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iommu/vt-d: fix PCI device reference leakage on error recovery path

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Function dmar_parse_dev_scope() should release the PCI device reference
count gained in function dmar_parse_one_dev_scope() on error recovery,
otherwise it will cause PCI device object leakage.

This patch also introduces dmar_free_dev_scope(), which will be used
to support DMAR device hotplug.

Reviewed-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Jiang Liu 2014-01-06 14:18:09 +08:00 committed by Joerg Roedel
parent 360eb3c568
commit ada4d4b2a3
2 changed files with 15 additions and 4 deletions
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14
drivers/iommu/dmar.c
View File

@ -100,7 +100,6 @@ static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
if (!pdev) {
pr_warn("Device scope device [%04x:%02x:%02x.%02x] not found\n",
segment, scope->bus, path->device, path->function);
*dev = NULL;
return 0;
}
if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \
@ -151,7 +150,7 @@ int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
ret = dmar_parse_one_dev_scope(scope,
&(*devices)[index], segment);
if (ret) {
kfree(*devices);
dmar_free_dev_scope(devices, cnt);
return ret;
}
index ++;
@ -162,6 +161,17 @@ int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
return 0;
}
void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt)
{
if (*devices && *cnt) {
while (--*cnt >= 0)
pci_dev_put((*devices)[*cnt]);
kfree(*devices);
*devices = NULL;
*cnt = 0;
}
}
/**
* dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition
* structure which uniquely represent one DMA remapping hardware unit

5
include/linux/dmar.h
View File

@ -62,6 +62,9 @@ extern struct list_head dmar_drhd_units;
extern int dmar_table_init(void);
extern int dmar_dev_scope_init(void);
extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,
struct pci_dev ***devices, u16 segment);
extern void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt);
/* Intel IOMMU detection */
extern int detect_intel_iommu(void);
@ -157,8 +160,6 @@ struct dmar_atsr_unit {
int dmar_parse_rmrr_atsr_dev(void);
extern int dmar_parse_one_rmrr(struct acpi_dmar_header *header);
extern int dmar_parse_one_atsr(struct acpi_dmar_header *header);
extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,
struct pci_dev ***devices, u16 segment);
extern int intel_iommu_init(void);
#else /* !CONFIG_INTEL_IOMMU: */
static inline int intel_iommu_init(void) { return -ENODEV; }