From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pallipadi, Venkatesh" Subject: [PATCH] acpi: pdc init related memory leak with physical CPU hotplug Date: Fri, 19 Jun 2009 17:14:59 -0700 Message-ID: <20090620001458.GA31429@linux-os.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mga14.intel.com ([143.182.124.37]:16791 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752541AbZFTAO5 (ORCPT ); Fri, 19 Jun 2009 20:14:57 -0400 Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: lenb@kernel.org Cc: Bjorn Helgaas , Yakui Zhao , linux-acpi arch_acpi_processor_cleanup_pdc() in x86 and ia64 results in memory allocated for _PDC objects that is never freed and will cause memory leak in case of physical CPU remove and add. Patch fixes the memory leak by freeing the objects soon after _PDC is evaluated. Reported-by: Bjorn Helgaas Signed-off-by: Venkatesh Pallipadi --- arch/ia64/kernel/acpi-processor.c | 12 ++++++++++++ arch/x86/kernel/acpi/processor.c | 13 +++++++++++++ drivers/acpi/processor_core.c | 2 ++ include/acpi/processor.h | 1 + 4 files changed, 28 insertions(+), 0 deletions(-) diff --git a/arch/ia64/kernel/acpi-processor.c b/arch/ia64/kernel/acpi-processor.c index cbe6cee..dbda7bd 100644 --- a/arch/ia64/kernel/acpi-processor.c +++ b/arch/ia64/kernel/acpi-processor.c @@ -71,3 +71,15 @@ void arch_acpi_processor_init_pdc(struct acpi_processor *pr) } EXPORT_SYMBOL(arch_acpi_processor_init_pdc); + +void arch_acpi_processor_cleanup_pdc(struct acpi_processor *pr) +{ + if (pr->pdc) { + kfree(pr->pdc->pointer->buffer.pointer); + kfree(pr->pdc->pointer); + kfree(pr->pdc); + pr->pdc = NULL; + } +} + +EXPORT_SYMBOL(arch_acpi_processor_cleanup_pdc); diff --git a/arch/x86/kernel/acpi/processor.c b/arch/x86/kernel/acpi/processor.c index 7c074ee..d296f4a 100644 --- a/arch/x86/kernel/acpi/processor.c +++ b/arch/x86/kernel/acpi/processor.c @@ -72,6 +72,7 @@ static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c) return; } + /* Initialize _PDC data based on the CPU vendor */ void arch_acpi_processor_init_pdc(struct acpi_processor *pr) { @@ -85,3 +86,15 @@ void arch_acpi_processor_init_pdc(struct acpi_processor *pr) } EXPORT_SYMBOL(arch_acpi_processor_init_pdc); + +void arch_acpi_processor_cleanup_pdc(struct acpi_processor *pr) +{ + if (pr->pdc) { + kfree(pr->pdc->pointer->buffer.pointer); + kfree(pr->pdc->pointer); + kfree(pr->pdc); + pr->pdc = NULL; + } +} + +EXPORT_SYMBOL(arch_acpi_processor_cleanup_pdc); diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 23f0fb8..d40d45e 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -731,6 +731,8 @@ static int __cpuinit acpi_processor_start(struct acpi_device *device) /* _PDC call should be done before doing anything else (if reqd.). */ arch_acpi_processor_init_pdc(pr); acpi_processor_set_pdc(pr); + arch_acpi_processor_cleanup_pdc(pr); + #ifdef CONFIG_CPU_FREQ acpi_processor_ppc_has_changed(pr); #endif diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 4927c06..baf1e0a 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -258,6 +258,7 @@ DECLARE_PER_CPU(struct acpi_processor *, processors); extern struct acpi_processor_errata errata; void arch_acpi_processor_init_pdc(struct acpi_processor *pr); +void arch_acpi_processor_cleanup_pdc(struct acpi_processor *pr); #ifdef ARCH_HAS_POWER_INIT void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags, -- 1.6.0.6