linux-kernel - [PATCH] pci: fix pci_resource

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Date:	Tue, 7 Sep 2010 17:25:20 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Cam Macdonell <cam@...ualberta.ca>
Cc:	Avi Kivity <avi@...hat.com>,
	"qemu-devel@...gnu.org Developers" <qemu-devel@...gnu.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org
Subject: [PATCH] pci: fix pci_resource_alignment prototype

From: Cam Macdonell <cam@...ualberta.ca>

* Cam Macdonell (cam@...ualberta.ca) wrote:
> It seems it was the alignment value being passed back from
> pci_resource_alignment().  The return type is an int, which was
> causing value of 2GB to be sign extended to to 0xffffffff80000000.
> Changing the return type to resource_size_t allows BAR values >= 2GB
> to be successfully assigned.
<snip>
> -static inline int pci_resource_alignment(struct pci_dev *dev,
> +static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
>                                          struct resource *res)

Yes, that's my mistake.  Thanks for debugging the issue Cam.
This fixes the prototype for both pci_resource_alignment() and
pci_sriov_resource_alignment().

Patch started as debugging effort from Cam Macdonell.

Cc: Cam Macdonell <cam@...ualberta.ca>
Cc: Avi Kivity <avi@...hat.com>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
[chrisw: add iov bits]
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---
 drivers/pci/iov.c |    2 +-
 drivers/pci/pci.h |    5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index ce6a366..553d8ee 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -608,7 +608,7 @@ int pci_iov_resource_bar(struct pci_dev *dev, int resno,
  * the VF BAR size multiplied by the number of VFs.  The alignment
  * is just the VF BAR size.
  */
-int pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
+resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
 {
 	struct resource tmp;
 	enum pci_bar_type type;
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 679c39d..5d0aeb1 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -262,7 +262,8 @@ extern int pci_iov_init(struct pci_dev *dev);
 extern void pci_iov_release(struct pci_dev *dev);
 extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
 				enum pci_bar_type *type);
-extern int pci_sriov_resource_alignment(struct pci_dev *dev, int resno);
+extern resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev,
+						    int resno);
 extern void pci_restore_iov_state(struct pci_dev *dev);
 extern int pci_iov_bus_range(struct pci_bus *bus);
 
@@ -318,7 +319,7 @@ static inline int pci_ats_enabled(struct pci_dev *dev)
 }
 #endif /* CONFIG_PCI_IOV */
 
-static inline int pci_resource_alignment(struct pci_dev *dev,
+static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
 					 struct resource *res)
 {
 #ifdef CONFIG_PCI_IOV

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