When the parallel port is usb based and the lp attaches to it based on LP_PARPORT_AUTO, we do get /dev/lp0 and when we remove the usb device /dev/lp0 is unregistered. But if we now reconnect the usb device we get /dev/lp1, another disconnection and reconnection and we get /dev/lp2.
Use the port number array to find the first unused lp number and use that to register the lp device with the parallel port. Signed-off-by: Sudip Mukherjee <[email protected]> --- drivers/char/lp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/char/lp.c b/drivers/char/lp.c index e21ed4007d0f..0e081f521f51 100644 --- a/drivers/char/lp.c +++ b/drivers/char/lp.c @@ -958,7 +958,11 @@ static void lp_attach(struct parport *port) printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); return; } - if (!lp_register(lp_count, port)) + for (i = 0; i < LP_NO; i++) + if (port_num[i] == -1) + break; + + if (!lp_register(i, port)) lp_count++; break; -- 2.11.0
