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Message-ID: <1358916512.21576.108.camel@gandalf.local.home>
Date: Tue, 22 Jan 2013 23:48:32 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
Al Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] Hack to use mkdir/rmdir in debugfs
On Tue, 2013-01-22 at 23:44 -0500, Steven Rostedt wrote:
> + ret = event_trace_add_tracer(tr->dir, tr);
> + if (ret)
> + goto out_free_tr;
> +
> + init_tracer_debugfs(tr, tr->dir);
> +
> + mutex_unlock(&trace_types_lock);
> +
> + list_add(&tr->list, &ftrace_trace_arrays);
I just noticed this bug :-)
The list_add() needs to be inside the mutex protection. This code use to
be within the trace_new_instance_write(), and I just moved it into its
own function. Must have been where I screwed up.
-- Steve
> +
> + return 0;
> +
> + out_free_tr:
> + if (tr->buffer)
> + ring_buffer_free(tr->buffer);
> + kfree(tr->name);
> + kfree(tr);
> +
> + out_unlock:
> + mutex_unlock(&trace_types_lock);
> +
> + return ret;
> +
> +}
> +
--
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