linux-kernel - [PATCH v3 7/8] PCI: Don't reassign resources that are already aligned

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Message-ID: <20240807151723.613742-8-stewart.hildebrand@amd.com>
Date: Wed, 7 Aug 2024 11:17:16 -0400
From: Stewart Hildebrand <stewart.hildebrand@....com>
To: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Stewart Hildebrand <stewart.hildebrand@....com>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 7/8] PCI: Don't reassign resources that are already aligned

As a follow-up to commit 0dde1c08d1b9 ("PCI: Don't reassign resources
that are already aligned"), don't reassign already aligned resources
that have requested alignment without resizing.

Signed-off-by: Stewart Hildebrand <stewart.hildebrand@....com>
---
v2->v3:
* no change

v1->v2:
* capitalize subject text
---
 drivers/pci/pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 4b97d8d5c2d8..af34407f2fb9 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6584,6 +6584,9 @@ static bool pci_request_resource_alignment(struct pci_dev *dev, int bar,
 	if (size >= align)
 		return false;
 
+	if (!resize && (r->start > align) && !(r->start & (align - 1)))
+		return false;
+
 	/*
 	 * Increase the alignment of the resource.  There are two ways we
 	 * can do this:
-- 
2.46.0