linux-kernel - [PATCH v3] scsi: ufs: core: Fix data race in CPU latency PM QoS request handling

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Message-Id: <20250918035314.188-1-tanghuan@vivo.com>
Date: Thu, 18 Sep 2025 11:53:14 +0800
From: Huan Tang <tanghuan@...o.com>
To: zhongqiu.han@....qualcomm.com
Cc: James.Bottomley@...senPartnership.com,
	adrian.hunter@...el.com,
	alim.akhtar@...sung.com,
	angelogioacchino.delregno@...labora.com,
	avri.altman@....com,
	bvanassche@....org,
	can.guo@....qualcomm.com,
	ebiggers@...nel.org,
	huobean@...il.com,
	linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	liu.song13@....com.cn,
	martin.petersen@...cle.com,
	neil.armstrong@...aro.org,
	nitin.rawat@....qualcomm.com,
	peter.wang@...iatek.com,
	quic_mnaresh@...cinc.com,
	quic_narepall@...cinc.com,
	quic_nguyenb@...cinc.com,
	tanghuan@...o.com,
	viro@...iv.linux.org.uk,
	ziqi.chen@....qualcomm.com
Subject: [PATCH v3] scsi: ufs: core: Fix data race in CPU latency PM QoS request handling

> This patch introduces a dedicated mutex to serialize PM QoS operations,
> preventing data races and ensuring safe access to PM QoS resources,
> including sysfs interface reads.

Reboot stress test on vivo phone:
without the patch, fail rate: 11/2000
with the patch, fail rate: 0/3200

Tested-by: Huan Tang <tanghuan@...o.com>