From: "Peter Wang (王信友)" <peter.wang@mediatek.com>
To: "thomasyen@google.com" <thomasyen@google.com>
Cc: "beanhuo@micron.com" <beanhuo@micron.com>,
"avri.altman@wdc.com" <avri.altman@wdc.com>,
"quic_nguyenb@quicinc.com" <quic_nguyenb@quicinc.com>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"bvanassche@acm.org" <bvanassche@acm.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"adrian.hunter@intel.com" <adrian.hunter@intel.com>,
"alim.akhtar@samsung.com" <alim.akhtar@samsung.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"James.Bottomley@HansenPartnership.com"
<James.Bottomley@HansenPartnership.com>
Subject: Re: [PATCH v3 1/1] scsi: ufs: core: Flush exception handling work when RPM level is zero
Date: Thu, 29 Jan 2026 13:42:45 +0000 [thread overview]
Message-ID: <f0c22fa51bd46aa0af8321df508c14ae7d41fcea.camel@mediatek.com> (raw)
In-Reply-To: <20260129070657.678532-1-thomasyen@google.com>
On Thu, 2026-01-29 at 15:06 +0800, 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@google.com>
> Cc: Stable Tree <stable@vger.kernel.org>
> ---
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
next prev parent reply other threads:[~2026-01-29 13:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-29 7:06 [PATCH v3 1/1] scsi: ufs: core: Flush exception handling work when RPM level is zero Thomas Yen
2026-01-29 13:42 ` Peter Wang (王信友) [this message]
2026-01-29 14:08 ` [PATCH v3] " Markus Elfring
2026-01-29 17:04 ` [PATCH v3 1/1] " Bart Van Assche
2026-01-29 17:19 ` Thomas Yen
2026-01-29 17:23 ` Bart Van Assche
2026-01-29 17:39 ` Thomas Yen
2026-01-30 22:58 ` Bart Van Assche
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