cpuidle-haltpoll: return -ENODEV on modinit failure
commit 26ee75559bd10f07b5b99e40e05df5f0d7d7b7ec upstream When a user loads cpuidle-haltpoll on a non KVM guest the module will successfully load, even though idle driver registration didn't take place. We should instead return -ENODEV signaling the user that the driver can't be loaded, like other error paths in haltpoll_init(). An example of such error paths is when we return -EBUSY when attempting to register an idle driver when it had one already (e.g. intel_idle loads at boot and then we attempt to insert module cpuidle-haltpoll). Fixes: fa86ee90eb11 ("add cpuidle-haltpoll driver") Signed-off-by: NJoao Martins <joao.m.martins@oracle.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: NYihao Wu <wuyihao@linux.alibaba.com> Acked-by: NMichael Wang <yun.wang@linux.alibaba.com>
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