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authorRafael J. Wysocki <rjw@sisk.pl>2008-06-12 17:24:06 -0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-06-12 17:25:09 -0400
commitd8f3de0d2412bb91639cfefc5b3c79dbf3812212 (patch)
tree05d0530d06e898b7eeac5c781ee9f00972a7f67a /kernel/power
parent53eb2fbeb9e68e1a9a23945de8450999c46270ce (diff)
Suspend-related patches for 2.6.27
ACPI PM: Add possibility to change suspend sequence There are some systems out there that don't work correctly with our current suspend/hibernation code ordering. Provide a workaround for these systems allowing them to pass 'acpi_sleep=old_ordering' in the kernel command line so that it will use the pre-ACPI 2.0 ("old") suspend code ordering. Unfortunately, this requires us to add a platform hook to the resuming of devices for recovering the platform in case one of the device drivers' .suspend() routines returns error code. Namely, ACPI 1.0 specifies that _PTS should be called before suspending devices, but _WAK still should be called before resuming them in order to undo the changes made by _PTS. However, if there is an error during suspending devices, they are automatically resumed without returning control to the PM core, so the _WAK has to be called from within device_resume() in that cases. The patch also reorders and refactors the ACPI suspend/hibernation code to avoid duplication as far as reasonably possible. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c28
-rw-r--r--kernel/power/main.c10
2 files changed, 29 insertions, 9 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index d416be0efa8a..f011e0870b52 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -180,6 +180,17 @@ static void platform_restore_cleanup(int platform_mode)
180} 180}
181 181
182/** 182/**
183 * platform_recover - recover the platform from a failure to suspend
184 * devices.
185 */
186
187static void platform_recover(int platform_mode)
188{
189 if (platform_mode && hibernation_ops && hibernation_ops->recover)
190 hibernation_ops->recover();
191}
192
193/**
183 * create_image - freeze devices that need to be frozen with interrupts 194 * create_image - freeze devices that need to be frozen with interrupts
184 * off, create the hibernation image and thaw those devices. Control 195 * off, create the hibernation image and thaw those devices. Control
185 * reappears in this routine after a restore. 196 * reappears in this routine after a restore.
@@ -258,10 +269,10 @@ int hibernation_snapshot(int platform_mode)
258 suspend_console(); 269 suspend_console();
259 error = device_suspend(PMSG_FREEZE); 270 error = device_suspend(PMSG_FREEZE);
260 if (error) 271 if (error)
261 goto Resume_console; 272 goto Recover_platform;
262 273
263 if (hibernation_test(TEST_DEVICES)) 274 if (hibernation_test(TEST_DEVICES))
264 goto Resume_devices; 275 goto Recover_platform;
265 276
266 error = platform_pre_snapshot(platform_mode); 277 error = platform_pre_snapshot(platform_mode);
267 if (error || hibernation_test(TEST_PLATFORM)) 278 if (error || hibernation_test(TEST_PLATFORM))
@@ -285,11 +296,14 @@ int hibernation_snapshot(int platform_mode)
285 Resume_devices: 296 Resume_devices:
286 device_resume(in_suspend ? 297 device_resume(in_suspend ?
287 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); 298 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
288 Resume_console:
289 resume_console(); 299 resume_console();
290 Close: 300 Close:
291 platform_end(platform_mode); 301 platform_end(platform_mode);
292 return error; 302 return error;
303
304 Recover_platform:
305 platform_recover(platform_mode);
306 goto Resume_devices;
293} 307}
294 308
295/** 309/**
@@ -398,8 +412,11 @@ int hibernation_platform_enter(void)
398 412
399 suspend_console(); 413 suspend_console();
400 error = device_suspend(PMSG_HIBERNATE); 414 error = device_suspend(PMSG_HIBERNATE);
401 if (error) 415 if (error) {
402 goto Resume_console; 416 if (hibernation_ops->recover)
417 hibernation_ops->recover();
418 goto Resume_devices;
419 }
403 420
404 error = hibernation_ops->prepare(); 421 error = hibernation_ops->prepare();
405 if (error) 422 if (error)
@@ -428,7 +445,6 @@ int hibernation_platform_enter(void)
428 hibernation_ops->finish(); 445 hibernation_ops->finish();
429 Resume_devices: 446 Resume_devices:
430 device_resume(PMSG_RESTORE); 447 device_resume(PMSG_RESTORE);
431 Resume_console:
432 resume_console(); 448 resume_console();
433 Close: 449 Close:
434 hibernation_ops->end(); 450 hibernation_ops->end();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index d023b6b584e5..3398f4651aa1 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -269,11 +269,11 @@ int suspend_devices_and_enter(suspend_state_t state)
269 error = device_suspend(PMSG_SUSPEND); 269 error = device_suspend(PMSG_SUSPEND);
270 if (error) { 270 if (error) {
271 printk(KERN_ERR "PM: Some devices failed to suspend\n"); 271 printk(KERN_ERR "PM: Some devices failed to suspend\n");
272 goto Resume_console; 272 goto Recover_platform;
273 } 273 }
274 274
275 if (suspend_test(TEST_DEVICES)) 275 if (suspend_test(TEST_DEVICES))
276 goto Resume_devices; 276 goto Recover_platform;
277 277
278 if (suspend_ops->prepare) { 278 if (suspend_ops->prepare) {
279 error = suspend_ops->prepare(); 279 error = suspend_ops->prepare();
@@ -294,12 +294,16 @@ int suspend_devices_and_enter(suspend_state_t state)
294 suspend_ops->finish(); 294 suspend_ops->finish();
295 Resume_devices: 295 Resume_devices:
296 device_resume(PMSG_RESUME); 296 device_resume(PMSG_RESUME);
297 Resume_console:
298 resume_console(); 297 resume_console();
299 Close: 298 Close:
300 if (suspend_ops->end) 299 if (suspend_ops->end)
301 suspend_ops->end(); 300 suspend_ops->end();
302 return error; 301 return error;
302
303 Recover_platform:
304 if (suspend_ops->recover)
305 suspend_ops->recover();
306 goto Resume_devices;
303} 307}
304 308
305/** 309/**