linux-kernel - Re: [PATCH 1/2] sc16is7xx: Do not handle irqs in endless loop

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Date:	Mon, 8 Aug 2016 16:02:10 +0200
From:	Dirk Eibach <dirk.eibach@...ys.cc>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	jslaby@...e.com, jringle@...dpoint.com
Subject: Re: [PATCH 1/2] sc16is7xx: Do not handle irqs in endless loop

2016-08-08 15:43 GMT+02:00 Greg KH <gregkh@...uxfoundation.org>:
> On Mon, Aug 08, 2016 at 03:32:15PM +0200, dirk.eibach@...ys.cc wrote:
>> From: Dirk Eibach <dirk.eibach@...ys.cc>
>>
>> sc16is7xx_port_irq() is laid out as an endless loop. It will exit only
>> when there is no more interrupt left to service. This not common
>> practice.
>> In our case it lead to some strange hangup situation when there was an
>> unexpected XOFF-interrupt that could not be handled.
>> So let's service interrupts only once and report XOFF-interrupts that
>> should never happen since they are never enabled.
>>
>> Signed-off-by: Dirk Eibach <dirk.eibach@...ys.cc>
>>
>> Conflicts:
>>       drivers/tty/serial/sc16is7xx.c
>
> Why are these 2 lines in here?

Sorry, my bad. I have no idea how they slipped in. Will remove them in v2.

Cheers
Dirk