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ftrace: Have ftrace_regex_write() return either read or error 

As ftrace_regex_write() reads the result of ftrace_process_regex()
which can sometimes return a positive number, only consider a
failure if the return is negative. Otherwise, it will skip possible
other registered probes and by returning a positive number that
wasn't read, it will confuse the user processes doing the writing.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-05-09 11:35:12 -04:00 committed by Steven Rostedt
parent ff305ded9f
commit 7c088b5120
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/ftrace.c
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@ -3276,7 +3276,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
ret = ftrace_process_regex(iter->hash, parser->buffer,
parser->idx, enable);
trace_parser_clear(parser);
if (ret)
if (ret < 0)
goto out_unlock;
}