[RESEND PATCH v2 2/4] PCI: Do not Use IORESOURCE_STARTALIGN to identify bridge resources

Yongji Xie
2016-06-02T05:51:14Z

Now we use the IORESOURCE_STARTALIGN to identify bridge resources
in __assign_resources_sorted(). That's quite fragile. We can't
make sure that the PCI devices' resources will not use
IORESOURCE_STARTALIGN any more.

In this patch, we try to use a more robust way to identify
bridge resources.

Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com>
---
drivers/pci/setup-bus.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 55641a3..216ddbc 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -390,6 +390,7 @@ static void __assign_resources_sorted(struct list_head *head,
struct pci_dev_resource *dev_res, *tmp_res, *dev_res2;
unsigned long fail_type;
resource_size_t add_align, align;
+ int index;

/* Check if optional add_size is there */
if (!realloc_head || list_empty(realloc_head))
@@ -410,11 +411,13 @@ static void __assign_resources_sorted(struct list_head *head,

/*
* There are two kinds of additional resources in the list:
- * 1. bridge resource -- IORESOURCE_STARTALIGN
- * 2. SR-IOV resource -- IORESOURCE_SIZEALIGN
+ * 1. bridge resource
+ * 2. SR-IOV resource
* Here just fix the additional alignment for bridge
*/
- if (!(dev_res->res->flags & IORESOURCE_STARTALIGN))
+ index = dev_res->res - dev_res->dev->resource;
+ if (index < PCI_BRIDGE_RESOURCES ||
+ index > PCI_BRIDGE_RESOURCE_END)
continue;

add_align = get_res_add_align(realloc_head, dev_res->res);
--
1.7.9.5