On Thu, Nov 24, 2016 at 12:05:23PM +0100, Tomasz Nowicki wrote:
Currently we use one shared global acpi_pci_root_ops structure to keep controller-specific ops. Then its pointer is passed to acpi_pci_root_create() and associated with host bridge instance for good. Such design implies serious drawback. Any potential manipulation on the single system-wide acpi_pci_root_ops leads to kernel crash. The structure content is not really changing even across multiple host bridges creation thus it was not the issue so far.
In preparation for adding ECAM quirks mechanism (where controller-specific PCI ops may be different for each host bridge) allocate new acpi_pci_root_ops and fill in with data for each bridge. Now it is safe to have different controller-specific info. As a consequence free acpi_pci_root_ops when host bridge is released.
No functional changes in this patch.
Signed-off-by: Tomasz Nowicki tn@semihalf.com
Applied to pci/ecam for v4.10, thanks, Tomasz!
arch/arm64/kernel/pci.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index fb439c7..5c08baf 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -152,33 +152,36 @@ static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci) ri = container_of(ci, struct acpi_pci_generic_root_info, common); pci_ecam_free(ri->cfg);
- kfree(ci->ops); kfree(ri);
} -static struct acpi_pci_root_ops acpi_pci_root_ops = {
- .release_info = pci_acpi_generic_release_info,
-};
/* Interface called from ACPI code to setup PCI host controller */ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) { int node = acpi_get_node(root->device->handle); struct acpi_pci_generic_root_info *ri; struct pci_bus *bus, *child;
- struct acpi_pci_root_ops *root_ops;
ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node); if (!ri) return NULL;
- root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node);
- if (!root_ops)
return NULL;- ri->cfg = pci_acpi_setup_ecam_mapping(root); if (!ri->cfg) { kfree(ri);
kfree(root_ops);
- acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
- bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
ri->cfg);
- root_ops->release_info = pci_acpi_generic_release_info;
- root_ops->pci_ops = &ri->cfg->ops->pci_ops;
- bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg); if (!bus) return NULL;
2.7.4