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| author | Stefan Sørensen <stefan.sorensen@spectralink.com> | 2014-03-06 16:27:15 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-06 07:59:20 -0700 |
| commit | 37e85ea59cd87bcbe23d295c1c416a60e4f38de6 (patch) | |
| tree | bceb921e72567cd264876a4c055757777cbef7b1 /arch | |
| parent | efa1ca365156f7faebbbd7cda83195c51cd17b19 (diff) | |
| download | lwn-37e85ea59cd87bcbe23d295c1c416a60e4f38de6.tar.gz lwn-37e85ea59cd87bcbe23d295c1c416a60e4f38de6.zip | |
ARM: OMAP2+: INTC: Acknowledge stuck active interrupts
commit 698b48532539484b012fb7c4176b959d32a17d00 upstream.
When an interrupt has become active on the INTC it will stay active
until it is acked, even if masked or de-asserted. The
INTC_PENDING_IRQn registers are however updated and since these are
used by omap_intc_handle_irq to determine which interrupt to handle,
it will never see the active interrupt. This will result in a storm of
useless interrupts that is only stopped when another higher priority
interrupt is asserted.
Fix by sending the INTC an acknowledge if we find no interrupts to
handle.
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap2/irq.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c index e022a869bff2..6037a9a01ed5 100644 --- a/arch/arm/mach-omap2/irq.c +++ b/arch/arm/mach-omap2/irq.c @@ -222,6 +222,7 @@ void __init ti81xx_init_irq(void) static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs) { u32 irqnr; + int handled_irq = 0; do { irqnr = readl_relaxed(base_addr + 0x98); @@ -249,8 +250,15 @@ out: if (irqnr) { irqnr = irq_find_mapping(domain, irqnr); handle_IRQ(irqnr, regs); + handled_irq = 1; } } while (irqnr); + + /* If an irq is masked or deasserted while active, we will + * keep ending up here with no irq handled. So remove it from + * the INTC with an ack.*/ + if (!handled_irq) + omap_ack_irq(NULL); } asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs) |