If the GIC initialisation fails, then currently we do not return an error or clean-up afterwards. Although for root controllers, this failure may be fatal anyway, for secondary controllers, it may not be fatal and so return an error on failure and clean-up. For non-banked GIC controllers, make sure that we free any memory allocated if we fail to initialise the IRQ domain. Please note that free_percpu() only frees memory if the pointer passed to it is not NULL and so it is unnecessary to check if both pointers are valid or not. Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> --- drivers/irqchip/irq-gic.c | 59 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 42 insertions(+), 17 deletions(-) diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index f1b51317267f..d327cb5cbc65 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -997,13 +997,13 @@ static const struct irq_domain_ops gic_irq_domain_ops = { .unmap = gic_irq_domain_unmap, }; -static void __init __gic_init_bases(unsigned int gic_nr, int irq_start, +static int __init __gic_init_bases(unsigned int gic_nr, int irq_start, void __iomem *dist_base, void __iomem *cpu_base, u32 percpu_offset, struct fwnode_handle *handle) { irq_hw_number_t hwirq_base; struct gic_chip_data *gic; - int gic_irqs, irq_base, i; + int gic_irqs, irq_base, i, ret; BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); @@ -1018,7 +1018,7 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start, gic->chip.irq_mask = gic_eoimode1_mask_irq; gic->chip.irq_eoi = gic_eoimode1_eoi_irq; gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity; - gic->chip.name = "GICv2"; + gic->chip.name = kasprintf(GFP_KERNEL, "GICv2"); } else { gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr); } @@ -1028,17 +1028,16 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start, gic->chip.irq_set_affinity = gic_set_affinity; #endif -#ifdef CONFIG_GIC_NON_BANKED - if (percpu_offset) { /* Frankein-GIC without banked registers... */ + if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) { + /* Frankein-GIC without banked registers... */ unsigned int cpu; gic->dist_base.percpu_base = alloc_percpu(void __iomem *); gic->cpu_base.percpu_base = alloc_percpu(void __iomem *); if (WARN_ON(!gic->dist_base.percpu_base || !gic->cpu_base.percpu_base)) { - free_percpu(gic->dist_base.percpu_base); - free_percpu(gic->cpu_base.percpu_base); - return; + ret = -ENOMEM; + goto error; } for_each_possible_cpu(cpu) { @@ -1050,9 +1049,8 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start, } gic_set_base_accessor(gic, gic_get_percpu_base); - } else -#endif - { /* Normal, sane GIC... */ + } else { + /* Normal, sane GIC... */ WARN(percpu_offset, "GIC_NON_BANKED not enabled, ignoring %08x offset!", percpu_offset); @@ -1102,8 +1100,10 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start, hwirq_base, &gic_irq_domain_ops, gic); } - if (WARN_ON(!gic->domain)) - return; + if (WARN_ON(!gic->domain)) { + ret = -ENODEV; + goto error; + } if (gic_nr == 0) { /* @@ -1125,6 +1125,18 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start, gic_dist_init(gic); gic_cpu_init(gic); gic_pm_init(gic); + + return 0; + +error: + if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) { + free_percpu(gic->dist_base.percpu_base); + free_percpu(gic->cpu_base.percpu_base); + } + + kfree(gic->chip.name); + + return ret; } void __init gic_init(unsigned int gic_nr, int irq_start, @@ -1185,7 +1197,7 @@ gic_of_init(struct device_node *node, struct device_node *parent) void __iomem *cpu_base; void __iomem *dist_base; u32 percpu_offset; - int irq; + int irq, ret; if (WARN_ON(!node)) return -ENODEV; @@ -1210,8 +1222,14 @@ gic_of_init(struct device_node *node, struct device_node *parent) if (of_property_read_u32(node, "cpu-offset", &percpu_offset)) percpu_offset = 0; - __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, + ret = __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, &node->fwnode); + if (ret) { + iounmap(dist_base); + iounmap(cpu_base); + return ret; + } + if (!gic_cnt) gic_init_physaddr(node); @@ -1300,7 +1318,7 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header, struct acpi_madt_generic_distributor *dist; void __iomem *cpu_base, *dist_base; struct fwnode_handle *domain_handle; - int count; + int count, ret; /* Collect CPU base addresses */ count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, @@ -1343,7 +1361,14 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header, return -ENOMEM; } - __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle); + ret = __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle); + if (ret) { + pr_err("Failed to initialise GIC\n"); + irq_domain_free_fwnode(domain_handle); + iounmap(cpu_base); + iounmap(dist_base); + return ret; + } acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html