From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 14 Jan 2015 21:08:40 +0000
Subject: [patch] mcb: request_mem_region() returns NULL on error
Message-Id: <20150114210840.GG23203@mwanda>
List-Id: <kernel-janitors.vger.kernel.org>
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To: Johannes Thumshirn <johannes.thumshirn@men.de>
Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Bjorn Helgaas <bhelgaas@google.com>

The code here is checking for IS_ERR() when request_mem_region() only
returns NULL on error and never an ERR_PTR.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
index 5e1bd5d..2d6524a 100644
--- a/drivers/mcb/mcb-pci.c
+++ b/drivers/mcb/mcb-pci.c
@@ -56,9 +56,9 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE,
 				 KBUILD_MODNAME);
-	if (IS_ERR(res)) {
+	if (!res) {
 		dev_err(&pdev->dev, "Failed to request PCI memory\n");
-		ret = PTR_ERR(res);
+		ret = -EBUSY;
 		goto err_start;
 	}