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SubjectRe: [tip:tracing/urgent] tracing: Add pipe_close interface
Date
> Commit-ID:  c521efd1700a8c0f7ce26f011f5eaecca17fabfa
> Gitweb: http://git.kernel.org/tip/c521efd1700a8c0f7ce26f011f5eaecca17fabfa
> Author: Steven Rostedt <srostedt@redhat.com>
> AuthorDate: Mon, 7 Dec 2009 09:06:24 -0500
> Committer: Steven Rostedt <rostedt@goodmis.org>
> CommitDate: Mon, 7 Dec 2009 12:01:35 -0500
>
> tracing: Add pipe_close interface
>
> An ftrace plugin can add a pipe_open interface when the user opens
> trace_pipe. But if the plugin allocates something within the pipe_open
> it can not free it because there exists no pipe_close. The hook to
> the trace file open has a corresponding close. The closing of the
> trace_pipe file should also have a corresponding close.
>
> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
> ---
> kernel/trace/trace.c | 4 ++++
> kernel/trace/trace.h | 2 ++
> 2 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 874f289..f804b40 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -2898,6 +2898,10 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
> else
> cpumask_clear_cpu(iter->cpu_file, tracing_reader_cpumask);
>
> +
> + if (iter->trace->pipe_open)
> + iter->trace->pipe_close(iter);
> +

What's happen if pipe_close is NULL? Wny following straightforward check
is wrong?
I mean the above description explain pipe_close is only useful if plugin
allocate something at pipe_open. then allowing NULL seems natural.

if (iter->trace->pipe_close)
iter->trace->pipe_close(iter);

just nit.






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