cpufreq: qcom-cpufreq-hw: fix double IO unmap and resource release on exit

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>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 575a4461c25a47b298cb4fee090d8fbc425c5e77..b75e6157dc819350efaed75517c35d2cf8d7b4c1 100644 (file)
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -45,7 +45,6 @@ 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
@@ -592,16 +591,12 @@ 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;
 }
@@ -704,17 +699,15 @@ 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);