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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>
This commit is contained in:
Sudip Mukherjee 2018-12-07 14:27:30 +00:00 committed by Greg Kroah-Hartman
parent 2e79c18749
commit 0edf39d2c7
1 changed files with 4 additions and 0 deletions
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4
drivers/char/lp.c
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@ -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));
}