[S390] Fix smsgiucv init on no iucv machines
smsgiucv is a driver that relies on iucv to work properly. If iucv ans smsgiucv are compiled into the kernel and run on an lpar the following scenario happens: iucv is initialized early as a subsystem. It checks for z/VM and returns with EPROTONOTSUPPORT. Later smsgiucv tries to run driver_register with iucv_bus as bus. As this bus is not initialized the driver core and list debugging issue several warnings and oopses. Solution is to let smsgiucv also check for z/VM and return EPROTONOTSUPPORT as well. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -148,6 +148,10 @@ static int __init smsg_init(void)
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{
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int rc;
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if (!MACHINE_IS_VM) {
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rc = -EPROTONOSUPPORT;
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goto out;
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}
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rc = driver_register(&smsg_driver);
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if (rc != 0)
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goto out;
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