On Thu, 17 Mar 2016 14:19:15 +0000
Jon Hunter <jonathanh@xxxxxxxxxx> wrote:
> 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 | 57 ++++++++++++++++++++++++++++++++++-------------
> 1 file changed, 41 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index b0a781f8c450..42a1412b5186 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -999,13 +999,13 @@ 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);
>
> @@ -1030,17 +1030,16 @@ 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) {
> @@ -1052,9 +1051,8 @@ 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);
> @@ -1104,8 +1102,10 @@ 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) {
> /*
> @@ -1127,6 +1127,18 @@ 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);
Ah, this is where Linus' remark about "GICv2" clashes. Either you keep
the allocation in the previous patch, or you guard this with a test on
the EOImode. I'll leave it up to you.
> +
> + return ret;
> }
>
> void __init gic_init(unsigned int gic_nr, int irq_start,
> @@ -1187,7 +1199,7 @@ 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;
> @@ -1212,8 +1224,14 @@ 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);
>
> @@ -1302,7 +1320,7 @@ 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,
> @@ -1345,7 +1363,14 @@ 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);
>
Otherwise looks good.
M.
--
Jazz is not dead. It just smells funny.
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