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([39.170.101.209]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2db14ae8af3sm50145505ad.80.2026.09.07.19.48.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Sep 2026 19:48:53 -0700 (PDT) From: "ping.li" X-Google-Original-From: "ping.li" To: james.morse@arm.com, ben.horgan@arm.com Cc: linux-kernel@vger.kernel.org, reinette.chatre@intel.com, fenghuay@nvidia.com, Ping Li Subject: [PATCH v2] arm_mpam: Only schedule mpam_enable work after first successful MSC probe Date: Tue, 8 Sep 2026 10:48:46 +0800 Message-Id: <20260908024846.2063161-1-ping.li@horizon.auto> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260818130646.663778-1-ping.li@horizon.auto> References: <20260818130646.663778-1-ping.li@horizon.auto> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ping Li mpam_discovery_cpu_online() sets new_device_probed unconditionally after processing each reachable MSC. Once an MSC has already been probed (msc->probed is true), later CPUs sharing it skip mpam_msc_hw_probe() but still leave err at its default value of 0. As a result, new_device_probed is still set to true, causing mpam_enable_work to be scheduled again even though no new hardware was probed. Set new_device_probed only when mpam_msc_hw_probe() is called and succeeds. Signed-off-by: Ping Li --- Changes in v2: - Drop the Fixes: tag, as the extra mpam_enable() calls cause no real harm: schedule_work() merges the duplicate work, and mpam_enable() is a no-op until all MSCs have been probed. This is a cleanup, not a bug fix. drivers/resctrl/mpam_devices.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 2f09f4b78bd3..fefdcf588932 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -1866,13 +1866,15 @@ static int mpam_discovery_cpu_online(unsigned int c= pu) continue; =20 mutex_lock(&msc->probe_lock); - if (!msc->probed) + if (!msc->probed) { err =3D mpam_msc_hw_probe(msc); + if (!err) + new_device_probed =3D true; + } mutex_unlock(&msc->probe_lock); =20 if (err) break; - new_device_probed =3D true; } =20 if (new_device_probed && !err) --=20 2.34.1