From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [PATCH 0/4] serial: omap: robustify for high speed transfers
Date: Wed, 24 Feb 2016 16:46:34 +0100
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To: Sekhar Nori <nsekhar@ti.com>, Peter Hurley <peter@hurleysoftware.com>, John Ogness <john.ogness@linutronix.de>, Tony Lindgren <tony@atomide.com>
Cc: gregkh@linuxfoundation.org, vinod.koul@intel.com, dan.j.williams@intel.com, peter.ujfalusi@ti.com, dmaengine@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
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On 02/24/2016 04:37 PM, Sekhar Nori wrote:
> I don't see the error interrupt count in /proc/interrupts go up although
> the code is returning IRQ_NONE when this happens. I initially thought
> that must be because of the interrupt being IRQF_SHARED. But getting rid
> of IRQF_SHARED still does not lead to error count going up. I need to
> spend some more time to see what is going on.

that error counter goes up if the interrupt controller can not find an
interrupt number. That means a HW interrupt was raised but after
checking the interrupt source (by the GIC) there is none. In this case
we have one: the UART.

> Regards,
> Sekhar

Sebastian