Re: [PATCH 01/11] [BUGFIX] tracing: Return 0 if event_enable_funcsucceeded

[Steven Rostedt]

On Thu, 2013-05-09 at 14:44 +0900, Masami Hiramatsu wrote:
> Return 0 instead of the number of activated ftrace if
> event_enable_func succeeded and return an error code if failed,
> beacuse 0 is success code at caller (ftrace_regex_write).
> 
> Without this fix, writing enable_event trigger on set_ftrace_filter
> always doesn't work, since event_enable_func returns 1 to
> ftrace_regex_write, it consumes 1 byte and pass input string
> without the first character again. This makes event_enable_func
> fail and disables event entry.
> 

Ah, this actually fixes two bugs! :-)

A typo will be considered success, but it also sends back to the user
that it only wrote one byte!

-- Steve


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