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authorGregory Haskins <ghaskins@novell.com>2009-07-07 17:08:44 -0400
committerAvi Kivity <avi@redhat.com>2009-09-10 08:33:12 +0300
commit090b7aff27120cdae76a346a70db394844fea598 (patch)
tree4676410f57a44d7c0fba9d791fc77d7850ad1d51 /arch/x86/kvm/i8259.c
parentfef07aae9cd9ed82f94228c311b35360f1f38902 (diff)
downloadop-kernel-dev-090b7aff27120cdae76a346a70db394844fea598.zip
op-kernel-dev-090b7aff27120cdae76a346a70db394844fea598.tar.gz
KVM: make io_bus interface more robust
Today kvm_io_bus_regsiter_dev() returns void and will internally BUG_ON if it fails. We want to create dynamic MMIO/PIO entries driven from userspace later in the series, so we need to enhance the code to be more robust with the following changes: 1) Add a return value to the registration function 2) Fix up all the callsites to check the return code, handle any failures, and percolate the error up to the caller. 3) Add an unregister function that collapses holes in the array Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/i8259.c')
-rw-r--r--arch/x86/kvm/i8259.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index e4bcbdd..daf4606 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -539,6 +539,8 @@ static const struct kvm_io_device_ops picdev_ops = {
struct kvm_pic *kvm_create_pic(struct kvm *kvm)
{
struct kvm_pic *s;
+ int ret;
+
s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL);
if (!s)
return NULL;
@@ -555,6 +557,11 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
* Initialize PIO device
*/
kvm_iodevice_init(&s->dev, &picdev_ops);
- kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &s->dev);
+ ret = kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &s->dev);
+ if (ret < 0) {
+ kfree(s);
+ return NULL;
+ }
+
return s;
}
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