| Message ID | 1404928177-26554-2-git-send-email-bigeasy@linutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Jul 9, 2014 at 7:49 PM, Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote: > + * The lock assumption made here is none because runtime-pm suspend/resume > + * callbacks should not be invoked there is any operation performed on the port. I think there's a missing "if"? Best, OG. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 07/10/2014 04:30 PM, Olivier Galibert wrote: > On Wed, Jul 9, 2014 at 7:49 PM, Sebastian Andrzej Siewior > <bigeasy@linutronix.de> wrote: >> + * The lock assumption made here is none because runtime-pm suspend/resume >> + * callbacks should not be invoked there is any operation performed on the port. > > I think there's a missing "if"? Thanks, fixed up. > Best, > > OG. > Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 1ebf853..34c3cd1 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -110,6 +110,8 @@ static inline void serial_dl_write(struct uart_8250_port *up, int value) up->dl_write(up, value); } +struct uart_8250_port *serial8250_get_port(int line); + #if defined(__alpha__) && !defined(CONFIG_PCI) /* * Digital did something really horribly wrong with the OUT1 and OUT2 diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 7a91c6d..6db2ee2 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2755,6 +2755,23 @@ static struct uart_ops serial8250_pops = { static struct uart_8250_port serial8250_ports[UART_NR]; +/** + * serial8250_get_port - retrieve struct uart_8250_port + * @line: serial line number + * + * This function retrieves struct uart_8250_port for the specific line. + * This struct *must* *not* be used to perform a 8250 or serial core operation + * which is not accessible otherwise. Its only purpose is to make the struct + * accessible to the runtime-pm callbacks for context suspend/restore. + * The lock assumption made here is none because runtime-pm suspend/resume + * callbacks should not be invoked there is any operation performed on the port. + */ +struct uart_8250_port *serial8250_get_port(int line) +{ + return &serial8250_ports[line]; +} +EXPORT_SYMBOL_GPL(serial8250_get_port); + static void (*serial8250_isa_config)(int port, struct uart_port *up, unsigned short *capabilities);
There is no access to access a struct uart_8250_port for a specific line. This is only required outside of the 8250/uart callbacks like for devices' suspend & remove callbacks. For those the 8250-core provides wrapper like serial8250_unregister_port() which passes the struct to the proper function based on the line argument. For runtime suspend I need access to this struct not only to make serial_out() work but also to properly restore up->ier and up->mcr. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- drivers/tty/serial/8250/8250.h | 2 ++ drivers/tty/serial/8250/8250_core.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+)