arm: mach-msm: fix error handling in msm_iommu_probe()

msm_iommu_probe() didn't free mem_region and mapped IO.
Also if request_mem_region() failed then error handling
code dereferenced NULL pointer.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Acked-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>

arch/arm/mach-msm/iommu_dev.c

@@ -128,7 +128,7 @@ static void msm_iommu_reset(void __iomem *base)
 
 static int msm_iommu_probe(struct platform_device *pdev)
 {
-	struct resource *r;
+	struct resource *r, *r2;
 	struct clk *iommu_clk;
 	struct msm_iommu_drvdata *drvdata;
 	struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
@@ -183,27 +183,27 @@ static int msm_iommu_probe(struct platform_device *pdev)
 
 		len = r->end - r->start + 1;
 
-		r = request_mem_region(r->start, len, r->name);
-		if (!r) {
+		r2 = request_mem_region(r->start, len, r->name);
+		if (!r2) {
 			pr_err("Could not request memory region: "
 			"start=%p, len=%d\n", (void *) r->start, len);
 			ret = -EBUSY;
 			goto fail;
 		}
 
-		regs_base = ioremap(r->start, len);
+		regs_base = ioremap(r2->start, len);
 
 		if (!regs_base) {
 			pr_err("Could not ioremap: start=%p, len=%d\n",
-				 (void *) r->start, len);
+				 (void *) r2->start, len);
 			ret = -EBUSY;
-			goto fail;
+			goto fail_mem;
 		}
 
 		irq = platform_get_irq_byname(pdev, "secure_irq");
 		if (irq < 0) {
 			ret = -ENODEV;
-			goto fail;
+			goto fail_io;
 		}
 
 		mb();
@@ -211,14 +211,14 @@ static int msm_iommu_probe(struct platform_device *pdev)
 		if (GET_IDR(regs_base) == 0) {
 			pr_err("Invalid IDR value detected\n");
 			ret = -ENODEV;
-			goto fail;
+			goto fail_io;
 		}
 
 		ret = request_irq(irq, msm_iommu_fault_handler, 0,
 				"msm_iommu_secure_irpt_handler", drvdata);
 		if (ret) {
 			pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
-			goto fail;
+			goto fail_io;
 		}
 
 		msm_iommu_reset(regs_base);
@@ -237,6 +237,10 @@ static int msm_iommu_probe(struct platform_device *pdev)
 
 	return 0;
 
+fail_io:
+	iounmap(regs_base);
+fail_mem:
+	release_mem_region(r->start, len);
 fail:
 	kfree(drvdata);
 	return ret;