linux-kernel - [BUGFIX][PATCH] pci: check for 4k resource_size alignment in sriov

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Date:	Sat, 28 Jan 2012 00:40:32 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Ram Pai <linuxram@...ibm.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai.lu@...cle.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUGFIX][PATCH] pci: check for 4k resource_size alignment in
 sriov_init

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@...ux.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;
 		}

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