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irqchip: crossbar: Check for premapped crossbar before allocating

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If irq_of_parse_and_map is executed twice, the same crossbar is mapped to two
different GIC interrupts. This is completely undesirable. Instead, check
if the requested crossbar event is pre-allocated and provide that GIC
mapping back to caller if already allocated.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-3-git-send-email-r.sricharan@ti.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Nishanth Menon 2014-06-26 12:40:20 +05:30 committed by Jason Cooper
parent 1d50d2ce63
commit 6f16fc878a
1 changed files with 16 additions and 0 deletions
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16
drivers/irqchip/irq-crossbar.c
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@ -51,6 +51,17 @@ static inline void crossbar_writeb(int irq_no, int cb_no)
writeb(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);
}
static inline int get_prev_map_irq(int cb_no)
{
int i;
for (i = 0; i < cb->int_max; i++)
if (cb->irq_map[i] == cb_no)
return i;
return -ENODEV;
}
static inline int allocate_free_irq(int cb_no)
{
int i;
@ -88,11 +99,16 @@ static int crossbar_domain_xlate(struct irq_domain *d,
{
unsigned long ret;
ret = get_prev_map_irq(intspec[1]);
if (!IS_ERR_VALUE(ret))
goto found;
ret = allocate_free_irq(intspec[1]);
if (IS_ERR_VALUE(ret))
return ret;
found:
*out_hwirq = ret + GIC_IRQ_START;
return 0;
}