[PATCH] console: make blank timeout value a boot option

[Daniel Mack]

The console blank timer is currently hardcoded to 10*60 seconds which
might be annoying on systems with no input devices attached to wake up
the console again. Especially during development, disabling the screen
saver can be handy - for example when debugging the root fs mount
mechanism or other scenarios where no userspace program could be started
to do that at runtime from userspace.

This patch defines a core_param for the variable in charge which allows
users to entirely disable the blank feature at boot time by setting it
0. The value can still be overwritten at runtime using the standard
ioctl call - this just allows to conditionally change the default.

Signed-off-by: Daniel Mack <daniel@xxxxxxxx>
---
 Documentation/kernel-parameters.txt |    4 ++++
 drivers/char/vt.c                   |   13 +++++++------
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e87bdbf..67331e8 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -545,6 +545,10 @@ and is between 256 and 4096 characters. It is defined in the file
 			console=brl,ttyS0
 		For now, only VisioBraille is supported.
 
+	consoleblank=	[KNL] The console blank (screen saver) timeout in
+			seconds. Defaults to 10*60 = 10mins. A value of 0
+			disables the blank timer.
+
 	coredump_filter=
 			[KNL] Change the default value for
 			/proc/<pid>/coredump_filter.
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 08151d4..85efe81 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -172,8 +172,9 @@ int do_poke_blanked_console;
 int console_blanked;
 
 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
-static int blankinterval = 10*60*HZ;
 static int vesa_off_interval;
+static int blankinterval = 10*60;
+core_param(consoleblank, blankinterval, int, 0444);
 
 static DECLARE_WORK(console_work, console_callback);
 
@@ -1486,7 +1487,7 @@ static void setterm_command(struct vc_data *vc)
 			update_attr(vc);
 			break;
 		case 9:	/* set blanking interval */
-			blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
+			blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
 			poke_blanked_console();
 			break;
 		case 10: /* set bell frequency in Hz */
@@ -2872,7 +2873,7 @@ static int __init con_init(void)
 
 	if (blankinterval) {
 		blank_state = blank_normal_wait;
-		mod_timer(&console_timer, jiffies + blankinterval);
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
 	}
 
 	/*
@@ -3681,7 +3682,7 @@ void do_unblank_screen(int leaving_gfx)
 		return; /* but leave console_blanked != 0 */
 
 	if (blankinterval) {
-		mod_timer(&console_timer, jiffies + blankinterval);
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
 		blank_state = blank_normal_wait;
 	}
 
@@ -3715,7 +3716,7 @@ void unblank_screen(void)
 static void blank_screen_t(unsigned long dummy)
 {
 	if (unlikely(!keventd_up())) {
-		mod_timer(&console_timer, jiffies + blankinterval);
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
 		return;
 	}
 	blank_timer_expired = 1;
@@ -3745,7 +3746,7 @@ void poke_blanked_console(void)
 	if (console_blanked)
 		unblank_screen();
 	else if (blankinterval) {
-		mod_timer(&console_timer, jiffies + blankinterval);
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
 		blank_state = blank_normal_wait;
 	}
 }
-- 
1.6.3.1

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