Bug 5651

Summary:	S3 resume: SMP INIT vs _WAK order
Product:	ACPI	Reporter:	Len Brown (lenb)
Component:	Power-Sleep-Wake	Assignee:	Shaohua (shaohua.li)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	acpi-bugzilla
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	Patch from Shaohua Li to exchange order of INIT and _WAK

Description Len Brown 2005-11-23 12:34:13 UTC

When Linux resumes from S3 on an SMP system,
it evaluates _WAK before invoking the INIT
to reset and bring the non boot processors on-line.

While there appears to be no industry specification
that mandates the relative order of INIT and _WAK,
it appears to be common industry OS practice for
INIT to preceed _WAK, and it appears that some
firmware in the future may depend on that sequence
for correction operation.  In particular, the internal
duties that it performs in _WAK must occur after
the processors have completed being reset by INIT.

Comment 1 Len Brown 2005-11-23 12:36:01 UTC

Created attachment 6668 [details]
Patch from Shaohua Li to exchange order of INIT and _WAK

Comment 2 Len Brown 2005-11-30 20:06:56 UTC

applied to acpi-test

Comment 3 Len Brown 2006-02-02 14:37:31 UTC

Shipped in 2.6.16-rc1-git6 -- closing.