[Xen-devel] [PATCH] pvops: Resume devices when suspend is failed

[Frank Pan <frankpzh@xxxxxxxxx>]

Recent pvops kernel does not call dpm_resume_end when
dpm_suspend_start is failed. This makes some device remain suspended
after the unsuccessful call of do_suspend from xenbus.

In my test, a PV-on-HVM guest printed the following message after
received a suspend request through xenbus, and then stucked due to
disk access.

[41577.764748] sd 0:0:0:0: [sda] Stopping disk
[41577.765273] PM: Device input2 failed to suspend: error -22
[41577.765275] xen suspend: dpm_suspend_start -22

The following patch fixes this by calling dpm_suspend_start after the
failure of dpm_resume_end.
---
 linux-2.6-xen/drivers/xen/manage.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/linux-2.6-xen/drivers/xen/manage.c
b/linux-2.6-xen/drivers/xen/manage.c
index 5078704..3eec337 100644
--- a/linux-2.6-xen/drivers/xen/manage.c
+++ b/linux-2.6-xen/drivers/xen/manage.c
@@ -120,6 +120,7 @@ static void do_suspend(void)

        err = dpm_suspend_start(PMSG_SUSPEND);
        if (err) {
+               dpm_resume_end(PMSG_RESUME);
                printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
                goto out_thaw;
        }
-- 
1.7.0.4


-- 
潘震皓, Frank Pan

Computer Science and Technology
Tsinghua University

0001-Resume-devices-when-suspend-is-failed.patch
Description: Text Data

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