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SubjectRe: 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@ti.com>

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


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