From: Nishanth Menon Date: Thu, 26 Jun 2014 07:10:20 +0000 (+0530) Subject: irqchip: crossbar: Check for premapped crossbar before allocating X-Git-Tag: v3.17-rc1~110^2~5^2^2~14 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6f16fc878a51572a998655e5ef1c396cb269648d;p=karo-tx-linux.git 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 Signed-off-by: Sricharan R Acked-by: Santosh Shilimkar Link: https://lkml.kernel.org/r/1403766634-18543-3-git-send-email-r.sricharan@ti.com Signed-off-by: Jason Cooper --- 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; }