linux-master/fs/char_dev.c

53 	struct char_device_struct *cd;
56 	for (cd = chrdevs[major_to_index(offset)]; cd; cd = cd->next) {
57 		if (cd->major == offset)
58 			seq_printf(f, "%3d %s\n", cd->major, cd->name);
68 	struct char_device_struct *cd;
77 		for (cd = chrdevs[major_to_index(i)]; cd; cd = cd->next)
78 			if (cd->major == i)
81 		if (cd == NULL)
100 	struct char_device_struct *cd, *curr, *prev = NULL;
116 	cd = kzalloc(sizeof(struct char_device_struct), GFP_KERNEL);
117 	if (cd == NULL)
150 	cd->major = major;
151 	cd->baseminor = baseminor;
152 	cd->minorct = minorct;
153 	strscpy(cd->name, name, sizeof(cd->name));
156 		cd->next = curr;
157 		chrdevs[i] = cd;
159 		cd->next = prev->next;
160 		prev->next = cd;
164 	return cd;
167 	kfree(cd);
174 	struct char_device_struct *cd = NULL, **cp;
184 		cd = *cp;
185 		*cp = cd->next;
188 	return cd;
202 	struct char_device_struct *cd;
210 		cd = __register_chrdev_region(MAJOR(n), MINOR(n),
212 		if (IS_ERR(cd))
222 	return PTR_ERR(cd);
239 	struct char_device_struct *cd;
240 	cd = __register_chrdev_region(0, baseminor, count, name);
241 	if (IS_ERR(cd))
242 		return PTR_ERR(cd);
243 	*dev = MKDEV(cd->major, cd->baseminor);
272 	struct char_device_struct *cd;
276 	cd = __register_chrdev_region(major, baseminor, count, name);
277 	if (IS_ERR(cd))
278 		return PTR_ERR(cd);
288 	err = cdev_add(cdev, MKDEV(cd->major, baseminor), count);
292 	cd->cdev = cdev;
294 	return major ? 0 : cd->major;
298 	kfree(__unregister_chrdev_region(cd->major, baseminor, count));
338 	struct char_device_struct *cd;
340 	cd = __unregister_chrdev_region(major, baseminor, count);
341 	if (cd && cd->cdev)
342 		cdev_del(cd->cdev);
343 	kfree(cd);