linux-kernel - Re: [PATCH] TTY: fix UV serial console regression

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Message-ID: <20120112234132.0a973cb9@pyramind.ukuu.org.uk>
Date:	Thu, 12 Jan 2012 23:41:32 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	gregkh@...e.de, Arnd Bergmann <arnd@...db.de>,
	alan@...ux.intel.com, linux-serial@...r.kernel.org,
	jirislaby@...il.com, linux-kernel@...r.kernel.org,
	"3.0 3.1 3.2" <stable@...r.kernel.org>
Subject: Re: [PATCH] TTY: fix UV serial console regression

> Unless there is some bad race in the code, the hardware seems to be
> pretty broken. Otherwise pure MSR read should not cause such a bug,
> or?

UV serial being what actual hardware and system ?

> So to prevent the bug, revert to the old behavior. I.e. read modem
> status only if we really have to -- for non-CLOCAL set serials.
> Non-CLOCAL works on this hardware OK, I tried. See? I don't.

The old behaviour is rather driver dependant eg whether it used
serial_core or not.

Doesn't look an unreasonable change though.

Alan
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