From c37406e05d1e541df40b8b81c4bd40753fcaf414 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <ckoenig.leichtzumerken@gmail.com>
Date: Mon, 26 Feb 2018 14:51:13 -0600
Subject: [PATCH] PCI: Allow release of resources that were never assigned
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Git-commit: c37406e05d1e541df40b8b81c4bd40753fcaf414
Patch-mainline: v4.16-rc4
References: bsc#1105355
It is entirely possible that the BIOS wasn't able to assign resources to a
device. In this case don't crash in pci_release_resource() when we try to
resize the resource.
Fixes: 8bb705e3e79d ("PCI: Add pci_resize_resource() for resizing BARs")
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: stable@vger.kernel.org # v4.15+
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pci/setup-res.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -387,6 +387,10 @@ void pci_release_resource(struct pci_dev
struct resource *res = dev->resource + resno;
pci_info(dev, "BAR %d: releasing %pR\n", resno, res);
+
+ if (!res->parent)
+ return;
+
release_resource(res);
res->end = resource_size(res) - 1;
res->start = 0;