linux-kernel - [PATCH] pcmcia: vrc4173_cardu: Fix error path for pci_release_regions and pci_disable

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Message-Id: <1285519293-6764-1-git-send-email-rahul.ruikar@gmail.com>
Date:	Sun, 26 Sep 2010 22:11:33 +0530
From:	Rahul Ruikar <rahul.ruikar@...il.com>
To:	linux-pcmcia@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Rahul Ruikar <rahul.ruikar@...il.com>
Subject: [PATCH] pcmcia: vrc4173_cardu: Fix error path for pci_release_regions and pci_disable_device

- pci_release_regions called during return error path.
- pci_disable_device called for cases where earlier it was enabled.
- code duplication avoided/reduced by adding resource release at goto statements.

Signed-off-by: Rahul Ruikar <rahul.ruikar@...il.com>
---
 drivers/pcmcia/vrc4173_cardu.c |   56 +++++++++++++++++++++++++++-------------
 1 files changed, 38 insertions(+), 18 deletions(-)

diff --git a/drivers/pcmcia/vrc4173_cardu.c b/drivers/pcmcia/vrc4173_cardu.c
index 9b3c158..5f43a72 100644
--- a/drivers/pcmcia/vrc4173_cardu.c
+++ b/drivers/pcmcia/vrc4173_cardu.c
@@ -474,43 +474,63 @@ static int __devinit vrc4173_cardu_probe(struct pci_dev *dev,
 		return err;
 
 	start = pci_resource_start(dev, 0);
-	if (start == 0)
-		return -ENODEV;
+	if (start == 0) {
+		ret = -ENODEV;
+		goto disable;
+	}
 
 	len = pci_resource_len(dev, 0);
-	if (len == 0)
-		return -ENODEV;
+	if (len == 0) {
+		ret = -ENODEV;
+		goto disable;
+	}
 
-	if (((flags = pci_resource_flags(dev, 0)) & IORESOURCE_MEM) == 0)
-		return -EBUSY;
+	flags = pci_resource_flags(dev, 0);
+	if ((flags & IORESOURCE_MEM) == 0) {
+		ret = -EBUSY;
+		goto disable;
+	}
 
-	if ((err = pci_request_regions(dev, socket->name)) < 0)
-		return err;
+	err = pci_request_regions(dev, socket->name);
+	if (err < 0) {
+		ret = err;
+		goto disable;
+	}
 
 	socket->base = ioremap(start, len);
-	if (socket->base == NULL)
-		return -ENODEV;
+	if (socket->base == NULL) {
+		ret = -ENODEV;
+		goto release;
+	}
 
 	socket->dev = dev;
 
 	socket->pcmcia_socket = pcmcia_register_socket(slot, &cardu_operations, 1);
 	if (socket->pcmcia_socket == NULL) {
-		iounmap(socket->base);
-		socket->base = NULL;
-		return -ENOMEM;
+		ret =  -ENOMEM;
+		goto unmap;
 	}
 
 	if (request_irq(dev->irq, cardu_interrupt, IRQF_SHARED, socket->name, socket) < 0) {
-		pcmcia_unregister_socket(socket->pcmcia_socket);
-		socket->pcmcia_socket = NULL;
-		iounmap(socket->base);
-		socket->base = NULL;
-		return -EBUSY;
+		ret = -EBUSY;
+		goto unregister;
 	}
 
 	printk(KERN_INFO "%s at %#08lx, IRQ %d\n", socket->name, start, dev->irq);
 
 	return 0;
+
+unregister:
+	pcmcia_unregister_socket(socket->pcmcia_socket);
+	socket->pcmcia_socket = NULL;
+unmap:
+	iounmap(socket->base);
+	socket->base = NULL;
+release:
+	pci_release_regions(dev);
+disable:
+	pci_disable_device(dev);
+	return ret;
 }
 
 static int __devinit vrc4173_cardu_setup(char *options)
-- 
1.7.2.3

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