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SubjectRe: hci_ldsic nested locking problem
[ +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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