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KVM: arm/arm64: vgic-its: New helper functions to free the caches

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We create two new functions that free the device and
collection lists. They are currently called by vgic_its_destroy()
and other callers will be added in subsequent patches.

We also remove the check on its->device_list.next.
Lists are initialized in vgic_create_its() and the device
is added to the device list only if this latter succeeds.

vgic_its_destroy is the device destroy ops. This latter is called
by kvm_destroy_devices() which loops on all created devices. So
at this point the list is initialized.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: wanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
wanghaibin 2017-10-26 17:23:08 +02:00 committed by Christoffer Dall
parent 0a0d389ea6
commit 2f609a0339
1 changed files with 20 additions and 21 deletions
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41
virt/kvm/arm/vgic/vgic-its.c
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@ -913,6 +913,24 @@ static void vgic_its_free_device(struct kvm *kvm, struct its_device *device)
kfree(device);
}
/* its lock must be held */
static void vgic_its_free_device_list(struct kvm *kvm, struct vgic_its *its)
{
struct its_device *cur, *temp;
list_for_each_entry_safe(cur, temp, &its->device_list, dev_list)
vgic_its_free_device(kvm, cur);
}
/* its lock must be held */
static void vgic_its_free_collection_list(struct kvm *kvm, struct vgic_its *its)
{
struct its_collection *cur, *temp;
list_for_each_entry_safe(cur, temp, &its->collection_list, coll_list)
vgic_its_free_collection(its, cur->collection_id);
}
/* Must be called with its_lock mutex held */
static struct its_device *vgic_its_alloc_device(struct vgic_its *its,
u32 device_id, gpa_t itt_addr,
@ -1619,32 +1637,13 @@ static void vgic_its_destroy(struct kvm_device *kvm_dev)
{
struct kvm *kvm = kvm_dev->kvm;
struct vgic_its *its = kvm_dev->private;
struct list_head *cur, *temp;
/*
* We may end up here without the lists ever having been initialized.
* Check this and bail out early to avoid dereferencing a NULL pointer.
*/
if (!its->device_list.next)
return;
mutex_lock(&its->its_lock);
list_for_each_safe(cur, temp, &its->device_list) {
struct its_device *dev;
dev = list_entry(cur, struct its_device, dev_list);
vgic_its_free_device(kvm, dev);
}
vgic_its_free_device_list(kvm, its);
vgic_its_free_collection_list(kvm, its);
list_for_each_safe(cur, temp, &its->collection_list) {
struct its_collection *coll;
coll = list_entry(cur, struct its_collection, coll_list);
list_del(cur);
kfree(coll);
}
mutex_unlock(&its->its_lock);
kfree(its);
}