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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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