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Date:	Thu, 20 Mar 2014 12:40:40 -0700
From:	Marcel Holtmann <>
To:	Felipe Balbi <>
Cc:	Greg KH <>,,,
	Peter Hurley <>,,,
	Linux OMAP Mailing List <>,
	Linux Kernel Mailing List <>
Subject: Re: [PATCH 09/11] bluetooth: hci_ldisc: fix deadlock condition

Hi Felipe,

> LDISCs shouldn't call tty->ops->write() from within
> ->write_wakeup().
> ->write_wakeup() is called with port lock taken and
> IRQs disabled, tty->ops->write() will try to acquire
> the same port lock and we will deadlock.
> Reviewed-by: Peter Hurley <>
> Reported-by: Huang Shijie <>
> Signed-off-by: Felipe Balbi <>
> ---
> drivers/bluetooth/hci_ldisc.c | 24 +++++++++++++++++++-----
> drivers/bluetooth/hci_uart.h  |  1 +
> 2 files changed, 20 insertions(+), 5 deletions(-)

I hope these are not causing any conflicts with bluetooth-next / linux-next. If not, then I can let Greg take it through tty-next tree.

Acked-by: Marcel Holtmann <>



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