Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9d778a69370cc1b643b13648df971c83ff5654ef
Commit: 9d778a69370cc1b643b13648df971c83ff5654ef
Parent: 74a197417240120d638d67d74f48655fb7f46f16
Author: Russell King <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 22:27:51 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 09:44:09 2008 -0800
serial: avoid waking up closed serial ports on resume
When we boot, serial ports remain in low power mode until they're used
either
by userspace or for the kernel console.
However, if you suspend the system, and then resume, all serial ports will
be
taken out of low power mode. This is bad news for embedded devices where
this
can mean higher power consumption.
Only bring a serial port out of low power mode if the port is being used as
the kernel console, or is in use by userspace.
Signed-off-by: Russell King <[EMAIL PROTECTED]>
Acked-by: Alan Cox <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/serial/serial_core.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 0cf382b..2554d2f 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -2029,8 +2029,6 @@ int uart_resume_port(struct uart_driver *drv, struct
uart_port *port)
}
port->suspended = 0;
- uart_change_pm(state, 0);
-
/*
* Re-enable the console device after suspending.
*/
@@ -2049,6 +2047,7 @@ int uart_resume_port(struct uart_driver *drv, struct
uart_port *port)
if (state->info && state->info->tty && termios.c_cflag == 0)
termios = *state->info->tty->termios;
+ uart_change_pm(state, 0);
port->ops->set_termios(port, &termios, NULL);
console_start(port->cons);
}
@@ -2057,6 +2056,7 @@ int uart_resume_port(struct uart_driver *drv, struct
uart_port *port)
const struct uart_ops *ops = port->ops;
int ret;
+ uart_change_pm(state, 0);
ops->set_mctrl(port, 0);
ret = ops->startup(port);
if (ret == 0) {
-
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