* FW: Regression in next-20100618
@ 2010-06-24 12:17 Linus WALLEIJ
2010-06-24 13:34 ` Alan Cox
0 siblings, 1 reply; 2+ messages in thread
From: Linus WALLEIJ @ 2010-06-24 12:17 UTC (permalink / raw)
To: linux-arm-kernel
Looping in linux-arm-kernel in case there are more people having
this regression on -next since 20100618.
I verified that the regression also appears on U300, and I
suspect all platforms using PL011 to suffer from it, including
Versatile, RealView and SPEAr for example.
Symptom: garbage characters at TTY prompt after boot.
Trying to figure out what is causing this but failing :-/
Yours,
Linus Walleij
-----Original Message-----
From: Linus WALLEIJ
Sent: den 23 juni 2010 23:54
To: 'Alan Cox'
Cc: 'Greg Kroah-Hartman'; 'linux-kernel at vger.kernel.org'
Subject: Regression in next-20100618
Hi Alan,
I have a regression in the next tree from 20100618, the prompt
freezes on the U8500. Drilling down with git bisecting found:
34ffc9670d67fe068f9d8582dd4d2a18d9a61205
Author: Alan Cox <alan@linux•intel.com>
Date: Tue Jun 1 22:53:00 2010 +0200
serial: Use block_til_ready helper
Our code now rather closely resembles the helper, so switch to it.
Signed-off-by: Alan Cox <alan@linux•intel.com>
Cc: Arnd Bergmann <arnd@arndb•de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse•de>
Reverting the commit makes the problem go away.
This platform is using drivers/serial/amba-pl011.c
Any ideas I could try out to help troubleshooting this one?
It could be that you're provoking some bug in amba-pl011.c.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 2+ messages in thread* Regression in next-20100618
2010-06-24 12:17 FW: Regression in next-20100618 Linus WALLEIJ
@ 2010-06-24 13:34 ` Alan Cox
0 siblings, 0 replies; 2+ messages in thread
From: Alan Cox @ 2010-06-24 13:34 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, 24 Jun 2010 14:17:51 +0200
Linus WALLEIJ <linus.walleij@stericsson•com> wrote:
> Looping in linux-arm-kernel in case there are more people having
> this regression on -next since 20100618.
>
> I verified that the regression also appears on U300, and I
> suspect all platforms using PL011 to suffer from it, including
> Versatile, RealView and SPEAr for example.
>
> Symptom: garbage characters at TTY prompt after boot.
>
> Trying to figure out what is causing this but failing :-/
I know what the problem is - I've just not yet had time to fix it (or a
stable electricity supply this afternoon).
The serial layer doesn't cope with the fact the tty_port code manages
the active flag so needs to switch to its own - and clear it in
->shutdown/set it in open
Alan
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-06-24 12:17 FW: Regression in next-20100618 Linus WALLEIJ
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