[PATCH] iommu: arm-smmu: use devm_request_irq and devm_free_irq

[Peng Fan]

Use devm_request_irq to simplify error handling path,
when probe smmu device.

Also devm_{request|free}_irq when init or destroy domain context.

Signed-off-by: Peng Fan <van.free...@gmail.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: Robin Murphy <robin.mur...@arm.com>
---
 drivers/iommu/arm-smmu.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 9345a3f..860652e 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -987,8 +987,8 @@ static int arm_smmu_init_domain_context(struct iommu_domain 
*domain,
         * handler seeing a half-initialised domain state.
         */
        irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
-       ret = request_irq(irq, arm_smmu_context_fault, IRQF_SHARED,
-                         "arm-smmu-context-fault", domain);
+       ret = devm_request_irq(smmu->dev, irq, arm_smmu_context_fault,
+                              IRQF_SHARED, "arm-smmu-context-fault", domain);
        if (ret < 0) {
                dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n",
                        cfg->irptndx, irq);
@@ -1028,7 +1028,7 @@ static void arm_smmu_destroy_domain_context(struct 
iommu_domain *domain)
 
        if (cfg->irptndx != INVALID_IRPTNDX) {
                irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
-               free_irq(irq, domain);
+               devm_free_irq(smmu->dev, irq, domain);
        }
 
        free_io_pgtable_ops(smmu_domain->pgtbl_ops);
@@ -1986,15 +1986,15 @@ static int arm_smmu_device_dt_probe(struct 
platform_device *pdev)
        }
 
        for (i = 0; i < smmu->num_global_irqs; ++i) {
-               err = request_irq(smmu->irqs[i],
-                                 arm_smmu_global_fault,
-                                 IRQF_SHARED,
-                                 "arm-smmu global fault",
-                                 smmu);
+               err = devm_request_irq(smmu->dev, smmu->irqs[i],
+                                      arm_smmu_global_fault,
+                                      IRQF_SHARED,
+                                      "arm-smmu global fault",
+                                      smmu);
                if (err) {
                        dev_err(dev, "failed to request global IRQ %d (%u)\n",
                                i, smmu->irqs[i]);
-                       goto out_free_irqs;
+                       goto out_put_masters;
                }
        }
 
@@ -2006,10 +2006,6 @@ static int arm_smmu_device_dt_probe(struct 
platform_device *pdev)
        arm_smmu_device_reset(smmu);
        return 0;
 
-out_free_irqs:
-       while (i--)
-               free_irq(smmu->irqs[i], smmu);
-
 out_put_masters:
        for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
                struct arm_smmu_master *master
@@ -2050,7 +2046,7 @@ static int arm_smmu_device_remove(struct platform_device 
*pdev)
                dev_err(dev, "removing device with active domains!\n");
 
        for (i = 0; i < smmu->num_global_irqs; ++i)
-               free_irq(smmu->irqs[i], smmu);
+               devm_free_irq(smmu->dev, smmu->irqs[i], smmu);
 
        /* Turn the thing off */
        writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
-- 
2.6.2