linux-kernel - [PATCH 03/16] usb: gadget: amd5536udc: rewrite udc_pci

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Date:	Mon, 14 Sep 2015 20:42:50 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Thomas Dahlmann <dahlmann.thomas@...or.de>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-geode@...ts.infradead.org,
	linux-usb@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 03/16] usb: gadget: amd5536udc: rewrite udc_pci_probe

A rewrite of udc_pci_probe() with proper error handling. We use here
free_dma_pools() in error handling.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/usb/gadget/udc/amd5536udc.c | 52 +++++++++++++++++++------------------
 1 file changed, 27 insertions(+), 25 deletions(-)

diff --git a/drivers/usb/gadget/udc/amd5536udc.c b/drivers/usb/gadget/udc/amd5536udc.c
index 8b700de..8646f6c 100644
--- a/drivers/usb/gadget/udc/amd5536udc.c
+++ b/drivers/usb/gadget/udc/amd5536udc.c
@@ -3244,17 +3244,13 @@ static int udc_pci_probe(
 
 	/* init */
 	dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
-	if (!dev) {
-		retval = -ENOMEM;
-		goto finished;
-	}
+	if (!dev)
+		return -ENOMEM;
 
 	/* pci setup */
 	if (pci_enable_device(pdev) < 0) {
-		kfree(dev);
-		dev = NULL;
 		retval = -ENODEV;
-		goto finished;
+		goto err_enabledev;
 	}
 	dev->active = 1;
 
@@ -3264,28 +3260,22 @@ static int udc_pci_probe(
 
 	if (!request_mem_region(resource, len, name)) {
 		dev_dbg(&pdev->dev, "pci device used already\n");
-		kfree(dev);
-		dev = NULL;
 		retval = -EBUSY;
-		goto finished;
+		goto err_requestmem;
 	}
 	dev->mem_region = 1;
 
 	dev->virt_addr = ioremap_nocache(resource, len);
 	if (dev->virt_addr == NULL) {
 		dev_dbg(&pdev->dev, "start address cannot be mapped\n");
-		kfree(dev);
-		dev = NULL;
 		retval = -EFAULT;
-		goto finished;
+		goto err_ioremap;
 	}
 
 	if (!pdev->irq) {
 		dev_err(&pdev->dev, "irq not set\n");
-		kfree(dev);
-		dev = NULL;
 		retval = -ENODEV;
-		goto finished;
+		goto err_irqreq;
 	}
 
 	spin_lock_init(&dev->lock);
@@ -3301,10 +3291,8 @@ static int udc_pci_probe(
 
 	if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
 		dev_dbg(&pdev->dev, "request_irq(%d) fail\n", pdev->irq);
-		kfree(dev);
-		dev = NULL;
 		retval = -EBUSY;
-		goto finished;
+		goto err_irqreq;
 	}
 	dev->irq_registered = 1;
 
@@ -3320,7 +3308,7 @@ static int udc_pci_probe(
 	if (use_dma) {
 		retval = init_dma_pools(dev);
 		if (retval != 0)
-			goto finished;
+			goto err_dma;
 	}
 
 	dev->phys_addr = resource;
@@ -3328,12 +3316,26 @@ static int udc_pci_probe(
 	dev->pdev = pdev;
 
 	/* general probing */
-	if (udc_probe(dev) == 0)
-		return 0;
+	if (udc_probe(dev) != 0) {
+		retval = -ENODEV;
+		goto err_probe;
+	}
+	return 0;
 
-finished:
-	if (dev)
-		udc_pci_remove(pdev);
+err_probe:
+	if (use_dma)
+		free_dma_pools(dev);
+err_dma:
+	free_irq(pdev->irq, dev);
+err_irqreq:
+	iounmap(dev->virt_addr);
+err_ioremap:
+	release_mem_region(resource, len);
+err_requestmem:
+	pci_disable_device(pdev);
+err_enabledev:
+	kfree(dev);
+	dev = NULL;
 	return retval;
 }
 
-- 
1.9.1

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