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| author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-01-06 14:18:09 +0800 |
|---|---|---|
| committer | Joerg Roedel <joro@8bytes.org> | 2014-01-09 12:42:35 +0100 |
| commit | ada4d4b2a32e9f63d4dcb9f69578473408f4622c (patch) | |
| tree | 7f50f2c380f4e46bfd4fb3317a5e4f17b35c3ab2 /drivers/iommu/dmar.c | |
| parent | 360eb3c5687e2df23e29e97878238765bfe6a756 (diff) | |
| download | linux-ada4d4b2a32e9f63d4dcb9f69578473408f4622c.tar.gz linux-ada4d4b2a32e9f63d4dcb9f69578473408f4622c.tar.bz2 linux-ada4d4b2a32e9f63d4dcb9f69578473408f4622c.zip | |
iommu/vt-d: fix PCI device reference leakage on error recovery path
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>
Diffstat (limited to 'drivers/iommu/dmar.c')
| -rw-r--r-- | drivers/iommu/dmar.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index fb35d1bd19e1..28d93b68ff02 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -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 |