Messages in this thread | | | Date | Sun, 3 Feb 2002 00:33:09 +0000 | From | Russell King <> | Subject | Re: PROBLEM: serial port driver grabs occupied port |
| |
On Sat, Feb 02, 2002 at 11:21:00PM +0000, Christoph Bartelmus wrote: > Now the problem: > 3. Open the /dev/ttySx for the port that is occupied by the lirc_serial > module. rs_open() does not check the state of the serial port and returns > no error. Now you can use setserial to hijack the port... lirc_serial > stops working.
One of setserial's basic functions is to configure a ttyS device for a serial port that you know is there. In this patch, you are preventing any port that is in 'PORT_UNKNOWN' state from being changed, even if you want to change the IRQ and IO base address. This is a different, but nevertheless fundamental problem.
The real bug is that serial.c should allows you to change the port from 'PORT_UNKNOWN' even when it can't grab the resources for the port. Thanks for finding it - are you able to work on this more to come up with a better fix?
-- Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux http://www.arm.linux.org.uk/personal/aboutme.html
- 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/
| |