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@xxxxxx> -- balbi
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