perf: xgene: Remove unnecessary managed resources cleanup

Managed resources in the driver should be automatically cleaned up on
driver detach. It's unnecessary to manually free/unmmap these resources.
One of the manual cleanup causes static checkers to complain.
The bug is reported by Dan Carpenter <dan.carpenter@oracle.com> in [1]

[1] https://www.spinics.net/lists/arm-kernel/msg593012.html

This patch gets rid of all the unnecessary manual cleanup and properly
unregister all the registered PMU devices by the driver on driver detach.

Signed-off-by: Tai Nguyen <ttnguyen@apm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index e841282..eb23311 100644 (file)
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -1147,7 +1147,6 @@ xgene_pmu_dev_add(struct xgene_pmu *xgene_pmu, struct xgene_pmu_dev_ctx *ctx)
 {
        struct device *dev = xgene_pmu->dev;
        struct xgene_pmu_dev *pmu;
-       int rc;
 
        pmu = devm_kzalloc(dev, sizeof(*pmu), GFP_KERNEL);
        if (!pmu)
@@ -1159,7 +1158,7 @@ xgene_pmu_dev_add(struct xgene_pmu *xgene_pmu, struct xgene_pmu_dev_ctx *ctx)
        switch (pmu->inf->type) {
        case PMU_TYPE_L3C:
                if (!(xgene_pmu->l3c_active_mask & pmu->inf->enable_mask))
-                       goto dev_err;
+                       return -ENODEV;
                if (xgene_pmu->version == PCP_PMU_V3)
                        pmu->attr_groups = l3c_pmu_v3_attr_groups;
                else
@@ -1177,7 +1176,7 @@ xgene_pmu_dev_add(struct xgene_pmu *xgene_pmu, struct xgene_pmu_dev_ctx *ctx)
                break;
        case PMU_TYPE_MCB:
                if (!(xgene_pmu->mcb_active_mask & pmu->inf->enable_mask))
-                       goto dev_err;
+                       return -ENODEV;
                if (xgene_pmu->version == PCP_PMU_V3)
                        pmu->attr_groups = mcb_pmu_v3_attr_groups;
                else
@@ -1185,7 +1184,7 @@ xgene_pmu_dev_add(struct xgene_pmu *xgene_pmu, struct xgene_pmu_dev_ctx *ctx)
                break;
        case PMU_TYPE_MC:
                if (!(xgene_pmu->mc_active_mask & pmu->inf->enable_mask))
-                       goto dev_err;
+                       return -ENODEV;
                if (xgene_pmu->version == PCP_PMU_V3)
                        pmu->attr_groups = mc_pmu_v3_attr_groups;
                else
@@ -1195,19 +1194,14 @@ xgene_pmu_dev_add(struct xgene_pmu *xgene_pmu, struct xgene_pmu_dev_ctx *ctx)
                return -EINVAL;
        }
 
-       rc = xgene_init_perf(pmu, ctx->name);
-       if (rc) {
+       if (xgene_init_perf(pmu, ctx->name)) {
                dev_err(dev, "%s PMU: Failed to init perf driver\n", ctx->name);
-               goto dev_err;
+               return -ENODEV;
        }
 
        dev_info(dev, "%s PMU registered\n", ctx->name);
 
-       return rc;
-
-dev_err:
-       devm_kfree(dev, pmu);
-       return -ENODEV;
+       return 0;
 }
 
 static void _xgene_pmu_isr(int irq, struct xgene_pmu_dev *pmu_dev)
@@ -1515,13 +1509,13 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
        acpi_dev_free_resource_list(&resource_list);
        if (rc < 0) {
                dev_err(dev, "PMU type %d: No resource address found\n", type);
-               goto err;
+               return NULL;
        }
 
        dev_csr = devm_ioremap_resource(dev, &res);
        if (IS_ERR(dev_csr)) {
                dev_err(dev, "PMU type %d: Fail to map resource\n", type);
-               goto err;
+               return NULL;
        }
 
        /* A PMU device node without enable-bit-index is always enabled */
@@ -1535,7 +1529,7 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
        ctx->name = xgene_pmu_dev_name(dev, type, enable_bit);
        if (!ctx->name) {
                dev_err(dev, "PMU type %d: Fail to get device name\n", type);
-               goto err;
+               return NULL;
        }
        inf = &ctx->inf;
        inf->type = type;
@@ -1543,9 +1537,6 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
        inf->enable_mask = 1 << enable_bit;
 
        return ctx;
-err:
-       devm_kfree(dev, ctx);
-       return NULL;
 }
 
 static const struct acpi_device_id xgene_pmu_acpi_type_match[] = {
@@ -1663,20 +1654,20 @@ xgene_pmu_dev_ctx *fdt_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
        void __iomem *dev_csr;
        struct resource res;
        int enable_bit;
-       int rc;
 
        ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
                return NULL;
-       rc = of_address_to_resource(np, 0, &res);
-       if (rc < 0) {
+
+       if (of_address_to_resource(np, 0, &res) < 0) {
                dev_err(dev, "PMU type %d: No resource address found\n", type);
-               goto err;
+               return NULL;
        }
+
        dev_csr = devm_ioremap_resource(dev, &res);
        if (IS_ERR(dev_csr)) {
                dev_err(dev, "PMU type %d: Fail to map resource\n", type);
-               goto err;
+               return NULL;
        }
 
        /* A PMU device node without enable-bit-index is always enabled */
@@ -1686,17 +1677,15 @@ xgene_pmu_dev_ctx *fdt_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
        ctx->name = xgene_pmu_dev_name(dev, type, enable_bit);
        if (!ctx->name) {
                dev_err(dev, "PMU type %d: Fail to get device name\n", type);
-               goto err;
+               return NULL;
        }
+
        inf = &ctx->inf;
        inf->type = type;
        inf->csr = dev_csr;
        inf->enable_mask = 1 << enable_bit;
 
        return ctx;
-err:
-       devm_kfree(dev, ctx);
-       return NULL;
 }
 
 static int fdt_pmu_probe_pmu_dev(struct xgene_pmu *xgene_pmu,
@@ -1868,22 +1857,20 @@ static int xgene_pmu_probe(struct platform_device *pdev)
        xgene_pmu->pcppmu_csr = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(xgene_pmu->pcppmu_csr)) {
                dev_err(&pdev->dev, "ioremap failed for PCP PMU resource\n");
-               rc = PTR_ERR(xgene_pmu->pcppmu_csr);
-               goto err;
+               return PTR_ERR(xgene_pmu->pcppmu_csr);
        }
 
        irq = platform_get_irq(pdev, 0);
        if (irq < 0) {
                dev_err(&pdev->dev, "No IRQ resource\n");
-               rc = -EINVAL;
-               goto err;
+               return -EINVAL;
        }
        rc = devm_request_irq(&pdev->dev, irq, xgene_pmu_isr,
                                IRQF_NOBALANCING | IRQF_NO_THREAD,
                                dev_name(&pdev->dev), xgene_pmu);
        if (rc) {
                dev_err(&pdev->dev, "Could not request IRQ %d\n", irq);
-               goto err;
+               return rc;
        }
 
        raw_spin_lock_init(&xgene_pmu->lock);
@@ -1903,42 +1890,29 @@ static int xgene_pmu_probe(struct platform_device *pdev)
        rc = irq_set_affinity(irq, &xgene_pmu->cpu);
        if (rc) {
                dev_err(&pdev->dev, "Failed to set interrupt affinity!\n");
-               goto err;
+               return rc;
        }
 
        /* Walk through the tree for all PMU perf devices */
        rc = xgene_pmu_probe_pmu_dev(xgene_pmu, pdev);
        if (rc) {
                dev_err(&pdev->dev, "No PMU perf devices found!\n");
-               goto err;
+               return rc;
        }
 
        /* Enable interrupt */
        xgene_pmu->ops->unmask_int(xgene_pmu);
 
        return 0;
-
-err:
-       if (xgene_pmu->pcppmu_csr)
-               devm_iounmap(&pdev->dev, xgene_pmu->pcppmu_csr);
-       devm_kfree(&pdev->dev, xgene_pmu);
-
-       return rc;
 }
 
 static void
 xgene_pmu_dev_cleanup(struct xgene_pmu *xgene_pmu, struct list_head *pmus)
 {
        struct xgene_pmu_dev_ctx *ctx;
-       struct device *dev = xgene_pmu->dev;
-       struct xgene_pmu_dev *pmu_dev;
 
        list_for_each_entry(ctx, pmus, next) {
-               pmu_dev = ctx->pmu_dev;
-               if (pmu_dev->inf->csr)
-                       devm_iounmap(dev, pmu_dev->inf->csr);
-               devm_kfree(dev, ctx);
-               devm_kfree(dev, pmu_dev);
+               perf_pmu_unregister(&ctx->pmu_dev->pmu);
        }
 }
 
@@ -1951,10 +1925,6 @@ static int xgene_pmu_remove(struct platform_device *pdev)
        xgene_pmu_dev_cleanup(xgene_pmu, &xgene_pmu->mcbpmus);
        xgene_pmu_dev_cleanup(xgene_pmu, &xgene_pmu->mcpmus);
 
-       if (xgene_pmu->pcppmu_csr)
-               devm_iounmap(&pdev->dev, xgene_pmu->pcppmu_csr);
-       devm_kfree(&pdev->dev, xgene_pmu);
-
        return 0;
 }