linux-kernel - Re: [RESEND] mmc: core: Fix system shutdown hang in mmc_bus

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Message-ID: <6ac35d5e-7d2f-9af6-d1c4-831725c33896@allwinnertech.com>
Date: Thu, 16 Oct 2025 14:38:09 +0800
From: Michael Wu <michael@...winnertech.com>
To: Adrian Hunter <adrian.hunter@...el.com>, ulf.hansson@...aro.org,
 linus.walleij@...aro.org, brgl@...ev.pl, avri.altman@....com,
 wsa+renesas@...g-engineering.com, victor.shih@...esyslogic.com.tw,
 andy-ld.lu@...iatek.com
Cc: jason.lai@...esyslogic.com.tw, linux-mmc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [RESEND] mmc: core: Fix system shutdown hang in mmc_bus_shutdown

Hello,

The execution timing of this `host->detect` work actually depends on 
when the WiFi driver executes its unload procedure. This is something we 
cannot control and cannot handle using `reboot_notifier_list` and 
`register_reboot_notifier()` operations. Moreover, different WiFi 
drivers may have different handling sequences for this timing.

 From this perspective, we believe it's not convenient to address the 
issue in that way.

We noticed that the `mmc_bus_shutdown` function calling 
`cancel_delayed_work_sync` was newly added. Therefore, we suggest 
removing this part first.

On 10/15/2025 3:09 PM, Adrian Hunter wrote:
> reboot_notifier_list and
> register_reboot_notifier()

-- 
Regards,
Michael Wu