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char: lp: use first unused lp number while registering

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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 <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee 2018-12-07 14:27:32 +00:00 committed by Greg Kroah-Hartman
parent d6318c0e83
commit dc34da4286
1 changed files with 5 additions and 1 deletions
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6
drivers/char/lp.c
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@ -958,7 +958,11 @@ static void lp_attach(struct parport *port)
printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
return; 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++; lp_count++;
break; break;