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cpuidle-haltpoll: return -ENODEV on modinit failure

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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: fa86ee90eb ("add cpuidle-haltpoll driver")
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Joao Martins 2019-09-08 00:45:23 +01:00 committed by Rafael J. Wysocki
parent 7321440829
commit 5cc59f597c
1 changed files with 1 additions and 1 deletions
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2
drivers/cpuidle/cpuidle-haltpoll.c
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@ -99,7 +99,7 @@ static int __init haltpoll_init(void)
cpuidle_poll_state_init(drv);
if (!kvm_para_available())
return 0;
return -ENODEV;
ret = cpuidle_register_driver(drv);
if (ret < 0)