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tracing/filters: don't remove old filters when failed to write subsys…
…->filter If writing subsys->filter returns EINVAL or ENOSPC, the original filters in subsys/ and subsys/events/ will be removed. This is definitely wrong. [ Impact: fix filter setting semantics on error condition ] Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <49ED8DD2.2070700@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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