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Revert "serial: core: Refactor uart_unlock_and_check_sysrq()" 

This reverts commit da9a5aa340.

In order to ease backporting a fix for a sysrq regression, revert this
rewrite which was since added on top.

The other sysrq helpers now bail out early when sysrq is not enabled;
it's better to keep that pattern here as well.

Note that the __releases() attribute won't be needed after the follow-on
fix either.

Fixes: da9a5aa340 ("serial: core: Refactor uart_unlock_and_check_sysrq()")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200610152232.16925-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2020-06-10 17:22:30 +02:00 committed by Greg Kroah-Hartman
parent a71725619f
commit 10652a9e9f
2 changed files with 15 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/tty/serial/serial_core.c
View File

@ -3239,19 +3239,22 @@ int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
}
EXPORT_SYMBOL_GPL(uart_prepare_sysrq_char);
void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long flags)
__releases(&port->lock)
void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
{
if (port->has_sysrq) {
int sysrq_ch = port->sysrq_ch;
int sysrq_ch;
port->sysrq_ch = 0;
spin_unlock_irqrestore(&port->lock, flags);
if (sysrq_ch)
handle_sysrq(sysrq_ch);
} else {
spin_unlock_irqrestore(&port->lock, flags);
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);

3
include/linux/serial_core.h
View File

@ -464,7 +464,8 @@ extern void uart_insert_char(struct uart_port *port, unsigned int status,
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 flags);
extern void uart_unlock_and_check_sysrq(struct uart_port *port,
unsigned long irqflags);
extern int uart_handle_break(struct uart_port *port);
/*