[PATCHv3 1/2] nvme-pci: fix dma_vecs leak on p2p memory

[Christoph Hellwig]

On Wed, May 20, 2026 at 10:49:52AM -0700, Keith Busch wrote:
> From: Keith Busch <kbusch at kernel.org>
> 
> We don't unmap P2P memory, so allocating the dma_vec for it was being
> leaked on completion.
> 
> Fixes: b8b7570a7ec87 ("nvme-pci: fix dma unmapping when using PRPs and not using the IOVA mapping")
> Signed-off-by: Keith Busch <kbusch at kernel.org>
> ---
>  drivers/nvme/host/pci.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 139a10cd687f9..744b388eea956 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -966,7 +966,8 @@ static bool nvme_pci_prp_save_mapping(struct request *req,
>  {
>  	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
>  
> -	if (dma_use_iova(&iod->dma_state) || !dma_need_unmap(dma_dev))
> +	if (dma_use_iova(&iod->dma_state) || !dma_need_unmap(dma_dev) ||
> +	    iod->flags & IOD_DATA_P2P)

Missing braces around the & for our usual style?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>