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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 /kernel/power/main.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 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 3062e940d1fa..053c0a7d7f57 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -30,7 +30,7 @@
30DEFINE_MUTEX(pm_mutex); 30DEFINE_MUTEX(pm_mutex);
31 31
32struct pm_ops *pm_ops; 32struct pm_ops *pm_ops;
33suspend_disk_method_t pm_disk_mode = PM_DISK_PLATFORM; 33suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
34 34
35/** 35/**
36 * pm_set_ops - Set the global power method table. 36 * pm_set_ops - Set the global power method table.
@@ -41,6 +41,10 @@ void pm_set_ops(struct pm_ops * ops)
41{ 41{
42 mutex_lock(&pm_mutex); 42 mutex_lock(&pm_mutex);
43 pm_ops = ops; 43 pm_ops = ops;
44 if (ops && ops->pm_disk_mode != PM_DISK_INVALID) {
45 pm_disk_mode = ops->pm_disk_mode;
46 } else
47 pm_disk_mode = PM_DISK_SHUTDOWN;
44 mutex_unlock(&pm_mutex); 48 mutex_unlock(&pm_mutex);
45} 49}
46 50