From fe0c935a6cbf25d72a27c7a345df8a2151de0b74 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 30 Apr 2007 15:09:51 -0700 Subject: rework pm_ops pm_disk_mode, kill misuse This patch series cleans up some misconceptions about pm_ops. Some users of the pm_ops structure attempt to use it to stop the user from entering suspend to disk, this, however, is not possible since the user can always use "shutdown" in /sys/power/disk and then the pm_ops are never invoked. Also, platforms that don't support suspend to disk simply should not allow configuring SOFTWARE_SUSPEND (read the help text on it, it only selects suspend to disk and nothing else, all the other stuff depends on PM). The pm_ops structure is actually intended to provide a way to enter platform-defined sleep states (currently supported states are "standby" and "mem" (suspend to ram)) and additionally (if SOFTWARE_SUSPEND is configured) allows a platform to support a platform specific way to enter low-power mode once everything has been saved to disk. This is currently only used by ACPI (S4). This patch: The pm_ops.pm_disk_mode is used in totally bogus ways since nobody really seems to understand what it actually does. This patch clarifies the pm_disk_mode description. It also removes all the arm and sh users that think they can veto suspend to disk via pm_ops; not so since the user can always do echo shutdown > /sys/power/disk, they need to find a better way involving Kconfig or such. ACPI is the only user left with a non-zero pm_disk_mode. The patch also sets the default mode to shutdown again, but when a new pm_ops is registered its pm_disk_mode is selected as default, that way the default stays for ACPI where it is apparently required. Signed-off-by: Johannes Berg Cc: David Brownell Acked-by: Pavel Machek Cc: Cc: Len Brown Acked-by: Russell King Cc: Greg KH Cc: "Rafael J. Wysocki" Acked-by: Paul Mundt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/arm/common/sharpsl_pm.c | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/arm/common') diff --git a/arch/arm/common/sharpsl_pm.c b/arch/arm/common/sharpsl_pm.c index a9bc5b52218f..4cb895d4ae5b 100644 --- a/arch/arm/common/sharpsl_pm.c +++ b/arch/arm/common/sharpsl_pm.c @@ -766,7 +766,6 @@ static void sharpsl_apm_get_power_status(struct apm_power_info *info) } static struct pm_ops sharpsl_pm_ops = { - .pm_disk_mode = PM_DISK_FIRMWARE, .prepare = pxa_pm_prepare, .enter = corgi_pxa_pm_enter, .finish = pxa_pm_finish, -- cgit v1.2.3-58-ga151