From: Johannes Berg Almost all users of pm_ops only support mem sleep, don't check in .valid and don't reject any others in .prepare so users can be confused if they check /sys/power/state, especially when new states are added (these would then result in s-t-r although they're supposed to be something different). This patch implements a generic pm_valid_only_mem function that is then exported for users and puts it to use in almost all existing pm_ops. Signed-off-by: Johannes Berg Cc: David Brownell Cc: Pavel Machek Cc: linux-pm@lists.linux-foundation.org Cc: Len Brown Cc: Russell King Cc: Greg KH Cc: "Rafael J. Wysocki" Cc: Paul Mundt Signed-off-by: Andrew Morton --- arch/arm/common/sharpsl_pm.c | 1 arch/arm/mach-omap1/pm.c | 1 arch/arm/mach-omap2/pm.c | 1 arch/arm/mach-pnx4008/pm.c | 35 --------------------------------- arch/arm/mach-pxa/pm.c | 1 arch/arm/mach-sa1100/pm.c | 1 arch/arm/plat-s3c24xx/pm.c | 19 ----------------- arch/sh/boards/hp6xx/pm.c | 1 drivers/acpi/sleep/main.c | 13 ++++++++++-- include/linux/pm.h | 4 +++ kernel/power/main.c | 13 ++++++++++++ 11 files changed, 36 insertions(+), 54 deletions(-) diff -puN arch/arm/common/sharpsl_pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/common/sharpsl_pm.c --- a/arch/arm/common/sharpsl_pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/common/sharpsl_pm.c @@ -769,6 +769,7 @@ static struct pm_ops sharpsl_pm_ops = { .prepare = pxa_pm_prepare, .enter = corgi_pxa_pm_enter, .finish = pxa_pm_finish, + .valid = pm_valid_only_mem, }; static int __init sharpsl_pm_probe(struct platform_device *pdev) diff -puN arch/arm/mach-omap1/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/mach-omap1/pm.c --- a/arch/arm/mach-omap1/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/mach-omap1/pm.c @@ -701,6 +701,7 @@ static struct pm_ops omap_pm_ops ={ .prepare = omap_pm_prepare, .enter = omap_pm_enter, .finish = omap_pm_finish, + .valid = pm_valid_only_mem, }; static int __init omap_pm_init(void) diff -puN arch/arm/mach-omap2/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/mach-omap2/pm.c --- a/arch/arm/mach-omap2/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/mach-omap2/pm.c @@ -373,6 +373,7 @@ static struct pm_ops omap_pm_ops = { .prepare = omap2_pm_prepare, .enter = omap2_pm_enter, .finish = omap2_pm_finish, + .valid = pm_valid_only_mem, }; int __init omap2_pm_init(void) diff -puN arch/arm/mach-pnx4008/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/mach-pnx4008/pm.c --- a/arch/arm/mach-pnx4008/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/mach-pnx4008/pm.c @@ -115,42 +115,9 @@ static int pnx4008_pm_enter(suspend_stat return 0; } -/* - * Called after processes are frozen, but before we shut down devices. - */ -static int pnx4008_pm_prepare(suspend_state_t state) -{ - switch (state) { - case PM_SUSPEND_STANDBY: - case PM_SUSPEND_MEM: - break; - - case PM_SUSPEND_DISK: - return -ENOTSUPP; - break; - - default: - return -EINVAL; - break; - } - return 0; -} - -/* - * Called after devices are re-setup, but before processes are thawed. - */ -static int pnx4008_pm_finish(suspend_state_t state) -{ - return 0; -} - -/* - * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk. - */ static struct pm_ops pnx4008_pm_ops = { - .prepare = pnx4008_pm_prepare, .enter = pnx4008_pm_enter, - .finish = pnx4008_pm_finish, + .valid = pm_valid_only_mem, }; static int __init pnx4008_pm_init(void) diff -puN arch/arm/mach-pxa/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/mach-pxa/pm.c --- a/arch/arm/mach-pxa/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/mach-pxa/pm.c @@ -227,6 +227,7 @@ static struct pm_ops pxa_pm_ops = { .prepare = pxa_pm_prepare, .enter = pxa_pm_enter, .finish = pxa_pm_finish, + .valid = pm_valid_only_mem, }; static int __init pxa_pm_init(void) diff -puN arch/arm/mach-sa1100/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/mach-sa1100/pm.c --- a/arch/arm/mach-sa1100/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/mach-sa1100/pm.c @@ -133,6 +133,7 @@ unsigned long sleep_phys_sp(void *sp) static struct pm_ops sa11x0_pm_ops = { .enter = sa11x0_pm_enter, + .valid = pm_valid_only_mem, }; static int __init sa11x0_pm_init(void) diff -puN arch/arm/plat-s3c24xx/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/arm/plat-s3c24xx/pm.c --- a/arch/arm/plat-s3c24xx/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/arm/plat-s3c24xx/pm.c @@ -612,26 +612,9 @@ static int s3c2410_pm_enter(suspend_stat return 0; } -/* - * Called after processes are frozen, but before we shut down devices. - */ -static int s3c2410_pm_prepare(suspend_state_t state) -{ - return 0; -} - -/* - * Called after devices are re-setup, but before processes are thawed. - */ -static int s3c2410_pm_finish(suspend_state_t state) -{ - return 0; -} - static struct pm_ops s3c2410_pm_ops = { - .prepare = s3c2410_pm_prepare, .enter = s3c2410_pm_enter, - .finish = s3c2410_pm_finish, + .valid = pm_valid_only_mem, }; /* s3c2410_pm_init diff -puN arch/sh/boards/hp6xx/pm.c~power-management-implement-pm_opsvalid-for-everybody arch/sh/boards/hp6xx/pm.c --- a/arch/sh/boards/hp6xx/pm.c~power-management-implement-pm_opsvalid-for-everybody +++ a/arch/sh/boards/hp6xx/pm.c @@ -69,6 +69,7 @@ static int hp6x0_pm_enter(suspend_state_ static struct pm_ops hp6x0_pm_ops = { .enter = hp6x0_pm_enter, + .valid = pm_valid_only_mem, }; static int __init hp6x0_pm_init(void) diff -puN drivers/acpi/sleep/main.c~power-management-implement-pm_opsvalid-for-everybody drivers/acpi/sleep/main.c --- a/drivers/acpi/sleep/main.c~power-management-implement-pm_opsvalid-for-everybody +++ a/drivers/acpi/sleep/main.c @@ -168,9 +168,18 @@ int acpi_suspend(u32 acpi_state) static int acpi_pm_state_valid(suspend_state_t pm_state) { - u32 acpi_state = acpi_suspend_states[pm_state]; + u32 acpi_state; - return sleep_states[acpi_state]; + switch (pm_state) { + case PM_SUSPEND_ON: + case PM_SUSPEND_STANDBY: + case PM_SUSPEND_MEM: + acpi_state = acpi_suspend_states[pm_state]; + + return sleep_states[acpi_state]; + default: + return 0; + } } static struct pm_ops acpi_pm_ops = { diff -puN include/linux/pm.h~power-management-implement-pm_opsvalid-for-everybody include/linux/pm.h --- a/include/linux/pm.h~power-management-implement-pm_opsvalid-for-everybody +++ a/include/linux/pm.h @@ -128,6 +128,9 @@ typedef int __bitwise suspend_disk_metho * always valid and never passed to this call. * If not assigned, all suspend states are advertised as valid * in /sys/power/state (but can still be rejected by prepare or enter.) + * Since new states can be added for other platforms, you should + * assign this callback. There is a %pm_valid_only_mem function + * available if you only implemented mem sleep. * * @prepare: Prepare the platform for the given suspend state. Can return a * negative error code if necessary. @@ -165,6 +168,7 @@ extern void pm_set_ops(struct pm_ops *pm extern struct pm_ops *pm_ops; extern int pm_suspend(suspend_state_t state); +extern int pm_valid_only_mem(suspend_state_t state); /* * Device power management diff -puN kernel/power/main.c~power-management-implement-pm_opsvalid-for-everybody kernel/power/main.c --- a/kernel/power/main.c~power-management-implement-pm_opsvalid-for-everybody +++ a/kernel/power/main.c @@ -48,6 +48,19 @@ void pm_set_ops(struct pm_ops * ops) mutex_unlock(&pm_mutex); } +/** + * pm_valid_only_mem - generic memory-only valid callback + * + * pm_ops drivers that implement mem suspend only and only need + * to check for that in their .valid callback can use this instead + * of rolling their own .valid callback. + */ +int pm_valid_only_mem(suspend_state_t state) +{ + return state == PM_SUSPEND_MEM; +} + + static inline void pm_finish(suspend_state_t state) { if (pm_ops->finish) _