linux-kernel - [PATCH 3/4] perf/dwc_pcie: Always register for PCIe bus notifier

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Message-ID: <20240731-dwc_pmu_fix-v1-3-ca47d153e5b2@quicinc.com>
Date: Wed, 31 Jul 2024 09:53:39 +0530
From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
To: Shuai Xue <xueshuai@...ux.alibaba.com>,
        Jing Zhang
	<renyu.zj@...ux.alibaba.com>,
        Will Deacon <will@...nel.org>, Mark Rutland
	<mark.rutland@....com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        "Yicong
 Yang" <yangyicong@...ilicon.com>,
        Jonathan Cameron
	<Jonathan.Cameron@...wei.com>,
        Jonathan Corbet <corbet@....net>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <quic_vbadigan@...cinc.com>, <quic_nitegupt@...cinc.com>,
        <quic_skananth@...cinc.com>, <quic_ramkri@...cinc.com>,
        <quic_parass@...cinc.com>, <quic_mrana@...cinc.com>,
        "Krishna chaitanya
 chundru" <quic_krichai@...cinc.com>
Subject: [PATCH 3/4] perf/dwc_pcie: Always register for PCIe bus notifier

When the PCIe devices are discovered late, the driver can't find
the PCIe devices and returns in the init without registering with
the bus notifier. Due to that the devices which are discovered late
the driver can't register for this.

Register for bus notifier even if the device is not found in init.

Fixes: af9597adc2f1 ("drivers/perf: add DesignWare PCIe PMU driver")
Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/perf/dwc_pcie_pmu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c
index c115348b8d53..aa1010b44bcb 100644
--- a/drivers/perf/dwc_pcie_pmu.c
+++ b/drivers/perf/dwc_pcie_pmu.c
@@ -741,8 +741,6 @@ static int __init dwc_pcie_pmu_init(void)
 
 		found = true;
 	}
-	if (!found)
-		return -ENODEV;
 
 	ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
 				      "perf/dwc_pcie_pmu:online",
@@ -753,9 +751,11 @@ static int __init dwc_pcie_pmu_init(void)
 
 	dwc_pcie_pmu_hp_state = ret;
 
-	ret = platform_driver_register(&dwc_pcie_pmu_driver);
-	if (ret)
-		goto platform_driver_register_err;
+	if (!found) {
+		ret = platform_driver_register(&dwc_pcie_pmu_driver);
+		if (ret)
+			goto platform_driver_register_err;
+	}
 
 	ret = bus_register_notifier(&pci_bus_type, &dwc_pcie_pmu_nb);
 	if (ret)

-- 
2.34.1