iommu/rockchip: Don't use platform_get_irq to implicitly count irqs

Till now the Rockchip iommu driver walked through the irq list via
platform_get_irq() until it encountered an ENXIO error. With the
recent change to add a central error message, this always results
in such an error for each iommu on probe and shutdown.

To not confuse people, switch to platform_count_irqs() to get the
actual number of interrupts before walking through them.

Fixes: 7723f4c5ecdb ("driver core: platform: Add an error message to platform_get_irq*()")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 26290f3..4dcbf68 100644 (file)
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -100,6 +100,7 @@ struct rk_iommu {
        struct device *dev;
        void __iomem **bases;
        int num_mmu;
+       int num_irq;
        struct clk_bulk_data *clocks;
        int num_clocks;
        bool reset_disabled;
@@ -1136,7 +1137,7 @@ static int rk_iommu_probe(struct platform_device *pdev)
        struct rk_iommu *iommu;
        struct resource *res;
        int num_res = pdev->num_resources;
-       int err, i, irq;
+       int err, i;
 
        iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
        if (!iommu)
@@ -1163,6 +1164,10 @@ static int rk_iommu_probe(struct platform_device *pdev)
        if (iommu->num_mmu == 0)
                return PTR_ERR(iommu->bases[0]);
 
+       iommu->num_irq = platform_irq_count(pdev);
+       if (iommu->num_irq < 0)
+               return iommu->num_irq;
+
        iommu->reset_disabled = device_property_read_bool(dev,
                                        "rockchip,disable-mmu-reset");
 
@@ -1219,8 +1224,9 @@ static int rk_iommu_probe(struct platform_device *pdev)
 
        pm_runtime_enable(dev);
 
-       i = 0;
-       while ((irq = platform_get_irq(pdev, i++)) != -ENXIO) {
+       for (i = 0; i < iommu->num_irq; i++) {
+               int irq = platform_get_irq(pdev, i);
+
                if (irq < 0)
                        return irq;
 
@@ -1245,10 +1251,13 @@ err_unprepare_clocks:
 static void rk_iommu_shutdown(struct platform_device *pdev)
 {
        struct rk_iommu *iommu = platform_get_drvdata(pdev);
-       int i = 0, irq;
+       int i;
+
+       for (i = 0; i < iommu->num_irq; i++) {
+               int irq = platform_get_irq(pdev, i);
 
-       while ((irq = platform_get_irq(pdev, i++)) != -ENXIO)
                devm_free_irq(iommu->dev, irq, iommu);
+       }
 
        pm_runtime_force_suspend(&pdev->dev);
 }