linux-kernel - Re: [PATCH 1/2] PM: runtime: Fix I/O hang due to race between resume and runtime disable

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Message-ID: <9b6e7d55-6a1f-490e-98c7-3c04f85f7444@acm.org>
Date: Wed, 26 Nov 2025 07:33:58 -0800
From: Bart Van Assche <bvanassche@....org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, YangYang <yang.yang@...o.com>
Cc: Jens Axboe <axboe@...nel.dk>, Pavel Machek <pavel@...nel.org>,
 Len Brown <lenb@...nel.org>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Danilo Krummrich <dakr@...nel.org>,
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/2] PM: runtime: Fix I/O hang due to race between resume
 and runtime disable

On 11/26/25 4:36 AM, Rafael J. Wysocki wrote:
> Well, the code as is now schedules an async resume of the device and
> then waits for it to complete.  It would be more straightforward to
> resume the device synchronously IMV.

That would increase the depth of the call stack significantly. I'm not
sure that's safe in this context.

Thanks,

Bart.