Re: hci_ldsic nested locking problem

[Peter Hurley]

[ +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

Regards,
Peter Hurley
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