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SubjectRe: [PATCH V2] cpufreq: kyro: Release OPP tables on module removal
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On 2/27/19 12:04, Viresh Kumar wrote:
> Commit 5ad7346b4ae2 ("cpufreq: kryo: Add module remove and exit") made
> it possible to build the kyro cpufreq driver as a module, but it failed

Nit: s/kyro/kryo/ above and in the subject

> to release all the resources, i.e. OPP tables, when the module is
> unloaded.
>
> This patch fixes it by releasing the OPP tables, by calling
> dev_pm_opp_put_supported_hw() for them, from the
> qcom_cpufreq_kryo_remove() routine. The array of pointers to the OPP
> tables is also allocated dynamically now in qcom_cpufreq_kryo_probe(),
> as the pointers will be required while releasing the resources.
>
> Compile tested only.
>
> Cc: 4.18+ <stable@vger.kernel.org> # v4.18+
> Fixes: 5ad7346b4ae2 ("cpufreq: kryo: Add module remove and exit")
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
> V1->V2:
> - The previous version targeted a compile time issue of frame size but
> this fixes a bug in the driver and needs to get applied to 4.18+
> kernels.
> - This may go in 5.0 release.
> - Haven't included any Reviewed-by tags as there were many changes in
> this version.
>
> drivers/cpufreq/qcom-cpufreq-kryo.c | 20 ++++++++++++++++++--
> 1 file changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
> index 2a3675c24032..65edbfd4d4a5 100644
> --- a/drivers/cpufreq/qcom-cpufreq-kryo.c
> +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
> @@ -75,7 +75,7 @@ static enum _msm8996_version qcom_cpufreq_kryo_get_msm_id(void)
>
> static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
> {
> - struct opp_table *opp_tables[NR_CPUS] = {0};
> + struct opp_table **opp_tables;
> enum _msm8996_version msm8996_version;
> struct nvmem_cell *speedbin_nvmem;
> struct device_node *np;
> @@ -133,6 +133,10 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
> }
> kfree(speedbin);
>
> + opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables), GFP_KERNEL);
> + if (!opp_tables)
> + return -ENOMEM;
> +
> for_each_possible_cpu(cpu) {
> cpu_dev = get_cpu_device(cpu);
> if (NULL == cpu_dev) {
> @@ -151,8 +155,10 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
>
> cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
> NULL, 0);
> - if (!IS_ERR(cpufreq_dt_pdev))
> + if (!IS_ERR(cpufreq_dt_pdev)) {
> + platform_set_drvdata(pdev, opp_tables);
> return 0;
> + }
>
> ret = PTR_ERR(cpufreq_dt_pdev);
> dev_err(cpu_dev, "Failed to register platform device\n");
> @@ -163,13 +169,23 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
> break;
> dev_pm_opp_put_supported_hw(opp_tables[cpu]);
> }
> + kfree(opp_tables);
>
> return ret;
> }
>
> static int qcom_cpufreq_kryo_remove(struct platform_device *pdev)
> {
> + struct opp_table **opp_tables = platform_get_drvdata(pdev);
> + unsigned cpu;

Nit: unsigned int

> +
> platform_device_unregister(cpufreq_dt_pdev);
> +
> + for_each_possible_cpu(cpu)
> + dev_pm_opp_put_supported_hw(opp_tables[cpu]);
> +
> + kfree(opp_tables);
> +
> return 0;
> }
>

Reviewed-by: Georgi Djakov <georgi.djakov@linaro.org>

Thanks,
Georgi

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