Commit 311d16da authored by Li Zefan's avatar Li Zefan Committed by Frederic Weisbecker
Browse files

ftrace: Return EINVAL when writing invalid val to set_ftrace_filter 



Currently it doesn't warn user on invald value:

 # echo nonexist_symbol > set_ftrace_filter
or:
 # echo 'nonexist_symbol:mod:fuse' > set_ftrace_filter

Better make it return failure.

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4B1DC4BF.2070003@cn.fujitsu.com>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent 3b8e4273

kernel/trace/ftrace.c

+16 −6
Original line number Diff line number Diff line
@@ -1724,7 +1724,7 @@ ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type) 
	return ftrace_match(str, regex, len, type);

}



static void ftrace_match_records(char *buff, int len, int enable)

static int ftrace_match_records(char *buff, int len, int enable)

{

	unsigned int search_len;

	struct ftrace_page *pg;
@@ -1733,6 +1733,7 @@ static void ftrace_match_records(char *buff, int len, int enable) 
	char *search;

	int type;

	int not;

	int found = 0;



	flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;

	type = filter_parse_regex(buff, len, &search, &not);
@@ -1750,6 +1751,7 @@ static void ftrace_match_records(char *buff, int len, int enable) 
				rec->flags &= ~flag;

			else

				rec->flags |= flag;

			found = 1;

		}

		/*

		 * Only enable filtering if we have a function that
@@ -1759,6 +1761,8 @@ static void ftrace_match_records(char *buff, int len, int enable) 
			ftrace_filtered = 1;

	} while_for_each_ftrace_rec();

	mutex_unlock(&ftrace_lock);



	return found;

}



static int
@@ -1780,7 +1784,7 @@ ftrace_match_module_record(struct dyn_ftrace *rec, char *mod, 
		return 1;

}



static void ftrace_match_module_records(char *buff, char *mod, int enable)

static int ftrace_match_module_records(char *buff, char *mod, int enable)

{

	unsigned search_len = 0;

	struct ftrace_page *pg;
@@ -1789,6 +1793,7 @@ static void ftrace_match_module_records(char *buff, char *mod, int enable) 
	char *search = buff;

	unsigned long flag;

	int not = 0;

	int found = 0;



	flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
@@ -1819,12 +1824,15 @@ static void ftrace_match_module_records(char *buff, char *mod, int enable) 
				rec->flags &= ~flag;

			else

				rec->flags |= flag;

			found = 1;

		}

		if (enable && (rec->flags & FTRACE_FL_FILTER))

			ftrace_filtered = 1;



	} while_for_each_ftrace_rec();

	mutex_unlock(&ftrace_lock);



	return found;

}



/*
@@ -1853,8 +1861,9 @@ ftrace_mod_callback(char *func, char *cmd, char *param, int enable) 
	if (!strlen(mod))

		return -EINVAL;



	ftrace_match_module_records(func, mod, enable);

	if (ftrace_match_module_records(func, mod, enable))

		return 0;

	return -EINVAL;

}



static struct ftrace_func_command ftrace_mod_cmd = {
@@ -2151,8 +2160,9 @@ static int ftrace_process_regex(char *buff, int len, int enable) 
	func = strsep(&next, ":");



	if (!next) {

		ftrace_match_records(func, len, enable);

		if (ftrace_match_records(func, len, enable))

			return 0;

		return ret;

	}



	/* command found */

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