diff options
| author | Nishanth Menon <nm@ti.com> | 2014-06-26 11:10:20 +0400 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2014-06-30 23:11:17 +0400 |
| commit | 6f16fc878a51572a998655e5ef1c396cb269648d (patch) | |
| tree | e97ef38d5c8a50c26dc9eefb8648700f81cf27b4 /drivers/irqchip | |
| parent | 1d50d2ce6337724d30055bdbe082236cc86e6785 (diff) | |
| download | linux-6f16fc878a51572a998655e5ef1c396cb269648d.tar.xz | |
irqchip: crossbar: Check for premapped crossbar before allocating
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>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-crossbar.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c index 20105bcdf408..51d4b878e5d6 100644 --- a/drivers/irqchip/irq-crossbar.c +++ b/drivers/irqchip/irq-crossbar.c @@ -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; } |