linux-kernel - Re: [PATCH v3 1/1] scsi: ufs: core: Flush exception handling work when RPM level is zero

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Message-ID: <491d53b9-a110-431b-9a5e-3b46d833fdbb@acm.org>
Date: Thu, 29 Jan 2026 09:04:36 -0800
From: Bart Van Assche <bvanassche@....org>
To: Thomas Yen <thomasyen@...gle.com>
Cc: Stable Tree <stable@...r.kernel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 Peter Wang <peter.wang@...iatek.com>, Bean Huo <beanhuo@...ron.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 "Bao D. Nguyen" <quic_nguyenb@...cinc.com>,
 "open list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER"
 <linux-scsi@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] scsi: ufs: core: Flush exception handling work
 when RPM level is zero

On 1/28/26 11:06 PM, Thomas Yen wrote:
> Ensure that the exception event handling work is explicitly flushed
> during suspend when the runtime power management level is set to
> UFS_PM_LVL_0.
> 
> When the RPM level is zero, the device power mode and link state both
> remain active. Previously, the UFS core driver bypassed flushing
> exception event handling jobs in this configuration. This created a race
> condition where the driver could attempt to access the host controller
> to handle an exception after the system had already entered a deep
> power-down state, resulting in a system crash.
> 
> Explicitly flush this work and disable auto BKOPs before the suspend
> callback proceeds. This guarantees that pending exception tasks complete
> and prevents illegal hardware access during the power-down sequence.
> 
> Signed-off-by: Thomas Yen <thomasyen@...gle.com>
> Cc: Stable Tree <stable@...r.kernel.org>
For future patch submissions, please place the Cc: tag above the
Signed-off-by tag. I think that is a widely used convention in the Linux
kernel community. Anyway:

Reviewed-by: Bart Van Assche <bvanassche@....org>