drivers/char/misc.c

26  * Handling of mouse minor numbers for kerneld:
66 static int misc_minor_alloc(int minor)
70 	if (minor == MISC_DYNAMIC_MINOR) {
80 		/* specific minor, check if it is in dynamic or misc dynamic range  */
81 		if (minor < DYNAMIC_MINORS) {
82 			minor = DYNAMIC_MINORS - minor - 1;
83 			ret = ida_alloc_range(&misc_minors_ida, minor, minor, GFP_KERNEL);
84 		} else if (minor > MISC_DYNAMIC_MINOR) {
85 			ret = ida_alloc_range(&misc_minors_ida, minor, minor, GFP_KERNEL);
94 static void misc_minor_free(int minor)
96 	if (minor < DYNAMIC_MINORS)
97 		ida_free(&misc_minors_ida, DYNAMIC_MINORS - minor - 1);
98 	else if (minor > MISC_DYNAMIC_MINOR)
99 		ida_free(&misc_minors_ida, minor);
123 	seq_printf(seq, "%3i %s\n", p->minor, p->name ? p->name : "");
138 	int minor = iminor(inode);
146 		if (iter->minor != minor)
155 		request_module("char-major-%d-%d", MISC_MAJOR, minor);
159 			if (iter->minor != minor)
211  *	Register a miscellaneous device with the kernel. If the minor
212  *	number is set to %MISC_DYNAMIC_MINOR a minor number is assigned
213  *	and placed in the minor field of the structure. For other cases
214  *	the minor number requested is used.
229 	bool is_dynamic = (misc->minor == MISC_DYNAMIC_MINOR);
236 		int i = misc_minor_alloc(misc->minor);
242 		misc->minor = i;
248 			if (c->minor == misc->minor) {
254 		i = misc_minor_alloc(misc->minor);
261 	dev = MKDEV(MISC_MAJOR, misc->minor);
267 		misc_minor_free(misc->minor);
269 			misc->minor = MISC_DYNAMIC_MINOR;
301 	device_destroy(&misc_class, MKDEV(MISC_MAJOR, misc->minor));
302 	misc_minor_free(misc->minor);