iommu/msm: Use devm_ioremap_resource to simplify code

Use devm_ioremap_resource() to make the code simpler, drop unused variable,
redundant return value check, and error-handing code.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/msm_iommu_dev.c b/drivers/iommu/msm_iommu_dev.c
index 08ba497..61def7c 100644 (file)
--- a/drivers/iommu/msm_iommu_dev.c
+++ b/drivers/iommu/msm_iommu_dev.c
@@ -127,13 +127,12 @@ static void msm_iommu_reset(void __iomem *base, int ncb)
 
 static int msm_iommu_probe(struct platform_device *pdev)
 {
-       struct resource *r, *r2;
+       struct resource *r;
        struct clk *iommu_clk;
        struct clk *iommu_pclk;
        struct msm_iommu_drvdata *drvdata;
        struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
        void __iomem *regs_base;
-       resource_size_t len;
        int ret, irq, par;
 
        if (pdev->id == -1) {
@@ -178,35 +177,16 @@ static int msm_iommu_probe(struct platform_device *pdev)
                iommu_clk = NULL;
 
        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase");
-
-       if (!r) {
-               ret = -ENODEV;
-               goto fail_clk;
-       }
-
-       len = resource_size(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;
+       regs_base = devm_ioremap_resource(&pdev->dev, r);
+       if (IS_ERR(regs_base)) {
+               ret = PTR_ERR(regs_base);
                goto fail_clk;
        }
 
-       regs_base = ioremap(r2->start, len);
-
-       if (!regs_base) {
-               pr_err("Could not ioremap: start=%p, len=%d\n",
-                        (void *) r2->start, len);
-               ret = -EBUSY;
-               goto fail_mem;
-       }
-
        irq = platform_get_irq_byname(pdev, "secure_irq");
        if (irq < 0) {
                ret = -ENODEV;
-               goto fail_io;
+               goto fail_clk;
        }
 
        msm_iommu_reset(regs_base, iommu_dev->ncb);
@@ -222,14 +202,14 @@ static int msm_iommu_probe(struct platform_device *pdev)
        if (!par) {
                pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
                ret = -ENODEV;
-               goto fail_io;
+               goto fail_clk;
        }
 
        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_io;
+               goto fail_clk;
        }
 
 
@@ -250,10 +230,6 @@ static int msm_iommu_probe(struct platform_device *pdev)
        clk_disable(iommu_pclk);
 
        return 0;
-fail_io:
-       iounmap(regs_base);
-fail_mem:
-       release_mem_region(r->start, len);
 fail_clk:
        if (iommu_clk) {
                clk_disable(iommu_clk);