Messages in this thread Patch in this message | | | From | Joao Martins <> | Subject | [PATCH v3 3/4] cpuidle-haltpoll: return -ENODEV on modinit failure | Date | Sun, 8 Sep 2019 00:45:23 +0100 |
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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: fa86ee90eb11 ("add cpuidle-haltpoll driver") Signed-off-by: Joao Martins <joao.m.martins@oracle.com> --- v2: * Added Fixes tag --- drivers/cpuidle/cpuidle-haltpoll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c index 519e90d125cf..7a0239ef717e 100644 --- a/drivers/cpuidle/cpuidle-haltpoll.c +++ b/drivers/cpuidle/cpuidle-haltpoll.c @@ -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) -- 2.17.1
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