irqchip/renesas-irqc: Convert to managed initializations

Simplify error handling by converting the driver to use managed
allocations and initializations.

Note that platform_get_resource() and ioremap_nocache() are combined in
devm_platform_ioremap_resource().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 15 insertions, 39 deletions

diff --git a/drivers/irqchip/irq-renesas-irqc.c b/drivers/irqchip/irq-renesas-irqc.c
index af03ee31a87b..cde9f9c0687e 100644
--- a/drivers/irqchip/irq-renesas-irqc.c
+++ b/drivers/irqchip/irq-renesas-irqc.c
@@ -126,16 +126,13 @@ static int irqc_probe(struct platform_device *pdev)
         struct device *dev = &pdev->dev;
         const char *name = dev_name(dev);
         struct irqc_priv *p;
-        struct resource *io;
         struct resource *irq;
         int ret;
         int k;
 
-        p = kzalloc(sizeof(*p), GFP_KERNEL);
-        if (!p) {
-                ret = -ENOMEM;
-                goto err0;
-        }
+        p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
 
         p->dev = dev;
         platform_set_drvdata(pdev, p);
@@ -143,14 +140,6 @@ static int irqc_probe(struct platform_device *pdev)
         pm_runtime_enable(dev);
         pm_runtime_get_sync(dev);
 
-        /* get hold of manadatory IOMEM */
-        io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!io) {
-                dev_err(dev, "not enough IOMEM resources\n");
-                ret = -EINVAL;
-                goto err1;
-        }
-
         /* allow any number of IRQs between 1 and IRQC_IRQ_MAX */
         for (k = 0; k < IRQC_IRQ_MAX; k++) {
                 irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
@@ -166,14 +155,14 @@ static int irqc_probe(struct platform_device *pdev)
         if (p->number_of_irqs < 1) {
                 dev_err(dev, "not enough IRQ resources\n");
                 ret = -EINVAL;
-                goto err1;
+                goto err_runtime_pm_disable;
         }
 
         /* ioremap IOMEM and setup read/write callbacks */
-        p->iomem = ioremap_nocache(io->start, resource_size(io));
-        if (!p->iomem) {
-                ret = -ENXIO;
-                goto err2;
+        p->iomem = devm_platform_ioremap_resource(pdev, 0);
+        if (IS_ERR(p->iomem)) {
+                ret = PTR_ERR(p->iomem);
+                goto err_runtime_pm_disable;
         }
 
         p->cpu_int_base = p->iomem + IRQC_INT_CPU_BASE(0); /* SYS-SPI */
@@ -183,7 +172,7 @@ static int irqc_probe(struct platform_device *pdev)
         if (!p->irq_domain) {
                 ret = -ENXIO;
                 dev_err(dev, "cannot initialize irq domain\n");
-                goto err2;
+                goto err_runtime_pm_disable;
         }
 
         ret = irq_alloc_domain_generic_chips(p->irq_domain, p->number_of_irqs,
@@ -191,7 +180,7 @@ static int irqc_probe(struct platform_device *pdev)
                                              0, 0, IRQ_GC_INIT_NESTED_LOCK);
         if (ret) {
                 dev_err(dev, "cannot allocate generic chip\n");
-                goto err3;
+                goto err_remove_domain;
         }
 
         p->gc = irq_get_domain_generic_chip(p->irq_domain, 0);
@@ -206,46 +195,33 @@ static int irqc_probe(struct platform_device *pdev)
 
         /* request interrupts one by one */
         for (k = 0; k < p->number_of_irqs; k++) {
-                if (request_irq(p->irq[k].requested_irq, irqc_irq_handler,
-                                0, name, &p->irq[k])) {
+                if (devm_request_irq(dev, p->irq[k].requested_irq,
+                                     irqc_irq_handler, 0, name, &p->irq[k])) {
                         dev_err(dev, "failed to request IRQ\n");
                         ret = -ENOENT;
-                        goto err4;
+                        goto err_remove_domain;
                 }
         }
 
         dev_info(dev, "driving %d irqs\n", p->number_of_irqs);
 
         return 0;
-err4:
-        while (--k >= 0)
-                free_irq(p->irq[k].requested_irq, &p->irq[k]);
 
-err3:
+err_remove_domain:
         irq_domain_remove(p->irq_domain);
-err2:
-        iounmap(p->iomem);
-err1:
+err_runtime_pm_disable:
         pm_runtime_put(dev);
         pm_runtime_disable(dev);
-        kfree(p);
-err0:
         return ret;
 }
 
 static int irqc_remove(struct platform_device *pdev)
 {
         struct irqc_priv *p = platform_get_drvdata(pdev);
-        int k;
-
-        for (k = 0; k < p->number_of_irqs; k++)
-                free_irq(p->irq[k].requested_irq, &p->irq[k]);
 
         irq_domain_remove(p->irq_domain);
-        iounmap(p->iomem);
         pm_runtime_put(&pdev->dev);
         pm_runtime_disable(&pdev->dev);
-        kfree(p);
         return 0;
 }