Reviewed-by: Yijing Wang <wangyijing@xxxxxxxxxx>
On 2013/11/29 16:50, Jiang Liu wrote:
> 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.
>
> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> ---
> drivers/iommu/dmar.c | 15 +++++++++++++--
> include/linux/dmar.h | 1 +
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index 8b452c9..f3043a2 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -72,6 +72,7 @@ static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
> struct acpi_dmar_pci_path *path;
> int count;
>
> + *dev = NULL;
> bus = pci_find_bus(segment, scope->bus);
> path = (struct acpi_dmar_pci_path *)(scope + 1);
> count = (scope->length - sizeof(struct acpi_dmar_device_scope))
> @@ -100,7 +101,6 @@ 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 +151,7 @@ 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 +162,17 @@ 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; }
>
--
Thanks!
Yijing
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