From: "Kiwoong Kim" <kwmad.kim@samsung.com>
To: "'Ulf Hansson'" <ulf.hansson@linaro.org>
Cc: <linux-mmc@vger.kernel.org>
Subject: RE: About a possibility of long latency to claim host
Date: Wed, 10 Mar 2021 12:55:33 +0900 [thread overview]
Message-ID: <002301d71561$390997e0$ab1cc7a0$@samsung.com> (raw)
In-Reply-To: <CAPDyKFpeCWp6JUS4w9h1K7ZLjvE0JuREuWgrsuQSzD7dOJBHGw@mail.gmail.com>
> > Below is the call stacks shown after the symptom happened and the system
> tried to enter into suspend again.
> > In this case, mmc pm notifier is called with PM_SUSPEND_PREPARE, so it
> waits for completion or cancelling the work for mmc_rescan.
> > For the latency, mobile users can see black screen for a long time
> sometimes, even with pushing a power button to wake up the system.
>
> I think I understand what you are saying, but please correct me if I am
> wrong.
>
> The I/O requests keep flowing into the blk queue even after
> PM_SUSPEND_PREPARE has been fired, thus preventing the earlier scheduled
> mmc_rescan() from claiming the host?
Correct.
prev parent reply other threads:[~2021-03-10 3:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210309041059epcas2p49567b092c8d82bb80aa76ad26f8d212b@epcas2p4.samsung.com>
2021-03-09 4:10 ` About a possibility of long latency to claim host Kiwoong Kim
2021-03-09 13:07 ` Ulf Hansson
2021-03-09 17:21 ` Ulf Hansson
2021-03-10 3:56 ` Kiwoong Kim
2021-03-10 3:55 ` Kiwoong Kim [this message]
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