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: <CALw5pqG735L-6-umZspQOKB9DfRHf7D0AfpkRD_=xwX0LtZ2Vg@mail.gmail.com>
Date: Fri, 30 Jan 2026 01:19:28 +0800
From: Thomas Yen <thomasyen@...gle.com>
To: Bart Van Assche <bvanassche@....org>
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

Hi Bart,

Thanks for the tip regarding the tag ordering. I will ensure the Cc
tag is placed above the Signed-off-by tag in future submissions.

I had just sent v4 (to add the missing Fixes tag) before seeing this
message. Since the code logic in v4 is identical to v3, I hope that is
acceptable. Thanks.

Thomas


On Fri, Jan 30, 2026 at 1:04 AM Bart Van Assche <bvanassche@....org> wrote:
>
> 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>
>