Re: [PATCH V1] accel/amdxdna: Skip unmapped range in aie2_populate_range()

[Max Zhen <max.zhen@amd.com>]

On 8/12/2026 Wed 13:56, Lizhi Hou wrote:
> aie2_populate_range() incorrectly failed jobs for BOs with multiple
> mmaps: if the unmapped entry appeared first in umap_list, the loop would
> pick it up, call hmm_range_fault() on a gone VMA, and return -EFAULT
> without ever trying the remaining valid mapps.
> 
> Fix it by skipping unmapped entries. After the loop, if the map list is
> empty or all maps are valid, map_invalid can be cleared normally.
> 
> Fixes: e486147c912f ("accel/amdxdna: Add BO import and export")
> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Reviewed-by: Max Zhen <max.zhen@amd.com>
> ---
>   drivers/accel/amdxdna/aie2_ctx.c | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/accel/amdxdna/aie2_ctx.c b/drivers/accel/amdxdna/aie2_ctx.c
> index 4b3a62aa8798..8d9c283f606a 100644
> --- a/drivers/accel/amdxdna/aie2_ctx.c
> +++ b/drivers/accel/amdxdna/aie2_ctx.c
> @@ -1052,6 +1052,16 @@ static int aie2_populate_range(struct amdxdna_gem_obj *abo)
>   	found = false;
>   	down_write(&xdna->notifier_lock);
>   	list_for_each_entry(mapp, &abo->mem.umap_list, node) {
> +		/*
> +		 * Skip entries that have already been unmapped.
> +		 *
> +		 * If userspace unmaps the address and later submits I/O using
> +		 * it, the IOMMU will reject the access and report a fault.
> +		 * Ignore such entries here.
> +		 */
> +		if (mapp->unmapped)
> +			continue;
> +
>   		if (mapp->invalid && kref_get_unless_zero(&mapp->refcnt)) {
>   			found = true;
>   			break;
> @@ -1059,6 +1069,12 @@ static int aie2_populate_range(struct amdxdna_gem_obj *abo)
>   	}
>   
>   	if (!found) {
> +		/*
> +		 * This also covers the case where all mappings have been
> +		 * removed. There are no invalid mappings left to process.
> +		 * Any subsequent I/O using the unmapped address will be
> +		 * rejected by the IOMMU.
> +		 */
>   		abo->mem.map_invalid = false;
>   		up_write(&xdna->notifier_lock);
>   		return 0;