diff options
| author | Sudip Mukherjee <sudipm.mukherjee@gmail.com> | 2018-12-07 17:27:31 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-19 12:40:17 +0300 |
| commit | d6318c0e8318c200aa95b50769d3635907381c08 (patch) | |
| tree | 0be847f7b75c128ea4713fcd6aa33e8c3f851561 /drivers/char/lp.c | |
| parent | 0edf39d2c7dbb4947358dd102b6ff35eaaa92d68 (diff) | |
| download | linux-d6318c0e8318c200aa95b50769d3635907381c08.tar.xz | |
char: lp: detach the device when parallel port is removed
When the parallel port is usb based and the lp attaches to it, we do
get /dev/lp0, but when we remove the usb device and the parallel port
is gone, we are still left with /dev/lp0.
Unregister the device properly in the detach routine based on the port
number it has connected to.
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char/lp.c')
| -rw-r--r-- | drivers/char/lp.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/char/lp.c b/drivers/char/lp.c index 7e207ff0f2fe..e21ed4007d0f 100644 --- a/drivers/char/lp.c +++ b/drivers/char/lp.c @@ -976,6 +976,8 @@ static void lp_attach(struct parport *port) static void lp_detach(struct parport *port) { + int n; + /* Write this some day. */ #ifdef CONFIG_LP_CONSOLE if (console_registered == port) { @@ -983,6 +985,14 @@ static void lp_detach(struct parport *port) console_registered = NULL; } #endif /* CONFIG_LP_CONSOLE */ + + for (n = 0; n < LP_NO; n++) { + if (port_num[n] == port->number) { + port_num[n] = -1; + device_destroy(lp_class, MKDEV(LP_MAJOR, n)); + parport_unregister_device(lp_table[n].dev); + } + } } static struct parport_driver lp_driver = { @@ -1082,8 +1092,6 @@ static int __init lp_init_module(void) static void lp_cleanup_module(void) { - unsigned int offset; - parport_unregister_driver(&lp_driver); #ifdef CONFIG_LP_CONSOLE @@ -1091,13 +1099,6 @@ static void lp_cleanup_module(void) #endif unregister_chrdev(LP_MAJOR, "lp"); - 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)); - } class_destroy(lp_class); } |