char: lp: introduce list to save port number

When we are registering lp in LP_PARPORT_AUTO mode, we are not keeping
any record of the parallel port number to which lp is connecting.
Add an array to save the port number to it.

Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index e0a92d764eee..7e207ff0f2fe 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -141,6 +141,7 @@
 
 static DEFINE_MUTEX(lp_mutex);
 static struct lp_struct lp_table[LP_NO];
+static int port_num[LP_NO];
 
 static unsigned int lp_count = 0;
 static struct class *lp_class;
@@ -938,6 +939,7 @@ static int lp_register(int nr, struct parport *port)
                                CONSOLE_LP, port->name);
         }
 #endif
+        port_num[nr] = port->number;
 
         return 0;
 }
@@ -1013,6 +1015,7 @@ static int __init lp_init(void)
                 init_waitqueue_head(&lp_table[i].dataq);
                 mutex_init(&lp_table[i].port_mutex);
                 lp_table[i].timeout = 10 * HZ;
+                port_num[i] = -1;
         }
 
         if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
@@ -1091,6 +1094,7 @@ static void lp_cleanup_module(void)
         for (offset = 0; offset < LP_NO; offset++) {
                 if (lp_table[offset].dev == NULL)
                         continue;
+                port_num[offset] = -1;
                 parport_unregister_device(lp_table[offset].dev);
                 device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
         }