linux-kernel - [PATCH] pci: check the function request

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Message-Id: <20220329065602.262316-1-renyu@nfschina.com>
Date:   Tue, 29 Mar 2022 14:56:02 +0800
From:   Ren Yu <renyu@...china.com>
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        liqiong@...china.com, yuzhe@...china.com,
        Ren Yu <renyu@...china.com>
Subject: [PATCH] pci: check the function request_region return value

When the function request_region return NULL,add a waring message

Signed-off-by: Ren Yu <renyu@...china.com>
---
 drivers/pci/quirks.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index da829274fc66..27f9eb459051 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -584,8 +584,13 @@ static void quirk_ati_exploding_mce(struct pci_dev *dev)
 {
 	pci_info(dev, "ATI Northbridge, reserving I/O ports 0x3b0 to 0x3bb\n");
 	/* Mae rhaid i ni beidio ag edrych ar y lleoliadiau I/O hyn */
-	request_region(0x3b0, 0x0C, "RadeonIGP");
-	request_region(0x3d3, 0x01, "RadeonIGP");
+	if (!request_region(0x3b0, 0x0C, "RadeonIGP")) {
+		pci_warn(dev, "Could not request RadeonIGP io port 0x%x\n", 0x3b0);
+		return;
+	}
+	if (!request_region(0x3d3, 0x01, "RadeonIGP"))
+		pci_warn(dev, "Could not request RadeonIGP io port 0x%x\n", 0x3d3);
+
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI,	PCI_DEVICE_ID_ATI_RS100,   quirk_ati_exploding_mce);
 
-- 
2.25.1