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drm/i915/kvmgt: Handle kzalloc failure 

Out-of-memory error must be handled correctly.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Changbin Du 2018-03-12 15:12:34 +08:00 committed by Zhenyu Wang
parent 84f69ba081
commit 5cd4223ea3
1 changed files with 15 additions and 7 deletions
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22
drivers/gpu/drm/i915/gvt/kvmgt.c
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@ -184,7 +184,7 @@ static struct gvt_dma *__gvt_cache_find_gfn(struct intel_vgpu *vgpu, gfn_t gfn)
return NULL;
}
static void __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
static int __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
dma_addr_t dma_addr)
{
struct gvt_dma *new, *itr;
@ -192,7 +192,7 @@ static void __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
new = kzalloc(sizeof(struct gvt_dma), GFP_KERNEL);
if (!new)
return;
return -ENOMEM;
new->vgpu = vgpu;
new->gfn = gfn;
@ -229,6 +229,7 @@ static void __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
rb_insert_color(&new->dma_addr_node, &vgpu->vdev.dma_addr_cache);
vgpu->vdev.nr_cache_entries++;
return 0;
}
static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
@ -1586,11 +1587,12 @@ int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
entry = __gvt_cache_find_gfn(info->vgpu, gfn);
if (!entry) {
ret = gvt_dma_map_page(vgpu, gfn, dma_addr);
if (ret) {
mutex_unlock(&info->vgpu->vdev.cache_lock);
return ret;
}
__gvt_cache_add(info->vgpu, gfn, *dma_addr);
if (ret)
goto err_unlock;
ret = __gvt_cache_add(info->vgpu, gfn, *dma_addr);
if (ret)
goto err_unmap;
} else {
kref_get(&entry->ref);
*dma_addr = entry->dma_addr;
@ -1598,6 +1600,12 @@ int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
mutex_unlock(&info->vgpu->vdev.cache_lock);
return 0;
err_unmap:
gvt_dma_unmap_page(vgpu, gfn, *dma_addr);
err_unlock:
mutex_unlock(&info->vgpu->vdev.cache_lock);
return ret;
}
static void __gvt_dma_release(struct kref *ref)