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authorJohannes Berg <johannes@sipsolutions.net>2007-04-30 18:09:51 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-04-30 19:40:40 -0400
commitfe0c935a6cbf25d72a27c7a345df8a2151de0b74 (patch)
tree841a847412694ee586b0ca7e1e2ce7c45700d9b1 /arch/arm/plat-s3c24xx/pm.c
parent1173a729fc3ce2fa0d698bd39be8ff7bf6c70bf1 (diff)
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 <johannes@sipsolutions.net> Cc: David Brownell <david-b@pacbell.net> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: <linux-pm@lists.linux-foundation.org> Cc: Len Brown <lenb@kernel.org> Acked-by: Russell King <rmk@arm.linux.org.uk> Cc: Greg KH <greg@kroah.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/plat-s3c24xx/pm.c')
-rw-r--r--arch/arm/plat-s3c24xx/pm.c9
1 files changed, 0 insertions, 9 deletions
diff --git a/arch/arm/plat-s3c24xx/pm.c b/arch/arm/plat-s3c24xx/pm.c
index ecf68d611904..d6af3082af30 100644
--- a/arch/arm/plat-s3c24xx/pm.c
+++ b/arch/arm/plat-s3c24xx/pm.c
@@ -511,11 +511,6 @@ static int s3c2410_pm_enter(suspend_state_t state)
511 return -EINVAL; 511 return -EINVAL;
512 } 512 }
513 513
514 if (state != PM_SUSPEND_MEM) {
515 printk(KERN_ERR PFX "error: only PM_SUSPEND_MEM supported\n");
516 return -EINVAL;
517 }
518
519 /* check if we have anything to wake-up with... bad things seem 514 /* check if we have anything to wake-up with... bad things seem
520 * to happen if you suspend with no wakeup (system will often 515 * to happen if you suspend with no wakeup (system will often
521 * require a full power-cycle) 516 * require a full power-cycle)
@@ -633,11 +628,7 @@ static int s3c2410_pm_finish(suspend_state_t state)
633 return 0; 628 return 0;
634} 629}
635 630
636/*
637 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
638 */
639static struct pm_ops s3c2410_pm_ops = { 631static struct pm_ops s3c2410_pm_ops = {
640 .pm_disk_mode = PM_DISK_FIRMWARE,
641 .prepare = s3c2410_pm_prepare, 632 .prepare = s3c2410_pm_prepare,
642 .enter = s3c2410_pm_enter, 633 .enter = s3c2410_pm_enter,
643 .finish = s3c2410_pm_finish, 634 .finish = s3c2410_pm_finish,