[lvc-project] [PATCH v5] scsi: fill in DMA padding bytes in scsi_alloc_sgtables

[Fedor Pchelkin]

On Mon, 29. Jun 01:52, Petr Vaganov wrote:
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 22e2e3223..686cef240 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1187,8 +1187,10 @@ blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd)
>  	if (blk_rq_bytes(rq) & rq->q->limits.dma_pad_mask) {
>  		unsigned int pad_len =
>  			(rq->q->limits.dma_pad_mask & ~blk_rq_bytes(rq)) + 1;
> +		unsigned int data_len = last_sg->length;
>  
>  		last_sg->length += pad_len;
> +		sg_zero_buffer(last_sg, 1, pad_len, data_len);

Поясните, почему здесь '1' на месте @nents, а не sg_nents(last_sg), к
примеру?

>  		cmd->extra_len += pad_len;
>  	}