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authorTAMUKI Shoichi <tamuki@linet.gr.jp>2010-08-10 18:03:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 08:59:22 -0700
commitc7ff0d9c92435e836e13aaa8d0e56d4000424bcc (patch)
tree96f56d15b5dd96c44fb183ce00152608df50dc5c /drivers/input/serio/i8042.c
parentbebf8cfaea1df1a104b993b995bb385e998a4dc8 (diff)
downloadlinux-c7ff0d9c92435e836e13aaa8d0e56d4000424bcc.tar.bz2
panic: keep blinking in spite of long spin timer mode
To keep panic_timeout accuracy when running under a hypervisor, the current implementation only spins on long time (1 second) calls to mdelay. That brings a good effect, but the problem is the keyboard LEDs don't blink at all on that situation. This patch changes to call to panic_blink_enter() between every mdelay and keeps blinking in spite of long spin timer mode. The time to call to mdelay is now 100ms. Even this change will keep panic_timeout accuracy enough when running under a hypervisor. Signed-off-by: TAMUKI Shoichi <tamuki@linet.gr.jp> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Russell King <linux@arm.linux.org.uk> Acked-by: Dmitry Torokhov <dtor@mail.ru> Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/input/serio/i8042.c')
-rw-r--r--drivers/input/serio/i8042.c25
1 files changed, 5 insertions, 20 deletions
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 258b98b9d7c2..46e4ba0b9246 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -61,10 +61,6 @@ static bool i8042_noloop;
module_param_named(noloop, i8042_noloop, bool, 0);
MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");
-static unsigned int i8042_blink_frequency = 500;
-module_param_named(panicblink, i8042_blink_frequency, uint, 0600);
-MODULE_PARM_DESC(panicblink, "Frequency with which keyboard LEDs should blink when kernel panics");
-
#ifdef CONFIG_X86
static bool i8042_dritek;
module_param_named(dritek, i8042_dritek, bool, 0);
@@ -1030,8 +1026,8 @@ static void i8042_controller_reset(void)
/*
- * i8042_panic_blink() will flash the keyboard LEDs and is called when
- * kernel panics. Flashing LEDs is useful for users running X who may
+ * i8042_panic_blink() will turn the keyboard LEDs on or off and is called
+ * when kernel panics. Flashing LEDs is useful for users running X who may
* not see the console and will help distingushing panics from "real"
* lockups.
*
@@ -1041,22 +1037,12 @@ static void i8042_controller_reset(void)
#define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)
-static long i8042_panic_blink(long count)
+static long i8042_panic_blink(int state)
{
long delay = 0;
- static long last_blink;
- static char led;
-
- /*
- * We expect frequency to be about 1/2s. KDB uses about 1s.
- * Make sure they are different.
- */
- if (!i8042_blink_frequency)
- return 0;
- if (count - last_blink < i8042_blink_frequency)
- return 0;
+ char led;
- led ^= 0x01 | 0x04;
+ led = (state) ? 0x01 | 0x04 : 0;
while (i8042_read_status() & I8042_STR_IBF)
DELAY;
dbg("%02x -> i8042 (panic blink)", 0xed);
@@ -1069,7 +1055,6 @@ static long i8042_panic_blink(long count)
dbg("%02x -> i8042 (panic blink)", led);
i8042_write_data(led);
DELAY;
- last_blink = count;
return delay;
}