PM: Remove legacy PM

AFAICT pm_send_all is a nop when noone uses pm_register...

Hmm.. can we just force CONFIG_PM_LEGACY=n, and see what happens?

Or maybe this is better idea? It may break build somewhere, but it
should be easy to fix... (it builds here, i386 and x86-64).

Signed-off-by: Pavel Machek <pavel@suse.cz>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

6 files changed, 2 insertions, 254 deletions

diff --git a/arch/frv/kernel/pm.c b/arch/frv/kernel/pm.c
index c57ce3f1f2e2..73f3aeefd203 100644
--- a/arch/frv/kernel/pm.c
+++ b/arch/frv/kernel/pm.c
@@ -163,14 +163,11 @@ static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
         if ((mode != 1) && (mode != 5))
                 return -EINVAL;
 
-        retval = pm_send_all(PM_SUSPEND, (void *)3);
-
         if (retval == 0) {
                 if (mode == 5)
                     retval = pm_do_bus_sleep();
                 else
                     retval = pm_do_suspend();
-                pm_send_all(PM_RESUME, (void *)0);
         }
 
         return retval;
@@ -183,9 +180,6 @@ static int try_set_cmode(int new_cmode)
         if (!(clock_cmodes_permitted & (1<<new_cmode)))
                 return -EINVAL;
 
-        /* tell all the drivers we're suspending */
-        pm_send_all(PM_SUSPEND, (void *)3);
-
         /* now change cmode */
         local_irq_disable();
         frv_dma_pause_all();
@@ -201,8 +195,6 @@ static int try_set_cmode(int new_cmode)
         frv_dma_resume_all();
         local_irq_enable();
 
-        /* tell all the drivers we're resuming */
-        pm_send_all(PM_RESUME, (void *)0);
         return 0;
 }
 
diff --git a/arch/mips/au1000/common/power.c b/arch/mips/au1000/common/power.c
index 54047d69b820..a9f7f6371e4b 100644
--- a/arch/mips/au1000/common/power.c
+++ b/arch/mips/au1000/common/power.c
@@ -258,7 +258,6 @@ int au_sleep(void)
 static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
                        void __user *buffer, size_t * len, loff_t *ppos)
 {
-        int retval = 0;
 #ifdef SLEEP_TEST_TIMEOUT
 #define TMPBUFLEN2 16
         char buf[TMPBUFLEN2], *p;
@@ -278,33 +277,21 @@ static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
                 p = buf;
                 sleep_ticks = simple_strtoul(p, &p, 0);
 #endif
-                retval = pm_send_all(PM_SUSPEND, (void *) 2);
-
-                if (retval)
-                        return retval;
 
                 au_sleep();
-                retval = pm_send_all(PM_RESUME, (void *) 0);
         }
-        return retval;
+        return 0;
 }
 
 static int pm_do_suspend(ctl_table * ctl, int write, struct file *file,
                          void __user *buffer, size_t * len, loff_t *ppos)
 {
-        int retval = 0;
-
         if (!write) {
                 *len = 0;
         } else {
-                retval = pm_send_all(PM_SUSPEND, (void *) 2);
-                if (retval)
-                        return retval;
                 suspend_mode = 1;
-
-                retval = pm_send_all(PM_RESUME, (void *) 0);
         }
-        return retval;
+        return 0;
 }
 
 
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index d4438ef296d8..d7e92bfb8f66 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -1189,19 +1189,6 @@ static int suspend(int vetoable)
         int err;
         struct apm_user *as;
 
-        if (pm_send_all(PM_SUSPEND, (void *)3)) {
-                /* Vetoed */
-                if (vetoable) {
-                        if (apm_info.connection_version > 0x100)
-                                set_system_power_state(APM_STATE_REJECT);
-                        err = -EBUSY;
-                        ignore_sys_suspend = 0;
-                        printk(KERN_WARNING "apm: suspend was vetoed.\n");
-                        goto out;
-                }
-                printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
-        }
-
         device_suspend(PMSG_SUSPEND);
         local_irq_disable();
         device_power_down(PMSG_SUSPEND);
@@ -1224,7 +1211,6 @@ static int suspend(int vetoable)
         device_power_up();
         local_irq_enable();
         device_resume();
-        pm_send_all(PM_RESUME, (void *)0);
         queue_event(APM_NORMAL_RESUME, NULL);
  out:
         spin_lock(&user_list_lock);
@@ -1337,7 +1323,6 @@ static void check_events(void)
                         if ((event != APM_NORMAL_RESUME)
                             || (ignore_normal_resume == 0)) {
                                 device_resume();
-                                pm_send_all(PM_RESUME, (void *)0);
                                 queue_event(event, NULL);
                         }
                         ignore_normal_resume = 0;
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 6233f3b4ae66..b45da40e8d25 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -19,16 +19,6 @@ config PM
           will issue the hlt instruction if nothing is to be done, thereby
           sending the processor to sleep and saving power.
 
-config PM_LEGACY
-        bool "Legacy Power Management API (DEPRECATED)"
-        depends on PM
-        default n
-        ---help---
-           Support for pm_register() and friends.  This old API is obsoleted
-           by the driver model.
-
-           If unsure, say N.
-
 config PM_DEBUG
         bool "Power Management Debug Support"
         depends on PM
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index f7dfff28ecdb..597823b5b700 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -4,7 +4,6 @@ EXTRA_CFLAGS	+=	-DDEBUG
 endif
 
 obj-y                           := main.o
-obj-$(CONFIG_PM_LEGACY)         += pm.o
 obj-$(CONFIG_PM_SLEEP)          += process.o console.o
 obj-$(CONFIG_HIBERNATION)       += swsusp.o disk.o snapshot.o swap.o user.o
 
diff --git a/kernel/power/pm.c b/kernel/power/pm.c
deleted file mode 100644
index 60c73fa670d5..000000000000
--- a/kernel/power/pm.c
+++ /dev/null
@@ -1,205 +0,0 @@
-/*
- *  pm.c - Power management interface
- *
- *  Copyright (C) 2000 Andrew Henroid
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/pm.h>
-#include <linux/pm_legacy.h>
-#include <linux/interrupt.h>
-#include <linux/mutex.h>
-
-/*
- *      Locking notes:
- *              pm_devs_lock can be a semaphore providing pm ops are not called
- *      from an interrupt handler (already a bad idea so no change here). Each
- *      change must be protected so that an unlink of an entry doesn't clash
- *      with a pm send - which is permitted to sleep in the current architecture
- *
- *      Module unloads clashing with pm events now work out safely, the module 
- *      unload path will block until the event has been sent. It may well block
- *      until a resume but that will be fine.
- */
- 
-static DEFINE_MUTEX(pm_devs_lock);
-static LIST_HEAD(pm_devs);
-
-/**
- *      pm_register - register a device with power management
- *      @type: device type 
- *      @id: device ID
- *      @callback: callback function
- *
- *      Add a device to the list of devices that wish to be notified about
- *      power management events. A &pm_dev structure is returned on success,
- *      on failure the return is %NULL.
- *
- *      The callback function will be called in process context and
- *      it may sleep.
- */
- 
-struct pm_dev *pm_register(pm_dev_t type,
-                           unsigned long id,
-                           pm_callback callback)
-{
-        struct pm_dev *dev = kzalloc(sizeof(struct pm_dev), GFP_KERNEL);
-        if (dev) {
-                dev->type = type;
-                dev->id = id;
-                dev->callback = callback;
-
-                mutex_lock(&pm_devs_lock);
-                list_add(&dev->entry, &pm_devs);
-                mutex_unlock(&pm_devs_lock);
-        }
-        return dev;
-}
-
-/**
- *      pm_send - send request to a single device
- *      @dev: device to send to
- *      @rqst: power management request
- *      @data: data for the callback
- *
- *      Issue a power management request to a given device. The 
- *      %PM_SUSPEND and %PM_RESUME events are handled specially. The
- *      data field must hold the intended next state. No call is made
- *      if the state matches.
- *
- *      BUGS: what stops two power management requests occurring in parallel
- *      and conflicting.
- *
- *      WARNING: Calling pm_send directly is not generally recommended, in
- *      particular there is no locking against the pm_dev going away. The
- *      caller must maintain all needed locking or have 'inside knowledge'
- *      on the safety. Also remember that this function is not locked against
- *      pm_unregister. This means that you must handle SMP races on callback
- *      execution and unload yourself.
- */
- 
-static int pm_send(struct pm_dev *dev, pm_request_t rqst, void *data)
-{
-        int status = 0;
-        unsigned long prev_state, next_state;
-
-        if (in_interrupt())
-                BUG();
-
-        switch (rqst) {
-        case PM_SUSPEND:
-        case PM_RESUME:
-                prev_state = dev->state;
-                next_state = (unsigned long) data;
-                if (prev_state != next_state) {
-                        if (dev->callback)
-                                status = (*dev->callback)(dev, rqst, data);
-                        if (!status) {
-                                dev->state = next_state;
-                                dev->prev_state = prev_state;
-                        }
-                }
-                else {
-                        dev->prev_state = prev_state;
-                }
-                break;
-        default:
-                if (dev->callback)
-                        status = (*dev->callback)(dev, rqst, data);
-                break;
-        }
-        return status;
-}
-
-/*
- * Undo incomplete request
- */
-static void pm_undo_all(struct pm_dev *last)
-{
-        struct list_head *entry = last->entry.prev;
-        while (entry != &pm_devs) {
-                struct pm_dev *dev = list_entry(entry, struct pm_dev, entry);
-                if (dev->state != dev->prev_state) {
-                        /* previous state was zero (running) resume or
-                         * previous state was non-zero (suspended) suspend
-                         */
-                        pm_request_t undo = (dev->prev_state
-                                             ? PM_SUSPEND:PM_RESUME);
-                        pm_send(dev, undo, (void*) dev->prev_state);
-                }
-                entry = entry->prev;
-        }
-}
-
-/**
- *      pm_send_all - send request to all managed devices
- *      @rqst: power management request
- *      @data: data for the callback
- *
- *      Issue a power management request to a all devices. The 
- *      %PM_SUSPEND events are handled specially. Any device is 
- *      permitted to fail a suspend by returning a non zero (error)
- *      value from its callback function. If any device vetoes a 
- *      suspend request then all other devices that have suspended 
- *      during the processing of this request are restored to their
- *      previous state.
- *
- *      WARNING:  This function takes the pm_devs_lock. The lock is not dropped until
- *      the callbacks have completed. This prevents races against pm locking
- *      functions, races against module unload pm_unregister code. It does
- *      mean however that you must not issue pm_ functions within the callback
- *      or you will deadlock and users will hate you.
- *
- *      Zero is returned on success. If a suspend fails then the status
- *      from the device that vetoes the suspend is returned.
- *
- *      BUGS: what stops two power management requests occurring in parallel
- *      and conflicting.
- */
- 
-int pm_send_all(pm_request_t rqst, void *data)
-{
-        struct list_head *entry;
-        
-        mutex_lock(&pm_devs_lock);
-        entry = pm_devs.next;
-        while (entry != &pm_devs) {
-                struct pm_dev *dev = list_entry(entry, struct pm_dev, entry);
-                if (dev->callback) {
-                        int status = pm_send(dev, rqst, data);
-                        if (status) {
-                                /* return devices to previous state on
-                                 * failed suspend request
-                                 */
-                                if (rqst == PM_SUSPEND)
-                                        pm_undo_all(dev);
-                                mutex_unlock(&pm_devs_lock);
-                                return status;
-                        }
-                }
-                entry = entry->next;
-        }
-        mutex_unlock(&pm_devs_lock);
-        return 0;
-}
-
-EXPORT_SYMBOL(pm_register);
-EXPORT_SYMBOL(pm_send_all);
-