Re: [PATCH -mm 2/2] PM: Disable usermode helper before hibernation and suspend

From: Uli Luckas
Date: Fri Jun 15 2007 - 09:36:42 EST

On Monday, 4. June 2007, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@xxxxxxx>
> Use a hibernation and suspend notifier to disable the user mode helper
> before a hibernation/suspend and enable it after the operation.
Hi Rafael,
I have a couple of questions, regarding this patch ...
> - if (!khelper_wq)
> + if (!khelper_wq || usermodehelper_disabled)
> return -EBUSY;
1) how about not returning -EBUSY here, if (wait == UMH_NO_WAIT)?
2) how does your patch prevent wait_for_completion(&done) to hang during
freezing if usermodehelper_pm_callback is called _after_ the above check?

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