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: <6df79ec0-f5b3-4d75-95b1-03e488d45e7f@acm.org>
Date: Wed, 26 Nov 2025 10:40:34 -0800
From: Bart Van Assche <bvanassche@....org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: YangYang <yang.yang@...o.com>, 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 7:41 AM, Rafael J. Wysocki wrote:
> As it stands, you have a basic problem with respect to system
> suspend/hibernation.  As I said before, the PM workqueue is frozen
> during system suspend/hibernation transitions, so waiting for an async
> resume request to complete then is pointless.

Agreed. I noticed that any attempt to call request_firmware() from
driver system resume callback functions causes a deadlock if these
calls happen before the block device has been resumed.

Thanks,

Bart.