The patch below does not apply to the 3.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.
thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b5f83e9b069f4bf19214ca6130947806a2b853fa Mon Sep 17 00:00:00 2001 From: Markus Pargmann <[email protected]> Date: Tue, 28 May 2013 17:00:57 +0200 Subject: [PATCH] ARM: mxs: icoll: Fix interrupts gpio bank 0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The mxs interrupt controller does not support polling for interrupts, but the driver still does it, which is a relict from pre-MULTI_IRQ_HANDLER times. The existing code assumes that 0x7f means no interrupt, but this value is an actually valid irq number, namely gpio bank 0's irq. This results in the driver not detecting when irq 0x7f is active which makes the machine effectively dead lock. This patch removes the interrupt poll loop and allows usage of gpio0 interrupt without an infinite loop. Signed-off-by: Uwe Kleine-König <[email protected]> Signed-off-by: Markus Pargmann <[email protected]> Cc: [email protected] Signed-off-by: Shawn Guo <[email protected]> diff --git a/drivers/irqchip/irq-mxs.c b/drivers/irqchip/irq-mxs.c index 29889bb..63b3d4e 100644 --- a/drivers/irqchip/irq-mxs.c +++ b/drivers/irqchip/irq-mxs.c @@ -76,16 +76,10 @@ asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs) { u32 irqnr; - do { - irqnr = __raw_readl(icoll_base + HW_ICOLL_STAT_OFFSET); - if (irqnr != 0x7f) { - __raw_writel(irqnr, icoll_base + HW_ICOLL_VECTOR); - irqnr = irq_find_mapping(icoll_domain, irqnr); - handle_IRQ(irqnr, regs); - continue; - } - break; - } while (1); + irqnr = __raw_readl(icoll_base + HW_ICOLL_STAT_OFFSET); + __raw_writel(irqnr, icoll_base + HW_ICOLL_VECTOR); + irqnr = irq_find_mapping(icoll_domain, irqnr); + handle_IRQ(irqnr, regs); } static int icoll_irq_domain_map(struct irq_domain *d, unsigned int virq, -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
