On 10/24/2010 10:37 AM, Alan Cox wrote:

quoted text
>> The generic code does not invoke the write_room callback before invoking
>> break_ctl, so there is no way to use this function in usb_serial.
>>     
> Why would it ?
>
>   
Oops, typo...  Last sentence was supposed to end with "in usb_debug".
usb_debug invokes usb_serial_generic_write from break_ctl and ignores
the result; therefore, if there is no room in the generic write FIFO,
the write will fail.  However--usb_debug _only_ uses
usb_serial_generic_write for break_ctl; so if there is no room, it is
because of a previous (uncompleted) break_ctl, and according to standard
UART semantics there is no difference between one break and two...

-a
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/