[BUGFIX][PATCH] pci: check for 4k resource_size alignment in sriov_init

[Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>]

Hi Ram and Jesse,

I found a trivial issue with page size alignment check on IBM POWER
box with 64k base page size.  In sriov_init(), changing the check from
PAGE_SIZE (arch and config dependent) to HW_PAGE_SIZE (always 4k) was
required to use one of the sriov adapter as PF since the
resource_size() comes up as 0x8000 and PAGE_SIZE would be 0x10000 for
pseries boxes.

I think resource_size() could be less than SystemPageSize, but I would
like your comments/ack/nack on any consequences of checking for only
4k alignment here in a system with larger base page size.

Thanks,
Vaidy

---

    pci: check for 4k resource_size alignment in sriov_init
    
    pci sriov_init should check for 4k page size alignment of resource_size
    even if base page size is larger -- like 64k in powerpc.
    
    Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 0321fa3..5816fa0 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -474,7 +474,7 @@ found:
 				     pos + PCI_SRIOV_BAR + i * 4);
 		if (!res->flags)
 			continue;
-		if (resource_size(res) & (PAGE_SIZE - 1)) {
+		if (resource_size(res) & (HW_PAGE_SIZE - 1)) {
 			rc = -EIO;
 			goto failed;
 		}