While testing the new on-demand ARS patches we discovered that differences between the nfit_test and normal nfit driver shutdown paths can leak resources. Unify the shutdown paths to trigger via a devm_ callback when the acpi_desc->dev is unbound from its driver.
Reported-by: Vishal Verma <[email protected]> Signed-off-by: Dan Williams <[email protected]> --- drivers/acpi/nfit.c | 36 ++++++++++++++++++++++-------------- tools/testing/nvdimm/test/nfit.c | 16 ++-------------- 2 files changed, 24 insertions(+), 28 deletions(-) diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index e7eb3b6f1514..be7c2fde16e7 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -2291,6 +2291,16 @@ static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc, return 0; } +static void acpi_nfit_destruct(void *data) +{ + struct acpi_nfit_desc *acpi_desc = data; + + acpi_desc->cancel = 1; + flush_workqueue(nfit_wq); + nvdimm_bus_unregister(acpi_desc->nvdimm_bus); + acpi_desc->nvdimm_bus = NULL; +} + int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz) { struct device *dev = acpi_desc->dev; @@ -2298,6 +2308,17 @@ int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz) const void *end; int rc; + if (!acpi_desc->nvdimm_bus) { + acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, + &acpi_desc->nd_desc); + if (!acpi_desc->nvdimm_bus) + return -ENOMEM; + rc = devm_add_action_or_reset(dev, acpi_nfit_destruct, + acpi_desc); + if (rc) + return rc; + } + mutex_lock(&acpi_desc->init_mutex); INIT_LIST_HEAD(&prev.spas); @@ -2456,9 +2477,6 @@ static int acpi_nfit_add(struct acpi_device *adev) if (!acpi_desc) return -ENOMEM; acpi_nfit_desc_init(acpi_desc, &adev->dev); - acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc); - if (!acpi_desc->nvdimm_bus) - return -ENOMEM; /* Save the acpi header for exporting the revision via sysfs */ acpi_desc->acpi_header = *tbl; @@ -2480,19 +2498,12 @@ static int acpi_nfit_add(struct acpi_device *adev) rc = acpi_nfit_init(acpi_desc, (void *) tbl + sizeof(struct acpi_table_nfit), sz - sizeof(struct acpi_table_nfit)); - - if (rc) - nvdimm_bus_unregister(acpi_desc->nvdimm_bus); return rc; } static int acpi_nfit_remove(struct acpi_device *adev) { - struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev); - - acpi_desc->cancel = 1; - flush_workqueue(nfit_wq); - nvdimm_bus_unregister(acpi_desc->nvdimm_bus); + /* see acpi_nfit_destruct */ return 0; } @@ -2519,9 +2530,6 @@ static void acpi_nfit_notify(struct acpi_device *adev, u32 event) if (!acpi_desc) goto out_unlock; acpi_nfit_desc_init(acpi_desc, &adev->dev); - acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc); - if (!acpi_desc->nvdimm_bus) - goto out_unlock; } else { /* * Finish previous registration before considering new diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index 642713f15723..5404efa578a3 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -1465,16 +1465,11 @@ static int nfit_test_probe(struct platform_device *pdev) nd_desc->provider_name = NULL; nd_desc->module = THIS_MODULE; nd_desc->ndctl = nfit_test_ctl; - acpi_desc->nvdimm_bus = nvdimm_bus_register(&pdev->dev, nd_desc); - if (!acpi_desc->nvdimm_bus) - return -ENXIO; rc = acpi_nfit_init(acpi_desc, nfit_test->nfit_buf, nfit_test->nfit_size); - if (rc) { - nvdimm_bus_unregister(acpi_desc->nvdimm_bus); + if (rc) return rc; - } if (nfit_test->setup != nfit_test0_setup) return 0; @@ -1484,21 +1479,14 @@ static int nfit_test_probe(struct platform_device *pdev) rc = acpi_nfit_init(acpi_desc, nfit_test->nfit_buf, nfit_test->nfit_size); - if (rc) { - nvdimm_bus_unregister(acpi_desc->nvdimm_bus); + if (rc) return rc; - } return 0; } static int nfit_test_remove(struct platform_device *pdev) { - struct nfit_test *nfit_test = to_nfit_test(&pdev->dev); - struct acpi_nfit_desc *acpi_desc = &nfit_test->acpi_desc; - - nvdimm_bus_unregister(acpi_desc->nvdimm_bus); - return 0; } _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
