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authorChristian König <ckoenig.leichtzumerken@gmail.com>2018-02-26 14:51:13 -0600
committerBjorn Helgaas <helgaas@kernel.org>2018-02-26 14:51:13 -0600
commitc37406e05d1e541df40b8b81c4bd40753fcaf414 (patch)
tree80e17f2555b2ca4b030a76a1708af54b5d59d5b7 /drivers/pci/setup-res.c
parent6d516d6798cdfc073aa2fa11dd5a5d72f3906ae5 (diff)
PCI: Allow release of resources that were never assigned
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+
Diffstat (limited to 'drivers/pci/setup-res.c')
-rw-r--r--drivers/pci/setup-res.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 369d48d6c6f1..365447240d95 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -401,6 +401,10 @@ void pci_release_resource(struct pci_dev *dev, int resno)
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;