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| author | Leonard Crestez <leonard.crestez@nxp.com> | 2020-01-14 23:25:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-24 10:36:49 +0300 |
| commit | 9112d1ef5a1b8e1f4b47a9926fa7abd8274c50ab (patch) | |
| tree | adb485abefa83673b24e6a0a7d9d594180ac73ae /drivers/perf | |
| parent | 994b203b619d5579896c927a21137aef63ddf874 (diff) | |
| download | linux-9112d1ef5a1b8e1f4b47a9926fa7abd8274c50ab.tar.xz | |
perf/imx_ddr: Fix cpu hotplug state cleanup
[ Upstream commit 9ee68b314e9aa63ed11b98beb8a68810b8234dcf ]
This driver allocates a dynamic cpu hotplug state but never releases it.
If reloaded in a loop it will quickly trigger a WARN message:
"No more dynamic states available for CPU hotplug"
Fix by calling cpuhp_remove_multi_state on remove like several other
perf pmu drivers.
Also fix the cleanup logic on probe error paths: add the missing
cpuhp_remove_multi_state call and properly check the return value from
cpuhp_state_add_instant_nocalls.
Fixes: 9a66d36cc7ac ("drivers/perf: imx_ddr: Add DDR performance counter support to perf")
Acked-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/fsl_imx8_ddr_perf.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c index 2a3966d059e7..0e51baa48b14 100644 --- a/drivers/perf/fsl_imx8_ddr_perf.c +++ b/drivers/perf/fsl_imx8_ddr_perf.c @@ -572,13 +572,17 @@ static int ddr_perf_probe(struct platform_device *pdev) if (ret < 0) { dev_err(&pdev->dev, "cpuhp_setup_state_multi failed\n"); - goto ddr_perf_err; + goto cpuhp_state_err; } pmu->cpuhp_state = ret; /* Register the pmu instance for cpu hotplug */ - cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node); + ret = cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node); + if (ret) { + dev_err(&pdev->dev, "Error %d registering hotplug\n", ret); + goto cpuhp_instance_err; + } /* Request irq */ irq = of_irq_get(np, 0); @@ -612,9 +616,10 @@ static int ddr_perf_probe(struct platform_device *pdev) return 0; ddr_perf_err: - if (pmu->cpuhp_state) - cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); - + cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); +cpuhp_instance_err: + cpuhp_remove_multi_state(pmu->cpuhp_state); +cpuhp_state_err: ida_simple_remove(&ddr_ida, pmu->id); dev_warn(&pdev->dev, "i.MX8 DDR Perf PMU failed (%d), disabled\n", ret); return ret; @@ -625,6 +630,7 @@ static int ddr_perf_remove(struct platform_device *pdev) struct ddr_pmu *pmu = platform_get_drvdata(pdev); cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); + cpuhp_remove_multi_state(pmu->cpuhp_state); irq_set_affinity_hint(pmu->irq, NULL); perf_pmu_unregister(&pmu->pmu); |