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authorSudip Mukherjee <sudipm.mukherjee@gmail.com>2018-12-07 17:27:30 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-12-19 12:40:17 +0300
commit0edf39d2c7dbb4947358dd102b6ff35eaaa92d68 (patch)
tree6954ca960b310afe97a645e8a0bef89a5e38d779
parent2e79c1874968b8fdbf578a2a364ec9b6263c77ca (diff)
downloadlinux-0edf39d2c7dbb4947358dd102b6ff35eaaa92d68.tar.xz
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>
-rw-r--r--drivers/char/lp.c4
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));
}