linux-kernel - Re: [PATCH 01/11] [BUGFIX] tracing: Return 0 if event_enable

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Date:	Thu, 09 May 2013 11:21:15 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	yrl.pp-manager.tt@...achi.com, Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Tom Zanussi <tom.zanussi@...el.com>
Subject: Re: [PATCH 01/11] [BUGFIX] tracing: Return 0 if event_enable_func
 succeeded

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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