From: Sagar Shrikant Kadam sagar.kadam@sifive.com
commit 17b4efdf4e4867079012a48ca10d965fe9d68822 upstream.
An uninitialised spin lock for sifive serial console raises a bad magic spin_lock error as reported and discussed here [1]. Initialising the spin lock resolves the issue.
The fix is tested on HiFive Unleashed A00 board with Linux 5.7-rc4 and OpenSBI v0.7
[1] https://lore.kernel.org/linux-riscv/b9fe49483a903f404e7acc15a6efbef756db28ae...
Fixes: 45c054d0815b ("tty: serial: add driver for the SiFive UART") Reported-by: Atish Patra Atish.Patra@wdc.com Signed-off-by: Sagar Shrikant Kadam sagar.kadam@sifive.com Reviewed-by: Palmer Dabbelt palmerdabbelt@google.com Acked-by: Palmer Dabbelt palmerdabbelt@google.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/1589019852-21505-2-git-send-email-sagar.kadam@sifi... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/sifive.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c index d5f81b98e4d7..38133eba83a8 100644 --- a/drivers/tty/serial/sifive.c +++ b/drivers/tty/serial/sifive.c @@ -840,6 +840,7 @@ console_initcall(sifive_console_init);
static void __ssp_add_console_port(struct sifive_serial_port *ssp) { + spin_lock_init(&ssp->port.lock); sifive_serial_console_ports[ssp->port.line] = ssp; }