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Subject[PATCH v3 5/5] tty: serial: samsung: Fix console registration from module
Date
On modern Exynos SoCs (like Exynos850) the UART can be implemented as a
part of USI IP-core. In such case, USI driver is used to initialize USI
registers, and it also calls of_platform_populate() to instantiate all
sub-nodes (e.g. serial node) of USI node. When serial driver is
built-in, but USI driver is a module, and CONFIG_SERIAL_SAMSUNG_CONSOLE
is enabled, next call chain will happen when loading USI module from
user space:

usi_init
v
usi_probe
v
of_platform_populate
v
s3c24xx_serial_probe
v
uart_add_one_port
v
uart_configure_port
v
register_console
v
try_enable_new_console
v
s3c24xx_serial_console_setup

But because the serial driver is built-in, and
s3c24xx_serial_console_setup() is marked with __init keyword, that
symbol will discarded and long gone by that time already, causing failed
paging request.

That happens during the next config combination:

EXYNOS_USI=m
SERIAL_SAMSUNG=y
SERIAL_SAMSUNG_CONSOLE=y

That config should be completely possible, so rather than limiting
SERIAL_SAMSUNG choice to "m" only when USI=m, remove __init keyword for
all affected functions.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
Changes in v3:
- (none)

Changes in v2:
- This patch is added in v2

drivers/tty/serial/samsung_tty.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 61ccb359620a..d002a4e48ed9 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -2500,7 +2500,8 @@ s3c24xx_serial_console_write(struct console *co, const char *s,
uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
}

-static void __init
+/* Shouldn't be __init, as it can be instantiated from other module */
+static void
s3c24xx_serial_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
@@ -2563,7 +2564,8 @@ s3c24xx_serial_get_options(struct uart_port *port, int *baud,
}
}

-static int __init
+/* Shouldn't be __init, as it can be instantiated from other module */
+static int
s3c24xx_serial_console_setup(struct console *co, char *options)
{
struct uart_port *port;
--
2.30.2
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