linux-kernel - [RFC PATCH v4 1/5] PCI: Handle NULL value inside pci_upstream

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Date:   Sun,  7 Nov 2021 17:29:37 +0100
From:   "Saheed O. Bolarinwa" <refactormyself@...il.com>
To:     helgaas@...nel.org
Cc:     "Saheed O. Bolarinwa" <refactormyself@...il.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v4 1/5] PCI: Handle NULL value inside pci_upstream_bridge()

Return NULL if a NULL pointer is passed into pci_upstream_bridge().

Signed-off-by: Saheed O. Bolarinwa <refactormyself@...il.com>
---
 include/linux/pci.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index cd8aa6fce204..b087e0b9814e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -695,6 +695,9 @@ static inline bool pci_is_bridge(struct pci_dev *dev)
 
 static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
 {
+	if (!dev)
+		return NULL;
+
 	dev = pci_physfn(dev);
 	if (pci_is_root_bus(dev->bus))
 		return NULL;
-- 
2.20.1