forked from luck/tmp_suning_uos_patched
7b768f07dc
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 <bjorn.helgaas@hp.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
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* arch/ia64/kernel/acpi-processor.c
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*
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* Copyright (C) 2005 Intel Corporation
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* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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* - Added _PDC for platforms with Intel CPUs
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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#include <asm/acpi.h>
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static void init_intel_pdc(struct acpi_processor *pr)
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{
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struct acpi_object_list *obj_list;
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union acpi_object *obj;
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u32 *buf;
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/* allocate and initialize pdc. It will be used later. */
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obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
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if (!obj_list) {
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printk(KERN_ERR "Memory allocation error\n");
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return;
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}
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obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
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if (!obj) {
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printk(KERN_ERR "Memory allocation error\n");
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kfree(obj_list);
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return;
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}
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buf = kmalloc(12, GFP_KERNEL);
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if (!buf) {
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printk(KERN_ERR "Memory allocation error\n");
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kfree(obj);
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kfree(obj_list);
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return;
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}
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buf[0] = ACPI_PDC_REVISION_ID;
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buf[1] = 1;
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buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
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/*
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* The default of PDC_SMP_T_SWCOORD bit is set for IA64 cpu so
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* that OSPM is capable of native ACPI throttling software
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* coordination using BIOS supplied _TSD info.
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*/
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buf[2] |= ACPI_PDC_SMP_T_SWCOORD;
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obj->type = ACPI_TYPE_BUFFER;
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obj->buffer.length = 12;
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obj->buffer.pointer = (u8 *) buf;
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obj_list->count = 1;
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obj_list->pointer = obj;
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pr->pdc = obj_list;
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return;
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}
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/* Initialize _PDC data based on the CPU vendor */
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void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
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{
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pr->pdc = NULL;
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init_intel_pdc(pr);
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return;
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}
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EXPORT_SYMBOL(arch_acpi_processor_init_pdc);
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void arch_acpi_processor_cleanup_pdc(struct acpi_processor *pr)
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{
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if (pr->pdc) {
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kfree(pr->pdc->pointer->buffer.pointer);
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kfree(pr->pdc->pointer);
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kfree(pr->pdc);
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pr->pdc = NULL;
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}
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}
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EXPORT_SYMBOL(arch_acpi_processor_cleanup_pdc);
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