linux-kernel - Re: hci_ldsic nested locking problem

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Message-ID: <20140320184544.GA1113@kroah.com>
Date:	Thu, 20 Mar 2014 11:45:44 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Felipe Balbi <balbi@...com>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Alan Cox <alan@...ux.intel.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Muralidharan Karicheri <m-karicheri2@...com>,
	linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Huang Shijie <b32955@...escale.com>
Subject: Re: hci_ldsic nested locking problem

On Thu, Mar 20, 2014 at 12:35:18PM -0500, Felipe Balbi wrote:
> On Thu, Mar 20, 2014 at 01:34:57PM -0400, Peter Hurley wrote:
> > [ +cc Huang Shijie ]
> > 
> > On 03/20/2014 01:29 PM, Felipe Balbi wrote:
> > >then we need updates to Documentation:
> > >
> > >Documentation/serial/tty.txt::
> > >
> > >|  Driver Side Interfaces:
> > >|
> > >|  receive_buf()	-	Hand buffers of bytes from the driver to the ldisc
> > >|  			for processing. Semantics currently rather
> > >|  			mysterious 8(
> > >|
> > >|  write_wakeup()	-	May be called at any point between open and close.
> > >|  			The TTY_DO_WRITE_WAKEUP flag indicates if a call
> > >|  			is needed but always races versus calls. Thus the
> > >|  			ldisc must be careful about setting order and to
> > >|  			handle unexpected calls. Must not sleep.
> > >|
> > >|  			The driver is forbidden from calling this directly
> > >|  			from the ->write call from the ldisc as the ldisc
> > >|  			is permitted to call the driver write method from
> > >|  			this function. In such a situation defer it.
> > >
> > >documentation says ldisc is allowed to call ->write() from
> > >->write_wakeup(). huh ?
> > 
> > Patch submitted but never applied.
> > 
> > http://www.spinics.net/lists/linux-serial/msg11144.html
> 
> Thank you. For that patch:
> 
> Acked-by: Felipe Balbi <balbi@...com>

Can someone resend it, this is lost in my tree for some reason...
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