Commit 2f609a03 authored by wanghaibin's avatar wanghaibin Committed by Christoffer Dall
Browse files

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



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: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarwanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent 0a0d389e

virt/kvm/arm/vgic/vgic-its.c

+20 −21
Original line number Diff line number Diff line
@@ -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);

	}



	list_for_each_safe(cur, temp, &its->collection_list) {

		struct its_collection *coll;

	vgic_its_free_device_list(kvm, its);

	vgic_its_free_collection_list(kvm, its);



		coll = list_entry(cur, struct its_collection, coll_list);

		list_del(cur);

		kfree(coll);

	}

	mutex_unlock(&its->its_lock);



	kfree(its);

}

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