From: Thomas Gleixner <tglx@linutronix.de>
To: Daniel Schnell <daniel.schnell@marel.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: RE: [PATCH] mpx5200_uart: drop port lock across tty_flip_buffer() call
Date: Thu, 26 Jul 2007 11:41:18 +0200 [thread overview]
Message-ID: <1185442878.3227.23.camel@chaos> (raw)
In-Reply-To: <DD39B5C3F4963040ADC9768BE7E430CB02178125@is-hdq-exchange.marel.net>
On Thu, 2007-07-26 at 09:25 +0000, Daniel Schnell wrote:
> Thomas Gleixner wrote:
>
> > On Wed, 2007-07-25 at 13:42 -0600, Grant Likely wrote:
> >> On 7/25/07, Thomas Gleixner <tglx@linutronix.de> wrote:
> >>> The port lock needs to be dropped across the tty_flip_buffer call,
> >>> as it would lead to a deadlock with the spin_lock(&port->lock) in
> >>> uart_start()
> >>>
> >>> Uncovered by lockdep / preempt-rt
> >>>
> >>> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
> While you are at it 8°> ... the mpc5200-fec driver has serious
> problems with preempt-rt, similar to what the IBM emac had ....
Care to whip up a patch ?
tglx
prev parent reply other threads:[~2007-07-26 9:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-25 19:10 [PATCH] mpx5200_uart: drop port lock across tty_flip_buffer() call Thomas Gleixner
2007-07-25 19:42 ` Grant Likely
2007-07-25 19:47 ` Thomas Gleixner
2007-07-25 19:54 ` Grant Likely
2007-07-26 9:25 ` Daniel Schnell
2007-07-26 9:41 ` Thomas Gleixner [this message]
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