From 3b7a628decfb3b385ca5169d7c415752bf40e536 Mon Sep 17 00:00:00 2001 From: Ivan Orlov Date: Tue, 20 Jun 2023 16:41:38 +0200 Subject: comedi: make all 'class' structures const Now that the driver core allows for struct class to be in read-only memory, making all 'class' structures to be declared at build time placing them into read-only memory, instead of having to be dynamically allocated at load time. Cc: Ian Abbott Cc: H Hartley Sweeten Cc: Benjamin Tissoires Cc: Ivan Orlov Cc: Xuezhi Zhang Suggested-by: Greg Kroah-Hartman Signed-off-by: Ivan Orlov Link: https://lore.kernel.org/r/20230620144137.581406-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman --- drivers/comedi/comedi_fops.c | 47 ++++++++++++++++++++++---------------------- 1 file changed, 24 insertions(+), 23 deletions(-) (limited to 'drivers/comedi/comedi_fops.c') diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c index 8e43918d38c4..1548dea15df1 100644 --- a/drivers/comedi/comedi_fops.c +++ b/drivers/comedi/comedi_fops.c @@ -97,7 +97,6 @@ static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); static struct comedi_subdevice *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; -static struct class *comedi_class; static struct cdev comedi_cdev; static void comedi_device_init(struct comedi_device *dev) @@ -187,18 +186,6 @@ static struct comedi_device *comedi_clear_board_minor(unsigned int minor) return dev; } -static void comedi_free_board_dev(struct comedi_device *dev) -{ - if (dev) { - comedi_device_cleanup(dev); - if (dev->class_dev) { - device_destroy(comedi_class, - MKDEV(COMEDI_MAJOR, dev->minor)); - } - comedi_dev_put(dev); - } -} - static struct comedi_subdevice * comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned int minor) { @@ -611,6 +598,23 @@ static struct attribute *comedi_dev_attrs[] = { }; ATTRIBUTE_GROUPS(comedi_dev); +static const struct class comedi_class = { + .name = "comedi", + .dev_groups = comedi_dev_groups, +}; + +static void comedi_free_board_dev(struct comedi_device *dev) +{ + if (dev) { + comedi_device_cleanup(dev); + if (dev->class_dev) { + device_destroy(&comedi_class, + MKDEV(COMEDI_MAJOR, dev->minor)); + } + comedi_dev_put(dev); + } +} + static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s, unsigned int bits) { @@ -3263,7 +3267,7 @@ struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) return ERR_PTR(-EBUSY); } dev->minor = i; - csdev = device_create(comedi_class, hardware_device, + csdev = device_create(&comedi_class, hardware_device, MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); if (!IS_ERR(csdev)) dev->class_dev = get_device(csdev); @@ -3312,7 +3316,7 @@ int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) } i += COMEDI_NUM_BOARD_MINORS; s->minor = i; - csdev = device_create(comedi_class, dev->class_dev, + csdev = device_create(&comedi_class, dev->class_dev, MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", dev->minor, s->index); if (!IS_ERR(csdev)) @@ -3337,7 +3341,7 @@ void comedi_free_subdevice_minor(struct comedi_subdevice *s) comedi_subdevice_minor_table[i] = NULL; mutex_unlock(&comedi_subdevice_minor_table_lock); if (s->class_dev) { - device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); + device_destroy(&comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); s->class_dev = NULL; } } @@ -3383,15 +3387,12 @@ static int __init comedi_init(void) if (retval) goto out_unregister_chrdev_region; - comedi_class = class_create("comedi"); - if (IS_ERR(comedi_class)) { - retval = PTR_ERR(comedi_class); + retval = class_register(&comedi_class); + if (retval) { pr_err("failed to create class\n"); goto out_cdev_del; } - comedi_class->dev_groups = comedi_dev_groups; - /* create devices files for legacy/manual use */ for (i = 0; i < comedi_num_legacy_minors; i++) { struct comedi_device *dev; @@ -3413,7 +3414,7 @@ static int __init comedi_init(void) out_cleanup_board_minors: comedi_cleanup_board_minors(); - class_destroy(comedi_class); + class_unregister(&comedi_class); out_cdev_del: cdev_del(&comedi_cdev); out_unregister_chrdev_region: @@ -3425,7 +3426,7 @@ module_init(comedi_init); static void __exit comedi_cleanup(void) { comedi_cleanup_board_minors(); - class_destroy(comedi_class); + class_unregister(&comedi_class); cdev_del(&comedi_cdev); unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); -- cgit v1.2.3