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    SubjectRe: PATCH? trace_remove_event_call() should fail if call is active
    On 07/03, Steven Rostedt wrote:
    >
    > On Wed, 2013-07-03 at 16:34 -0400, Steven Rostedt wrote:
    > > OK, what about the below patch, followed by an updated version of your
    > > patch. I'll send that as a reply to this one.
    >
    > This is a modification of your patch:

    Thanks.

    > If you like it, please add a proper change log and SOB tag. Oh, and we
    > need to still update trace_kprobes.c

    and trace_uprobes.c. Please find the changelog below.


    tracing: trace_remove_event_call() should fail if call/file is in use

    Change trace_remove_event_call(call) to return the error if this
    call is active. This is what the callers assume but can't verify
    outside of the tracing locks. Both trace_kprobe.c/trace_uprobe.c
    need the additional changes, unregister_trace_probe() should abort
    if trace_remove_event_call() fails.

    We also check TRACE_EVENT_FL_REF_MASK to ensure that nobody opened
    the files we are going to remove, these means that nobody can access
    the soon-to-be-freed ftrace_event_file/call via filp->private_data.

    Signed-off-by: Oleg Nesterov <oleg@redhat.com>



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