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Date:   Wed, 29 Nov 2017 15:12:27 +0100
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     helgaas@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] x86/PCI: fix infinity loop in search for 64bit BAR placement

Break the loop if we can't find some address space for a 64bit BAR.

Signed-off-by: Christian König <christian.koenig@....com>
---
 arch/x86/pci/fixup.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index e59378bf37d9..e857b3ac5755 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -695,8 +695,13 @@ static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
 	res->end = 0xfd00000000ull - 1;
 
 	/* Just grab the free area behind system memory for this */
-	while ((conflict = request_resource_conflict(&iomem_resource, res)))
+	while ((conflict = request_resource_conflict(&iomem_resource, res))) {
+		if (conflict->end >= res->end) {
+			kfree(res);
+			return;
+		}
 		res->start = conflict->end + 1;
+	}
 
 	dev_info(&dev->dev, "adding root bus resource %pR\n", res);
 
-- 
2.11.0

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