Char: cyclades, tty_register_device separately for each device

Do not register all tty devices at the init time, delay it for the time until
some device is found.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index 970d99a69a2b..4434c1347221 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -4841,6 +4841,9 @@ static int __init cy_detect_isa(void)
                         cy_isa_irq);
                 printk("%d channels starting from port %d.\n",
                         cy_isa_nchan, cy_next_channel);
+                for (j = cy_next_channel;
+                                j < cy_next_channel + cy_isa_nchan; j++)
+                        tty_register_device(cy_serial_driver, j, NULL);
                 cy_next_channel += cy_isa_nchan;
         }
         return nboard;
@@ -4948,6 +4951,8 @@ static int __devinit cy_init_Ze(unsigned long cy_pci_phys0,
 
         printk("%d channels starting from port %d.\n",
                 cy_pci_nchan, cy_next_channel);
+        for (j = cy_next_channel; j < cy_next_channel + cy_pci_nchan; j++)
+                tty_register_device(cy_serial_driver, j, &pdev->dev);
         cy_next_channel += cy_pci_nchan;
 
         return 0;
@@ -5115,6 +5120,9 @@ static int __devinit cy_pci_probe(struct pci_dev *pdev,
                         (int)cy_pci_irq);
                 printk("%d channels starting from port %d.\n",
                         cy_pci_nchan, cy_next_channel);
+                for (j = cy_next_channel;
+                                j < cy_next_channel + cy_pci_nchan; j++)
+                        tty_register_device(cy_serial_driver, j, &pdev->dev);
 
                 cy_next_channel += cy_pci_nchan;
         } else if (device_id == PCI_DEVICE_ID_CYCLOM_Z_Lo) {
@@ -5282,6 +5290,9 @@ static int __devinit cy_pci_probe(struct pci_dev *pdev,
 
                 printk("%d channels starting from port %d.\n",
                                 cy_pci_nchan, cy_next_channel);
+                for (j = cy_next_channel;
+                                j < cy_next_channel + cy_pci_nchan; j++)
+                        tty_register_device(cy_serial_driver, j, &pdev->dev);
                 cy_next_channel += cy_pci_nchan;
         }
 
@@ -5346,6 +5357,9 @@ static void __devexit cy_pci_release(struct pci_dev *pdev)
                 cy_port[i].line = -1;
                 cy_port[i].magic = -1;
         }
+        for (i = cinfo->first_line; i < cinfo->first_line +
+                        cinfo->nports; i++)
+                tty_unregister_device(cy_serial_driver, i);
 #endif
 }
 
@@ -5479,7 +5493,7 @@ static int __init cy_init(void)
         cy_serial_driver->init_termios = tty_std_termios;
         cy_serial_driver->init_termios.c_cflag =
             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
-        cy_serial_driver->flags = TTY_DRIVER_REAL_RAW;
+        cy_serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
         tty_set_operations(cy_serial_driver, &cy_ops);
 
         retval = tty_register_driver(cy_serial_driver);
@@ -5555,6 +5569,10 @@ static void __exit cy_cleanup_module(void)
 #endif /* CONFIG_CYZ_INTR */
                                 )
                                 free_irq(cy_card[i].irq, &cy_card[i]);
+                        for (e1 = cy_card[i].first_line;
+                                        e1 < cy_card[i].first_line +
+                                        cy_card[i].nports; e1++)
+                                tty_unregister_device(cy_serial_driver, e1);
                 }
         }
 } /* cy_cleanup_module */