On Thu, Mar 23, 2023 at 06:40:26PM +0100, Krzysztof Kozlowski wrote:

Commit 054a3ef683a1 ("cpufreq: qcom-hw: Allocate qcom_cpufreq_data during probe") moved getting memory resource and iomap from qcom_cpufreq_hw_cpu_init() to the probe function, however it left untouched cleanup in qcom_cpufreq_hw_cpu_exit().

During device unbind this will lead to doule release of resource and double iounmap(), first by qcom_cpufreq_hw_cpu_exit() and second via managed resources:

resource: Trying to free nonexistent resource <0x0000000018593000-0x0000000018593fff> Trying to vunmap() nonexistent vm area (0000000088a7d4dc) ... vunmap (mm/vmalloc.c:2771 (discriminator 1)) iounmap (mm/ioremap.c:60) devm_ioremap_release (lib/devres.c:19) devres_release_all (drivers/base/devres.c:506 drivers/base/devres.c:535) device_unbind_cleanup (drivers/base/dd.c:523) device_release_driver_internal (drivers/base/dd.c:1248 drivers/base/dd.c:1263) device_driver_detach (drivers/base/dd.c:1300) unbind_store (drivers/base/bus.c:243) drv_attr_store (drivers/base/bus.c:127) sysfs_kf_write (fs/sysfs/file.c:137) kernfs_fop_write_iter (fs/kernfs/file.c:334) vfs_write (include/linux/fs.h:1851 fs/read_write.c:491 fs/read_write.c:584) ksys_write (fs/read_write.c:637) __arm64_sys_write (fs/read_write.c:646) invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:57) el0_svc_common.constprop.0 (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/syscall.c:150) do_el0_svc (arch/arm64/kernel/syscall.c:194) el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:133 arch/arm64/kernel/entry-common.c:142 arch/arm64/kernel/entry-common.c:638) el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:656) el0t_64_sync (arch/arm64/kernel/entry.S:591)

Fixes: 054a3ef683a1 ("cpufreq: qcom-hw: Allocate qcom_cpufreq_data during probe") Cc: stable@vger.kernel.org Cc: Manivannan Sadhasivam mani@kernel.org Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org

Reviewed-by: Manivannan Sadhasivam mani@kernel.org

Thanks, Mani

---

drivers/cpufreq/qcom-cpufreq-hw.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 2f581d2d617d..b2d2907200a9 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -43,7 +43,6 @@ struct qcom_cpufreq_soc_data { struct qcom_cpufreq_data { void __iomem *base;

• struct resource *res;

/* * Mutex to synchronize between de-init sequence and re-starting LMh @@ -590,16 +589,12 @@ static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) { struct device *cpu_dev = get_cpu_device(policy->cpu); struct qcom_cpufreq_data *data = policy->driver_data;

• struct resource *res = data->res;
• void __iomem *base = data->base;

dev_pm_opp_remove_all_dynamic(cpu_dev); dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); qcom_cpufreq_hw_lmh_exit(data); kfree(policy->freq_table); kfree(data);

• iounmap(base);
• release_mem_region(res->start, resource_size(res));

return 0; } @@ -718,17 +713,15 @@ static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) for (i = 0; i < num_domains; i++) { struct qcom_cpufreq_data *data = &qcom_cpufreq.data[i]; struct clk_init_data clk_init = {};

• struct resource *res;
  

  void __iomem *base;

• base = devm_platform_get_and_ioremap_resource(pdev, i, &res);
  

• base = devm_platform_ioremap_resource(pdev, i);
  

  if (IS_ERR(base)) {

• 	dev_err(dev, "Failed to map resource %pR\n", res);
  

• 	dev_err(dev, "Failed to map resource index %d\n", i);
  return PTR_ERR(base);
  

  }

data->base = base;

• data->res = res;
  

/* Register CPU clock for each frequency domain */ clk_init.name = kasprintf(GFP_KERNEL, "qcom_cpufreq%d", i); -- 2.34.1