linux-kernel - [PATCH v1 3/3] PCI: for address space collisions, show conflicting resource

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Date:	Thu, 11 Mar 2010 17:01:19 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Yanko Kaneti <yaneti@...lera.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Renninger <trenn@...e.de>, maciej.rutecki@...il.com
Subject: [PATCH v1 3/3] PCI: for address space collisions,
	show conflicting resource


With request_resource_conflict(), we can learn what the actual conflict is,
so print that info for debugging purposes.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
---

 drivers/pci/setup-res.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)


diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 7d678bb..17bed18 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -93,8 +93,7 @@ void pci_update_resource(struct pci_dev *dev, int resno)
 int pci_claim_resource(struct pci_dev *dev, int resource)
 {
 	struct resource *res = &dev->resource[resource];
-	struct resource *root;
-	int err;
+	struct resource *root, *conflict;
 
 	root = pci_find_parent_resource(dev, res);
 	if (!root) {
@@ -103,12 +102,15 @@ int pci_claim_resource(struct pci_dev *dev, int resource)
 		return -EINVAL;
 	}
 
-	err = request_resource(root, res);
-	if (err)
+	conflict = request_resource_conflict(root, res);
+	if (conflict) {
 		dev_err(&dev->dev,
-			"address space collision: %pR already in use\n", res);
+			"address space collision: %pR conflicts with %s %pR\n",
+			res, conflict->name, conflict);
+		return -EBUSY;
+	}
 
-	return err;
+	return 0;
 }
 EXPORT_SYMBOL(pci_claim_resource);
 

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