diff options
author | Dmitry Safonov <dima@arista.com> | 2020-01-10 00:54:42 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-10 19:48:02 +0300 |
commit | 8e20fc3917117b42de316e87f073a1ca43d94c9f (patch) | |
tree | 5bdaf4ecb1c0a04661ff29254cec26969fa4eabe /drivers/tty/serial/serial_core.c | |
parent | 8c44f9b566a3a2371bca9dcabe450980e039cadf (diff) | |
download | linux-8e20fc3917117b42de316e87f073a1ca43d94c9f.tar.xz |
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>
Diffstat (limited to 'drivers/tty/serial/serial_core.c')
-rw-r--r-- | drivers/tty/serial/serial_core.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 7b87c08f5bcb..76e506ee335c 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -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); |