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tracing: Clear parser->idx if only spaces are read 

If only spaces were read while parsing the next string, then parser->idx should be
cleared in order to make trace_parser_loaded() return false.

Link: http://lkml.kernel.org/r/1516093350-12045-3-git-send-email-changbin.du@intel.com

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Changbin Du 2018-01-16 17:02:29 +08:00 committed by Steven Rostedt (VMware)
parent 921a7acd85
commit 76638d9650
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace.c
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@ -1236,14 +1236,14 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
cnt--;
}
parser->idx = 0;
/* only spaces were written */
if (isspace(ch) || !ch) {
*ppos += read;
ret = read;
goto out;
}
parser->idx = 0;
}
/* read the non-space input */