linux-kernel - Re: [PATCH] 8250: option 'force

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Message-ID: <20160729102335.2dbe3cad@lxorguk.ukuu.org.uk>
Date:	Fri, 29 Jul 2016 10:23:35 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Max Staudt <mstaudt@...e.de>, "Theodore Ts'o" <tytso@....edu>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 8250: option 'force_polling' for buggy IRQs

> Serial consoles are already polled for output.  So nothing should
> care until userspace starts, and the full serial driver initializes.

At which point it hangs

> So I suspect either "irqfixup" or "irqpoll" would handle this for you.
> If not I am certain a small tweak to some of that code would work.

irqfixup won't usually help but irqpoll with HZ=1000 ought to, although
it has its own set of problems because not all devices with non shared
IRQ lines take kindly to irqpoll.

Alan