[libata] restore sg on DMA mapping failure
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@ -2622,8 +2622,11 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
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dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
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sg->length, dir);
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if (dma_mapping_error(dma_address))
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if (dma_mapping_error(dma_address)) {
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/* restore sg */
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sg->length += qc->pad_len;
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return -1;
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}
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sg_dma_address(sg) = dma_address;
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sg_dma_len(sg) = sg->length;
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@ -2694,8 +2697,11 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
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dir = qc->dma_dir;
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n_elem = dma_map_sg(ap->host_set->dev, sg, qc->n_elem, dir);
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if (n_elem < 1)
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if (n_elem < 1) {
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/* restore last sg */
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lsg->length += qc->pad_len;
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return -1;
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}
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DPRINTK("%d sg elements mapped\n", n_elem);
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