openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

irqchip/sirfsoc: Fix generic chip allocation wreckage 

irq_alloc_domain_generic_chips() can only be called once for an
irqdomain. The sirfsoc init calls it twice and because the return
value is not checked it does not notice the wreckage.

The code works by chance because the first call already allocates two
chips and therefor the second call to sirfsoc_alloc_gc() operates on
the proper generic chip instance.

Use a single call and setup the two chips in the obvious correct way.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Barry Song <baohua@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Olof Johansson <olof@lixom.net>
Link: http://lkml.kernel.org/r/20150706101543.470696950@linutronix.de
This commit is contained in:
Thomas Gleixner 2015-07-06 10:18:29 +00:00
parent b66231183a
commit d452bca82d
1 changed files with 23 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/irqchip/irq-sirfsoc.c
View File

@ -22,29 +22,33 @@
#define SIRFSOC_INT_RISC_LEVEL0 0x0020
#define SIRFSOC_INT_RISC_LEVEL1 0x0024
#define SIRFSOC_INIT_IRQ_ID 0x0038
#define SIRFSOC_INT_BASE_OFFSET 0x0004
#define SIRFSOC_NUM_IRQS 64
#define SIRFSOC_NUM_BANKS (SIRFSOC_NUM_IRQS / 32)
static struct irq_domain *sirfsoc_irqdomain;
static __init void
sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
static __init void sirfsoc_alloc_gc(void __iomem *base)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
int ret;
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
unsigned int set = IRQ_LEVEL;
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
int i;
ret = irq_alloc_domain_generic_chips(sirfsoc_irqdomain, num, 1, "irq_sirfsoc",
handle_level_irq, clr, set, IRQ_GC_INIT_MASK_CACHE);
irq_alloc_domain_generic_chips(sirfsoc_irqdomain, 32, 1, "irq_sirfsoc",
handle_level_irq, clr, set,
IRQ_GC_INIT_MASK_CACHE);
gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, irq_start);
gc->reg_base = base;
for (i = 0; i < SIRFSOC_NUM_BANKS; i++) {
gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, i * 32);
gc->reg_base = base + i * SIRFSOC_INT_BASE_OFFSET;
ct = gc->chip_types;
ct->chip.irq_mask = irq_gc_mask_clr_bit;
ct->chip.irq_unmask = irq_gc_mask_set_bit;
ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
}
}
static void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
@ -65,9 +69,7 @@ static int __init sirfsoc_irq_init(struct device_node *np,
sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
&irq_generic_chip_ops, base);
sirfsoc_alloc_gc(base, 0, 32);
sirfsoc_alloc_gc(base + 4, 32, SIRFSOC_NUM_IRQS - 32);
sirfsoc_alloc_gc(base);
writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);