only during boot to output printk. This driver + conflicts with real console drivers and should not be enabled on + systems that directly access the console. - If you don't know what do to here, say Y. + If you don't know what do to here, say N. config HVCS tristate "IBM Hypervisor Virtual Console Server support" |