linux-kernel - Re: REGRESSION: serial_cs broken by 8250 changes

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Message-Id: <20070802163547.39f41af1.akpm@linux-foundation.org>
Date:	Thu, 2 Aug 2007 16:35:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yinghai.Lu@....COM
Cc:	Daniel Ritz <daniel.ritz-ml@...ssonline.ch>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: REGRESSION: serial_cs broken by 8250 changes

On Thu, 02 Aug 2007 16:24:42 -0700
Yinghai Lu <Yinghai.Lu@....COM> wrote:

> Daniel Ritz wrote:
> > commit 18a8bd949d6adb311ea816125ff65050df1f3f6e breaks serial_cs badly
> > with an oops, completely killing PCMCIA.
> > 
> > register_console() now calls console->early_setup(). which in case of
> > 8250.c (the only user anyway) is serial8250_console_early_setup()
> > which is __init, calling 8250_early.c:serial8250_find_port_for_earlycon()
> > which is __init as well. boom.
> > 
> > the changelog mentions SERIAL_PORT_DFNS removal which happens to be
> > commit 7e92b4fc345f5b6f57585fbe5ffdb0f24d7c9b26. but this got reverted
> > by commit 57d4810ea0d9ca58a7bcc1336607f0cede0a2abf. so i'd suggest to
> > just revert the 8250 changes as well.
> > 
> > rgds
> > -daniel
> 
> Is there any flag or sign that init code has been released?

Nope.

> We could use that to prevent init code to be called after code is freed.

If we can omit a function call without breaking anything then we shouldn't
have been calling that function at all ;)

It sounds like making serial8250_console_early_setup() and
serial8250_find_port_for_earlycon() non-__init will fix this.

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