Messages in this thread | | | Date | Thu, 20 Mar 2014 13:34:57 -0400 | From | Peter Hurley <> | Subject | Re: hci_ldsic nested locking problem |
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[ +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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