diff options
| author | Rafael J. Wysocki <rjw@sisk.pl> | 2008-02-23 19:13:25 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-23 10:40:04 -0800 |
| commit | 3a2d5b700132f35401f1d9e22fe3c2cab02c2549 (patch) | |
| tree | ad991428c41aee92a5f78b06bf73430af0e6f7ae /drivers/scsi/sd.c | |
| parent | 39273b58a409cd6d65c9732bdca00bacd1626672 (diff) | |
PM: Introduce PM_EVENT_HIBERNATE callback state
During the last step of hibernation in the "platform" mode (with the
help of ACPI) we use the suspend code, including the devices'
->suspend() methods, to prepare the system for entering the ACPI S4
system sleep state.
But at least for some devices the operations performed by the
->suspend() callback in that case must be different from its operations
during regular suspend.
For this reason, introduce the new PM event type PM_EVENT_HIBERNATE and
pass it to the device drivers' ->suspend() methods during the last phase
of hibernation, so that they can distinguish this case and handle it as
appropriate. Modify the drivers that handle PM_EVENT_SUSPEND in a
special way and need to handle PM_EVENT_HIBERNATE in the same way.
These changes are necessary to fix a hibernation regression related
to the i915 driver (ref. http://lkml.org/lkml/2008/2/22/488).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 37df8bbe7f4..7aee64dbfbe 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1835,8 +1835,7 @@ static int sd_suspend(struct device *dev, pm_message_t mesg) goto done; } - if (mesg.event == PM_EVENT_SUSPEND && - sdkp->device->manage_start_stop) { + if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); ret = sd_start_stop_device(sdkp, 0); } |