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| author |   Sekhar Nori <nsekhar@ti.com> | 2015-12-15 19:56:12 +0530 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2016-01-06 11:35:13 +0100 |
| commit | d3b421cd07e4c0d4d6c0bbd55ca169c054fc081d (patch) | |
| tree | fc3e082b4bd7aaf798c495db3a2d5f838e2dea0d /kernel | |
| parent | irqchip/zevio: Use irq_data_get_chip_type() helper (diff) | |
| download | linux-dev-d3b421cd07e4c0d4d6c0bbd55ca169c054fc081d.tar.xz linux-dev-d3b421cd07e4c0d4d6c0bbd55ca169c054fc081d.zip | |
irqchip/omap-intc: Add support for spurious irq handling
Under some conditions, irq sorting procedure used by INTC can go wrong
resulting in a spurious irq getting reported.
If this condition is not handled, it results in endless stream of:
unexpected IRQ trap at vector 00
messages from ack_bad_irq()
Handle the spurious interrupt condition in omap-intc driver to prevent this.
Measurements using kernel function profiler on AM335x EVM running at 720MHz
show that after this patch omap_intc_handle_irq() takes about 37.4us against
34us before this patch.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Link: http://lkml.kernel.org/r/9c78a6db02ac55f7af7371b417b6e414d2c3095b.1450188128.git.nsekhar@ti.com
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions