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Commit 537a95d9 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

[libata] restore sg on DMA mapping failure

parent fecb4a0c

drivers/scsi/libata-core.c

+8 −2
Original line number Diff line number Diff line
@@ -2622,8 +2622,11 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc) 


	dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,

				     sg->length, dir);

	if (dma_mapping_error(dma_address))

	if (dma_mapping_error(dma_address)) {

		/* restore sg */

		sg->length += qc->pad_len;

		return -1;

	}



	sg_dma_address(sg) = dma_address;

	sg_dma_len(sg) = sg->length;
@@ -2694,8 +2697,11 @@ static int ata_sg_setup(struct ata_queued_cmd *qc) 


	dir = qc->dma_dir;

	n_elem = dma_map_sg(ap->host_set->dev, sg, qc->n_elem, dir);

	if (n_elem < 1)

	if (n_elem < 1) {

		/* restore last sg */

		lsg->length += qc->pad_len;

		return -1;

	}



	DPRINTK("%d sg elements mapped\n", n_elem);