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serial_core: Move sysrq functions from header file 

It's not worth to have them in every serial driver and I'm about to add
another helper function.

Signed-off-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20200109215444.95995-2-dima@arista.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Safonov 2020-01-09 21:54:42 +00:00 committed by Greg Kroah-Hartman
parent 8c44f9b566
commit 8e20fc3917
2 changed files with 88 additions and 79 deletions
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83
drivers/tty/serial/serial_core.c
View File

@ -3082,6 +3082,89 @@ void uart_insert_char(struct uart_port *port, unsigned int status,
}
EXPORT_SYMBOL_GPL(uart_insert_char);
int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
return 0;
if (!port->has_sysrq || !port->sysrq)
return 0;
if (ch && time_before(jiffies, port->sysrq)) {
handle_sysrq(ch);
port->sysrq = 0;
return 1;
}
port->sysrq = 0;
return 0;
}
EXPORT_SYMBOL_GPL(uart_handle_sysrq_char);
int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
{
if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
return 0;
if (!port->has_sysrq || !port->sysrq)
return 0;
if (ch && time_before(jiffies, port->sysrq)) {
port->sysrq_ch = ch;
port->sysrq = 0;
return 1;
}
port->sysrq = 0;
return 0;
}
EXPORT_SYMBOL_GPL(uart_prepare_sysrq_char);
void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
{
int sysrq_ch;
if (!port->has_sysrq) {
spin_unlock_irqrestore(&port->lock, irqflags);
return;
}
sysrq_ch = port->sysrq_ch;
port->sysrq_ch = 0;
spin_unlock_irqrestore(&port->lock, irqflags);
if (sysrq_ch)
handle_sysrq(sysrq_ch);
}
EXPORT_SYMBOL_GPL(uart_unlock_and_check_sysrq);
/*
* We do the SysRQ and SAK checking like this...
*/
int uart_handle_break(struct uart_port *port)
{
struct uart_state *state = port->state;
if (port->handle_break)
port->handle_break(port);
if (port->has_sysrq) {
if (port->cons && port->cons->index == port->line) {
if (!port->sysrq) {
port->sysrq = jiffies + HZ*5;
return 1;
}
port->sysrq = 0;
}
}
if (port->flags & UPF_SAK)
do_SAK(state->port.tty);
return 0;
}
EXPORT_SYMBOL_GPL(uart_handle_break);
EXPORT_SYMBOL(uart_write_wakeup);
EXPORT_SYMBOL(uart_register_driver);
EXPORT_SYMBOL(uart_unregister_driver);

84
include/linux/serial_core.h
View File

@ -460,85 +460,11 @@ extern void uart_handle_cts_change(struct uart_port *uport,
extern void uart_insert_char(struct uart_port *port, unsigned int status,
unsigned int overrun, unsigned int ch, unsigned int flag);
static inline int
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
return 0;
if (!port->has_sysrq || !port->sysrq)
return 0;
if (ch && time_before(jiffies, port->sysrq)) {
handle_sysrq(ch);
port->sysrq = 0;
return 1;
}
port->sysrq = 0;
return 0;
}
static inline int
uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
{
if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
return 0;
if (!port->has_sysrq || !port->sysrq)
return 0;
if (ch && time_before(jiffies, port->sysrq)) {
port->sysrq_ch = ch;
port->sysrq = 0;
return 1;
}
port->sysrq = 0;
return 0;
}
static inline void
uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
{
int sysrq_ch;
if (!port->has_sysrq) {
spin_unlock_irqrestore(&port->lock, irqflags);
return;
}
sysrq_ch = port->sysrq_ch;
port->sysrq_ch = 0;
spin_unlock_irqrestore(&port->lock, irqflags);
if (sysrq_ch)
handle_sysrq(sysrq_ch);
}
/*
* We do the SysRQ and SAK checking like this...
*/
static inline int uart_handle_break(struct uart_port *port)
{
struct uart_state *state = port->state;
if (port->handle_break)
port->handle_break(port);
if (port->has_sysrq) {
if (port->cons && port->cons->index == port->line) {
if (!port->sysrq) {
port->sysrq = jiffies + HZ*5;
return 1;
}
port->sysrq = 0;
}
}
if (port->flags & UPF_SAK)
do_SAK(state->port.tty);
return 0;
}
extern int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch);
extern int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch);
extern void uart_unlock_and_check_sysrq(struct uart_port *port,
unsigned long irqflags);
extern int uart_handle_break(struct uart_port *port);
/*
* UART_ENABLE_MS - determine if port should enable modem status irqs