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Date: Mon, 16 Jan 2017 11:37:02 +0530 From: Arvind Yadav <arvind.yadav.cs@...il.com> To: tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com Cc: linux-kernel@...r.kernel.org Subject: [PATCH v2] irqchip: irq-mips-gic:- Avoiding Kernel panics due to Error. Eliminating kernel panic due to NULL pointer dereferencing and other failure in __gic_init. Here, __gic_init can fail. This error check will avoid NULL pointer dereference and kernel panic. Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com> --- drivers/irqchip/irq-mips-gic.c | 40 +++++++++++++++++++++++++++++++--------- 1 file changed, 31 insertions(+), 9 deletions(-) diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c index c01c09e..bf0816f 100644 --- a/drivers/irqchip/irq-mips-gic.c +++ b/drivers/irqchip/irq-mips-gic.c @@ -968,7 +968,7 @@ int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node, .match = gic_ipi_domain_match, }; -static void __init __gic_init(unsigned long gic_base_addr, +static int __init __gic_init(unsigned long gic_base_addr, unsigned long gic_addrspace_size, unsigned int cpu_vec, unsigned int irqbase, struct device_node *node) @@ -979,6 +979,10 @@ static void __init __gic_init(unsigned long gic_base_addr, __gic_base_addr = gic_base_addr; gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size); + if (!gic_base) { + pr_err("Failed to map GIC memory"); + return -ENOMEM; + } gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >> @@ -1035,23 +1039,29 @@ static void __init __gic_init(unsigned long gic_base_addr, gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS + gic_shared_intrs, irqbase, &gic_irq_domain_ops, NULL); - if (!gic_irq_domain) - panic("Failed to add GIC IRQ domain"); + if (!gic_irq_domain) { + pr_err("Failed to add GIC IRQ domain"); + goto iounmap; + } gic_irq_domain->name = "mips-gic-irq"; gic_dev_domain = irq_domain_add_hierarchy(gic_irq_domain, 0, GIC_NUM_LOCAL_INTRS + gic_shared_intrs, node, &gic_dev_domain_ops, NULL); - if (!gic_dev_domain) - panic("Failed to add GIC DEV domain"); + if (!gic_dev_domain) { + pr_err("Failed to add GIC DEV domain"); + goto iounmap; + } gic_dev_domain->name = "mips-gic-dev"; gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain, IRQ_DOMAIN_FLAG_IPI_PER_CPU, GIC_NUM_LOCAL_INTRS + gic_shared_intrs, node, &gic_ipi_domain_ops, NULL); - if (!gic_ipi_domain) - panic("Failed to add GIC IPI domain"); + if (!gic_ipi_domain) { + pr_err("Failed to add GIC IPI domain"); + goto iounmap; + } gic_ipi_domain->name = "mips-gic-ipi"; gic_ipi_domain->bus_token = DOMAIN_BUS_IPI; @@ -1067,13 +1077,22 @@ static void __init __gic_init(unsigned long gic_base_addr, } gic_basic_init(); + return 0; +iounmap: + iounmap(gic_base); + return -ENOMEM; } void __init gic_init(unsigned long gic_base_addr, unsigned long gic_addrspace_size, unsigned int cpu_vec, unsigned int irqbase) { - __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL); + int ret; + + ret = __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, + NULL); + if (ret) + pr_err("Failed to initialize GIC"); } static int __init gic_of_init(struct device_node *node, @@ -1083,6 +1102,7 @@ static int __init gic_of_init(struct device_node *node, unsigned int cpu_vec, i = 0, reserved = 0; phys_addr_t gic_base; size_t gic_len; + int ret; /* Find the first available CPU vector. */ while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors", @@ -1119,7 +1139,9 @@ static int __init gic_of_init(struct device_node *node, write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK); gic_present = true; - __gic_init(gic_base, gic_len, cpu_vec, 0, node); + ret = __gic_init(gic_base, gic_len, cpu_vec, 0, node); + if (ret) + return ret; return 0; } -- 1.9.1
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