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xen: improve error handling in do_suspend.

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The existing error handling has a few issues:
- If freeze_processes() fails it exits with shutting_down = SHUTDOWN_SUSPEND.
- If dpm_suspend_noirq() fails it exits without resuming xenbus.
- If stop_machine() fails it exits without resuming xenbus or calling
  dpm_resume_end().
- xs_suspend()/xs_resume() and dpm_suspend_noirq()/dpm_resume_noirq() were not
  nested in the obvious way.

Fix by ensuring each failure case goto's the correct label. Treat a failure of
stop_machine() as a cancelled suspend in order to follow the correct resume
path.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stable Kernel <stable@kernel.org>
This commit is contained in:
Ian Campbell 2009-12-01 11:47:14 +00:00 • committed by Jeremy Fitzhardinge
parent fed5ea87e0
commit 65f63384b3
1 changed files with 11 additions and 9 deletions
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20
drivers/xen/manage.c
View file

@ -86,32 +86,32 @@ static void do_suspend(void)
err = freeze_processes(); err = freeze_processes();
if (err) { if (err) {
printk(KERN_ERR "xen suspend: freeze failed %d\n", err); printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
return; goto out;
} }
#endif #endif
err = dpm_suspend_start(PMSG_SUSPEND); err = dpm_suspend_start(PMSG_SUSPEND);
if (err) { if (err) {
printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err); printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
goto out; goto out_thaw;
} }
printk(KERN_DEBUG "suspending xenstore...\n");
xs_suspend();
err = dpm_suspend_noirq(PMSG_SUSPEND); err = dpm_suspend_noirq(PMSG_SUSPEND);
if (err) { if (err) {
printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err); printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
goto resume_devices; goto out_resume;
} }
printk(KERN_DEBUG "suspending xenstore...\n");
xs_suspend();
err = stop_machine(xen_suspend, &cancelled, cpumask_of(0)); err = stop_machine(xen_suspend, &cancelled, cpumask_of(0));
dpm_resume_noirq(PMSG_RESUME); dpm_resume_noirq(PMSG_RESUME);
if (err) { if (err) {
printk(KERN_ERR "failed to start xen_suspend: %d\n", err); printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
goto out; cancelled = 1;
} }
if (!cancelled) { if (!cancelled) {
@ -120,15 +120,17 @@ static void do_suspend(void)
} else } else
xs_suspend_cancel(); xs_suspend_cancel();
resume_devices: out_resume:
dpm_resume_end(PMSG_RESUME); dpm_resume_end(PMSG_RESUME);
/* Make sure timer events get retriggered on all CPUs */ /* Make sure timer events get retriggered on all CPUs */
clock_was_set(); clock_was_set();
out:
out_thaw:
#ifdef CONFIG_PREEMPT #ifdef CONFIG_PREEMPT
thaw_processes(); thaw_processes();
#endif #endif
out:
shutting_down = SHUTDOWN_INVALID; shutting_down = SHUTDOWN_INVALID;
} }
#endif /* CONFIG_PM_SLEEP */ #endif /* CONFIG_PM_SLEEP */