From dc34da42860d8ce01f64ac11752eecccf53c1a6c Mon Sep 17 00:00:00 2001 From: Sudip Mukherjee Date: Fri, 7 Dec 2018 14:27:32 +0000 Subject: [PATCH] char: lp: use first unused lp number while registering 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 Signed-off-by: Greg Kroah-Hartman --- 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 e21ed4007d0fe..0e081f521f510 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; -- 2.30.2