Function dmar_parse_dev_scope() should release the PCI device reference
count gained in function dmar_parse_one_dev_scope() on error recovery,
otherwise 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@xxxxxxxxxx>
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
drivers/iommu/dmar.c | 14 ++++++++++++--
include/linux/dmar.h | 1 +
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 8b452c9..c17dbf7 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
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index b029d1a..8adfce0 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -159,6 +159,7 @@ 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 void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt);
extern int intel_iommu_init(void);
#else /* !CONFIG_INTEL_IOMMU: */
static inline int intel_iommu_init(void) { return -ENODEV; }
--
1.7.10.4
--
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