perf probe: Propagate error code when write(2) failed
When it failed to write probe commands to the probe_event file in debugfs, it needs to propagate the error code properly. Current code blindly uses the return value of the write(2) so it always uses -1 (-EPERM) and it might confuse users. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1420886028-15135-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -2052,9 +2052,11 @@ static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
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pr_debug("Writing event: %s\n", buf);
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if (!probe_event_dry_run) {
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ret = write(fd, buf, strlen(buf));
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if (ret <= 0)
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if (ret <= 0) {
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ret = -errno;
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pr_warning("Failed to write event: %s\n",
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strerror_r(errno, sbuf, sizeof(sbuf)));
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}
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}
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free(buf);
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return ret;
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