Commit 1997e9df authored by Dmitry Safonov's avatar Dmitry Safonov Committed by Greg Kroah-Hartman

serial_core: Un-ifdef sysrq SUPPORT_SYSRQ

The SUPPORT_SYSRQ is messy: every .c source should define it before
including "serial_core.h" if sysrq is supported or struct uart_port will
differ in sizes. Also this prevents moving to serial_core.c functions:
uart_handle_sysrq_char(), uart_prepare_sysrq_char(),
uart_unlock_and_check_sysrq().

It doesn't save many bytes in the structure, and a better way to reduce
it's size would be making rs485 and iso7816 pointers.

Introduce `has_sysrq` member to be used by serial line drivers further.
Signed-off-by: default avatarDmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20191213000657.931618-4-dima@arista.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8336240e
......@@ -240,14 +240,13 @@ struct uart_port {
resource_size_t mapsize;
struct device *dev; /* parent device */
#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
unsigned long sysrq; /* sysrq timeout */
unsigned int sysrq_ch; /* char for sysrq */
#endif
unsigned char has_sysrq;
unsigned char hub6; /* this should be in the 8250 driver */
unsigned char suspended;
unsigned char unused[2];
unsigned char unused;
const char *name; /* port name */
struct attribute_group *attr_group; /* port specific attributes */
const struct attribute_group **tty_groups; /* all attributes (serial core use only) */
......@@ -461,31 +460,46 @@ 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);
#if defined(SUPPORT_SYSRQ) && defined(CONFIG_MAGIC_SYSRQ_SERIAL)
static inline int
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
if (port->sysrq) {
if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
return 0;
if (!port->has_sysrq && !IS_ENABLED(SUPPORT_SYSRQ))
return 0;
if (!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 (port->sysrq) {
if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
return 0;
if (!port->has_sysrq && !IS_ENABLED(SUPPORT_SYSRQ))
return 0;
if (!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
......@@ -493,6 +507,11 @@ uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
{
int sysrq_ch;
if (!port->has_sysrq && !IS_ENABLED(SUPPORT_SYSRQ)) {
spin_unlock_irqrestore(&port->lock, irqflags);
return;
}
sysrq_ch = port->sysrq_ch;
port->sysrq_ch = 0;
......@@ -501,17 +520,6 @@ uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
if (sysrq_ch)
handle_sysrq(sysrq_ch);
}
#else
static inline int
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) { return 0; }
static inline int
uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) { return 0; }
static inline void
uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
{
spin_unlock_irqrestore(&port->lock, irqflags);
}
#endif
/*
* We do the SysRQ and SAK checking like this...
......@@ -523,7 +531,7 @@ static inline int uart_handle_break(struct uart_port *port)
if (port->handle_break)
port->handle_break(port);
#ifdef SUPPORT_SYSRQ
if (port->has_sysrq || IS_ENABLED(SUPPORT_SYSRQ)) {
if (port->cons && port->cons->index == port->line) {
if (!port->sysrq) {
port->sysrq = jiffies + HZ*5;
......@@ -531,7 +539,8 @@ static inline int uart_handle_break(struct uart_port *port)
}
port->sysrq = 0;
}
#endif
}
if (port->flags & UPF_SAK)
do_SAK(state->port.tty);
return 0;
......
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