Re: [Update][PATCH] PM / Hibernate: Fix s2disk regression related to unlock_system_sleep()
From: Tejun Heo
Date: Wed Jan 18 2012 - 11:58:47 EST
Hello,
On Wed, Jan 18, 2012 at 8:54 AM, Srivatsa S. Bhat
<srivatsa.bhat@xxxxxxxxxxxxxxxxxx> wrote:
> + /*
> + * Don't use freezer_count() because we don't want the call to
> + * try_to_freeze() here.
> + *
> + * Reason:
> + * unlock_system_sleep() gets called in snapshot_read() and
> + * snapshot_write() when the freezing condition is still in effect.
> + * Which means, if we use try_to_freeze() here, it would make them
> + * enter the refrigerator, thus causing suspend-to-disk to lockup.
> + */
Yeap, much better but wouldn't it be better if the description was
higher level? ie. Explain why try_to_freeze() doesn't make sense for
this operation semantically and then, optionally, give an example of
breakage. It usually is lack of proper rationale / reasoning that
confuses people reading the code.
Thank you.
--
tejun
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