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This ensures the mm remains valid > for the entire SVA bind/unbind lifetime. > > Fixes: be462c97b7df ("accel/amdxdna: Add hardware context") > Signed-off-by: Lizhi Hou Reviewed-by: Mario Limonciello (AMD) > --- > drivers/accel/amdxdna/amdxdna_pci_drv.c | 3 +++ > drivers/accel/amdxdna/amdxdna_pci_drv.h | 1 + > 2 files changed, 4 insertions(+) > > diff --git a/drivers/accel/amdxdna/amdxdna_pci_drv.c b/drivers/accel/amdxdna/amdxdna_pci_drv.c > index 45f5c12fc67f..fdefd9ec2066 100644 > --- a/drivers/accel/amdxdna/amdxdna_pci_drv.c > +++ b/drivers/accel/amdxdna/amdxdna_pci_drv.c > @@ -82,6 +82,8 @@ static int amdxdna_drm_open(struct drm_device *ddev, struct drm_file *filp) > ret = -ENODEV; > goto unbind_sva; > } > + client->mm = current->mm; > + mmgrab(client->mm); > init_srcu_struct(&client->hwctx_srcu); > xa_init_flags(&client->hwctx_xa, XA_FLAGS_ALLOC); > mutex_init(&client->mm_lock); > @@ -116,6 +118,7 @@ static void amdxdna_client_cleanup(struct amdxdna_client *client) > drm_gem_object_put(to_gobj(client->dev_heap)); > > iommu_sva_unbind_device(client->sva); > + mmdrop(client->mm); > > kfree(client); > } > diff --git a/drivers/accel/amdxdna/amdxdna_pci_drv.h b/drivers/accel/amdxdna/amdxdna_pci_drv.h > index 6580cb5ec7e2..f08406b8fdf9 100644 > --- a/drivers/accel/amdxdna/amdxdna_pci_drv.h > +++ b/drivers/accel/amdxdna/amdxdna_pci_drv.h > @@ -130,6 +130,7 @@ struct amdxdna_client { > > struct iommu_sva *sva; > int pasid; > + struct mm_struct *mm; > }; > > #define amdxdna_for_each_hwctx(client, hwctx_id, entry) \