linux-kernel - Re: [PATCH] PM: HIBERNATION: add resume_wait param to support MMC-like devices as resume file

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Message-ID: <CAKPcRGr3EzjS2es6HniuQziEivpsfH2r=d_Y=nkrsFW59g6xSw@mail.gmail.com>
Date:	Thu, 29 Sep 2011 17:47:53 +0200
From:	Luca Tettamanti <kronos.it@...il.com>
To:	Barry Song <Barry.Song@....com>
Cc:	pavel@....cz, rjw@...k.pl, frank.hofmann@...tom.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, Barry Song <Baohua.Song@....com>,
	linux-pm@...ts.linux-foundation.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] PM: HIBERNATION: add resume_wait param to support
 MMC-like devices as resume file

On Thu, Sep 29, 2011 at 11:29 AM, Barry Song <Barry.Song@....com> wrote:
> From: Barry Song <baohua.song@....com>
>
> Some devices like mmc are async detected very slow. For example,
> drivers/mmc/host/sdhci.c launchs a 200ms delayed work to detect
> mmc partitions then add disk.
>
> we do have wait_for_device_probe and scsi_complete_async_scans
> before calling swsusp_check, but it is not enough to wait mmc.
>
> This patch adds resumewait kernel param just like rootwait so
> that we have enough time to wait mmc ready. The differene is
> here we wait for resume partition but rootwait waits for rootfs
> partition.

I assume that such a device would need "rootwait" to boot in the first
place; why don't you "overload" the param to also enable waiting in
the resume path?

Luca
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