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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: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4B1DC4BF.2070003@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Li Zefan 2009-12-08 11:15:11 +08:00 committed by Frederic Weisbecker
parent 3b8e427381
commit 311d16da57
1 changed files with 16 additions and 6 deletions
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22
kernel/trace/ftrace.c
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@ -1724,7 +1724,7 @@ ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type)
return ftrace_match(str, regex, len, 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; unsigned int search_len;
struct ftrace_page *pg; struct ftrace_page *pg;
@ -1733,6 +1733,7 @@ static void ftrace_match_records(char *buff, int len, int enable)
char *search; char *search;
int type; int type;
int not; int not;
int found = 0;
flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
type = filter_parse_regex(buff, len, &search, &not); 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; rec->flags &= ~flag;
else else
rec->flags |= flag; rec->flags |= flag;
found = 1;
} }
/* /*
* Only enable filtering if we have a function that * 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; ftrace_filtered = 1;
} while_for_each_ftrace_rec(); } while_for_each_ftrace_rec();
mutex_unlock(&ftrace_lock); mutex_unlock(&ftrace_lock);
return found;
} }
static int static int
@ -1780,7 +1784,7 @@ ftrace_match_module_record(struct dyn_ftrace *rec, char *mod,
return 1; 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; unsigned search_len = 0;
struct ftrace_page *pg; struct ftrace_page *pg;
@ -1789,6 +1793,7 @@ static void ftrace_match_module_records(char *buff, char *mod, int enable)
char *search = buff; char *search = buff;
unsigned long flag; unsigned long flag;
int not = 0; int not = 0;
int found = 0;
flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; 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; rec->flags &= ~flag;
else else
rec->flags |= flag; rec->flags |= flag;
found = 1;
} }
if (enable && (rec->flags & FTRACE_FL_FILTER)) if (enable && (rec->flags & FTRACE_FL_FILTER))
ftrace_filtered = 1; ftrace_filtered = 1;
} while_for_each_ftrace_rec(); } while_for_each_ftrace_rec();
mutex_unlock(&ftrace_lock); mutex_unlock(&ftrace_lock);
return found;
} }
/* /*
@ -1853,8 +1861,9 @@ ftrace_mod_callback(char *func, char *cmd, char *param, int enable)
if (!strlen(mod)) if (!strlen(mod))
return -EINVAL; return -EINVAL;
ftrace_match_module_records(func, mod, enable); if (ftrace_match_module_records(func, mod, enable))
return 0; return 0;
return -EINVAL;
} }
static struct ftrace_func_command ftrace_mod_cmd = { 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, ":"); func = strsep(&next, ":");
if (!next) { if (!next) {
ftrace_match_records(func, len, enable); if (ftrace_match_records(func, len, enable))
return 0; return 0;
return ret;
} }
/* command found */ /* command found */