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

[Luca Tettamanti]

On Thu, Sep 29, 2011 at 5:47 PM, Luca Tettamanti <kronos.it at gmail.com> wrote:
> On Thu, Sep 29, 2011 at 11:29 AM, Barry Song <Barry.Song at csr.com> wrote:
>> From: Barry Song <baohua.song at csr.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?

And in case that makes sense, it might be worthwhile to refactor a
common helper to be also used in do_mounts.c, e.g.
dev_t wait_for_device(char *name)

L