1 // SPDX-License-Identifier: GPL-2.0
3  * fail_function.c: Function-based error injection
5 #include <linux/error-injection.h>
7 #include <linux/fault-inject.h>
42 		if (retv < (unsigned long)-MAX_ERRNO)  in adjust_error_retval()
43 			return (unsigned long)-EINVAL;  in adjust_error_retval()
46 		if (retv != 0 && retv < (unsigned long)-MAX_ERRNO)  in adjust_error_retval()
47 			return (unsigned long)-EINVAL;  in adjust_error_retval()
62 		attr->kp.symbol_name = kstrdup(sym, GFP_KERNEL);  in fei_attr_new()
63 		if (!attr->kp.symbol_name) {  in fei_attr_new()
67 		attr->kp.pre_handler = fei_kprobe_handler;  in fei_attr_new()
68 		attr->kp.post_handler = fei_post_handler;  in fei_attr_new()
69 		attr->retval = adjust_error_retval(addr, 0);  in fei_attr_new()
70 		INIT_LIST_HEAD(&attr->list);  in fei_attr_new()
78 		kfree(attr->kp.symbol_name);  in fei_attr_free()
88 		if (!strcmp(attr->kp.symbol_name, sym))  in fei_attr_lookup()
120 		err = -ENOENT;  in fei_retval_set()
124 	if (attr->kp.addr) {  in fei_retval_set()
125 		if (adjust_error_retval((unsigned long)attr->kp.addr,  in fei_retval_set()
127 			err = -EINVAL;  in fei_retval_set()
130 		attr->retval = val;  in fei_retval_set()
145 		err = -ENOENT;  in fei_retval_get()
147 		*val = attr->retval;  in fei_retval_get()
159 	dir = debugfs_create_dir(attr->kp.symbol_name, fei_debugfs_dir);  in fei_debugfs_add_attr()
166 	debugfs_lookup_and_remove(attr->kp.symbol_name, fei_debugfs_dir);  in fei_debugfs_remove_attr()
174 		regs_set_return_value(regs, attr->retval);  in fei_kprobe_handler()
203 	seq_printf(m, "%ps\n", attr->kp.addr);  in fei_seq_show()
222 	unregister_kprobe(&attr->kp);  in fei_attr_remove()
223 	list_del(&attr->list);  in fei_attr_remove()
266 			ret = -ENOENT;  in fei_write()
276 		ret = -EINVAL;  in fei_write()
280 		ret = -ERANGE;  in fei_write()
284 		ret = -EBUSY;  in fei_write()
289 		ret = -ENOMEM;  in fei_write()
293 	ret = register_kprobe(&attr->kp);  in fei_write()
299 	list_add_tail(&attr->list, &fei_attr_list);  in fei_write()
327 	debugfs_create_file("inject", 0600, dir, NULL, &fei_ops);  in fei_debugfs_init()