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authorSudip Mukherjee <sudipm.mukherjee@gmail.com>2018-12-07 17:27:32 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-12-19 12:40:17 +0300
commitdc34da42860d8ce01f64ac11752eecccf53c1a6c (patch)
treeae637d8c0a26d8dcac07db45d602c4125bb03203 /drivers/char
parentd6318c0e8318c200aa95b50769d3635907381c08 (diff)
downloadlinux-dc34da42860d8ce01f64ac11752eecccf53c1a6c.tar.xz
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 <sudipm.mukherjee@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/lp.c6
1 files changed, 5 insertions, 1 deletions
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;