sched_ext: Set errno on ENABLING -> ENABLED transition failure

If the SCX_ENABLING -> SCX_ENABLED cmpxchg at the tail of
scx_root_enable_workfn() fails, the function jumps to err_disable
without setting ret. At that point ret still holds the return value
of the last successful __scx_init_task() call, which is 0, so the
err_disable fallback reports the meaningless message:

  scx_root_enable() failed (0)

Set ret = -EBUSY, consistent with the other enable-state guards at
the top of the same function, so the fallback always reports a real
errno.

Signed-off-by: Liang Luo <luoliang@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

0 files changed, 0 insertions, 0 deletions