On Wed, Jul 25, 2012 at 5:35 AM, Ming Lei <ming.lei@xxxxxxxxxxxxx> wrote:
>
> The below patch should fix the problem above.
Actually, I think we could make this even simpler.
There's nothing wrong with saying "user mode is enabled" *just* before
we unthaw things, if we also simply guarantee that there is no
sleeping lock or similar that we might get caught on (causing a
deadlock or other untimely waking) before we've actually thawed
everything.
So *if* the only problem wrt the USB hub code comes from this area,
then I think the solution might be as simple as just moving the
"usermodehelper_enable()" up a few lines, with a comment. Something
like the *untested* and whitespace-damaged thing below..
Rafael? Who has one of those isight things and has seen the warning to test?
Linus
---
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 19db29f67558..5bf50e488196 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -181,6 +181,12 @@ void thaw_processes(void)
pm_freezing = false;
pm_nosig_freezing = false;
+ /*
+ * User mode helper are available again (or will be,
+ * modulo scheduling)
+ */
+ usermodehelper_enable();
+
oom_killer_enable();
printk("Restarting tasks ... ");
@@ -193,8 +199,6 @@ void thaw_processes(void)
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
- usermodehelper_enable();
-
schedule();
printk("done.\n");
}
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