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Date: Thu, 17 Dec 2015 10:48:26 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <marc.zyngier@....com>,
Jiang Liu <jiang.liu@...ux.intel.com>,
Stephen Warren <swarren@...dotorg.org>,
Thierry Reding <thierry.reding@...il.com>
CC: Kevin Hilman <khilman@...nel.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Grygorii Strashko <grygorii.strashko@...com>,
Lars-Peter Clausen <lars@...afoo.de>,
Linus Walleij <linus.walleij@...aro.org>,
Soren Brinkmann <soren.brinkmann@...inx.com>,
linux-kernel@...r.kernel.org, <linux-tegra@...r.kernel.org>,
Jon Hunter <jonathanh@...dia.com>
Subject: [RFC PATCH V2 5/8] irqchip/gic: Return an error if GIC initialisation fails
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.
Also for non-banked GIC controllers, make sure that we free any memory
allocated if we fail to initialise the IRQ domain.
Signed-off-by: Jon Hunter <jonathanh@...dia.com>
---
drivers/irqchip/irq-gic.c | 56 +++++++++++++++++++++++++++++++++--------------
1 file changed, 40 insertions(+), 16 deletions(-)
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 561a5cb5b8bc..5d1f1d4396c2 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1032,30 +1032,30 @@ 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 >= MAX_GIC_NR);
gic_check_cpu_features();
gic = &gic_data[gic_nr];
-#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 err;
}
for_each_possible_cpu(cpu) {
@@ -1067,9 +1067,8 @@ 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);
@@ -1119,8 +1118,10 @@ 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 err;
+ }
if (gic_nr == 0) {
/*
@@ -1142,6 +1143,16 @@ 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;
+
+err:
+ if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) {
+ free_percpu(gic->dist_base.percpu_base);
+ free_percpu(gic->cpu_base.percpu_base);
+ }
+
+ return ret;
}
void __init gic_init(unsigned int gic_nr, int irq_start,
@@ -1202,7 +1213,7 @@ 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;
@@ -1227,8 +1238,14 @@ 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);
@@ -1317,7 +1334,7 @@ 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,
@@ -1360,7 +1377,14 @@ 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);
return 0;
--
2.1.4
--
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