From: LABBE Corentin Subject: [PATCH 3/4] crypto: caam: dma_map_sg can handle chained SG Date: Wed, 23 Sep 2015 13:55:27 +0200 Message-ID: <1443009328-12478-4-git-send-email-clabbe.montjoie@gmail.com> References: <1443009328-12478-1-git-send-email-clabbe.montjoie@gmail.com> Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org To: herbert@gondor.apana.org.au, davem@davemloft.net, catalin.vasile@freescale.com, clabbe.montjoie@gmail.com, cristian.stoica@freescale.com, fabio.estevam@freescale.com, horia.geanta@freescale.com, steve.cornelius@freescale.com, tudor.ambarus@freescale.com, vicki.milhoan@freescale.com, yanjiang.jin@windriver.com Return-path: In-Reply-To: <1443009328-12478-1-git-send-email-clabbe.montjoie@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org The caam driver use two dma_map_sg path according to SG are chained or not. Since dma_map_sg can handle both case, clean the code with all references to sg chained. Thus removing dma_map_sg_chained, dma_unmap_sg_chained and __sg_count functions. Signed-off-by: LABBE Corentin --- drivers/crypto/caam/caamalg.c | 94 +++++++++++++++------------------------- drivers/crypto/caam/caamhash.c | 55 ++++++++--------------- drivers/crypto/caam/sg_sw_sec4.h | 72 +----------------------------- 3 files changed, 53 insertions(+), 168 deletions(-) diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c index ba79d63..ad0d1ec 100644 --- a/drivers/crypto/caam/caamalg.c +++ b/drivers/crypto/caam/caamalg.c @@ -1708,11 +1708,8 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher, /* * aead_edesc - s/w-extended aead descriptor * @assoc_nents: number of segments in associated data (SPI+Seq) scatterlist - * @assoc_chained: if source is chained * @src_nents: number of segments in input scatterlist - * @src_chained: if source is chained * @dst_nents: number of segments in output scatterlist - * @dst_chained: if destination is chained * @iv_dma: dma address of iv for checking continuity and link table * @desc: h/w descriptor (variable length; must not exceed MAX_CAAM_DESCSIZE) * @sec4_sg_bytes: length of dma mapped sec4_sg space @@ -1721,11 +1718,8 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher, */ struct aead_edesc { int assoc_nents; - bool assoc_chained; int src_nents; - bool src_chained; int dst_nents; - bool dst_chained; dma_addr_t iv_dma; int sec4_sg_bytes; dma_addr_t sec4_sg_dma; @@ -1736,9 +1730,7 @@ struct aead_edesc { /* * ablkcipher_edesc - s/w-extended ablkcipher descriptor * @src_nents: number of segments in input scatterlist - * @src_chained: if source is chained * @dst_nents: number of segments in output scatterlist - * @dst_chained: if destination is chained * @iv_dma: dma address of iv for checking continuity and link table * @desc: h/w descriptor (variable length; must not exceed MAX_CAAM_DESCSIZE) * @sec4_sg_bytes: length of dma mapped sec4_sg space @@ -1747,9 +1739,7 @@ struct aead_edesc { */ struct ablkcipher_edesc { int src_nents; - bool src_chained; int dst_nents; - bool dst_chained; dma_addr_t iv_dma; int sec4_sg_bytes; dma_addr_t sec4_sg_dma; @@ -1759,18 +1749,15 @@ struct ablkcipher_edesc { static void caam_unmap(struct device *dev, struct scatterlist *src, struct scatterlist *dst, int src_nents, - bool src_chained, int dst_nents, bool dst_chained, + int dst_nents, dma_addr_t iv_dma, int ivsize, dma_addr_t sec4_sg_dma, int sec4_sg_bytes) { if (dst != src) { - dma_unmap_sg_chained(dev, src, src_nents ? : 1, DMA_TO_DEVICE, - src_chained); - dma_unmap_sg_chained(dev, dst, dst_nents ? : 1, DMA_FROM_DEVICE, - dst_chained); + dma_unmap_sg(dev, src, src_nents ? : 1, DMA_TO_DEVICE); + dma_unmap_sg(dev, dst, dst_nents ? : 1, DMA_FROM_DEVICE); } else { - dma_unmap_sg_chained(dev, src, src_nents ? : 1, - DMA_BIDIRECTIONAL, src_chained); + dma_unmap_sg(dev, src, src_nents ? : 1, DMA_BIDIRECTIONAL); } if (iv_dma) @@ -1785,8 +1772,7 @@ static void aead_unmap(struct device *dev, struct aead_request *req) { caam_unmap(dev, req->src, req->dst, - edesc->src_nents, edesc->src_chained, edesc->dst_nents, - edesc->dst_chained, 0, 0, + edesc->src_nents, edesc->dst_nents, 0, 0, edesc->sec4_sg_dma, edesc->sec4_sg_bytes); } @@ -1798,8 +1784,8 @@ static void ablkcipher_unmap(struct device *dev, int ivsize = crypto_ablkcipher_ivsize(ablkcipher); caam_unmap(dev, req->src, req->dst, - edesc->src_nents, edesc->src_chained, edesc->dst_nents, - edesc->dst_chained, edesc->iv_dma, ivsize, + edesc->src_nents, edesc->dst_nents, + edesc->iv_dma, ivsize, edesc->sec4_sg_dma, edesc->sec4_sg_bytes); } @@ -2169,22 +2155,18 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req, struct aead_edesc *edesc; int sgc; bool all_contig = true; - bool src_chained = false, dst_chained = false; int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes; unsigned int authsize = ctx->authsize; if (unlikely(req->dst != req->src)) { - src_nents = sg_count(req->src, req->assoclen + req->cryptlen, - &src_chained); + src_nents = sg_count(req->src, req->assoclen + req->cryptlen); dst_nents = sg_count(req->dst, req->assoclen + req->cryptlen + - (encrypt ? authsize : (-authsize)), - &dst_chained); + (encrypt ? authsize : (-authsize))); } else { src_nents = sg_count(req->src, req->assoclen + req->cryptlen + - (encrypt ? authsize : 0), - &src_chained); + (encrypt ? authsize : 0)); } /* Check if data are contiguous. */ @@ -2207,37 +2189,35 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req, } if (likely(req->src == req->dst)) { - sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_BIDIRECTIONAL, src_chained); + sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1, + DMA_BIDIRECTIONAL); if (unlikely(!sgc)) { dev_err(jrdev, "unable to map source\n"); kfree(edesc); return ERR_PTR(-ENOMEM); } } else { - sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_TO_DEVICE, src_chained); + sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1, + DMA_TO_DEVICE); if (unlikely(!sgc)) { dev_err(jrdev, "unable to map source\n"); kfree(edesc); return ERR_PTR(-ENOMEM); } - sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1, - DMA_FROM_DEVICE, dst_chained); + sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1, + DMA_FROM_DEVICE); if (unlikely(!sgc)) { dev_err(jrdev, "unable to map destination\n"); - dma_unmap_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_TO_DEVICE, src_chained); + dma_unmap_sg(jrdev, req->src, src_nents ? : 1, + DMA_TO_DEVICE); kfree(edesc); return ERR_PTR(-ENOMEM); } } edesc->src_nents = src_nents; - edesc->src_chained = src_chained; edesc->dst_nents = dst_nents; - edesc->dst_chained = dst_chained; edesc->sec4_sg = (void *)edesc + sizeof(struct aead_edesc) + desc_bytes; *all_contig_ptr = all_contig; @@ -2467,22 +2447,21 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request bool iv_contig = false; int sgc; int ivsize = crypto_ablkcipher_ivsize(ablkcipher); - bool src_chained = false, dst_chained = false; int sec4_sg_index; - src_nents = sg_count(req->src, req->nbytes, &src_chained); + src_nents = sg_count(req->src, req->nbytes); if (req->dst != req->src) - dst_nents = sg_count(req->dst, req->nbytes, &dst_chained); + dst_nents = sg_count(req->dst, req->nbytes); if (likely(req->src == req->dst)) { - sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_BIDIRECTIONAL, src_chained); + sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1, + DMA_BIDIRECTIONAL); } else { - sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_TO_DEVICE, src_chained); - sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1, - DMA_FROM_DEVICE, dst_chained); + sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1, + DMA_TO_DEVICE); + sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1, + DMA_FROM_DEVICE); } iv_dma = dma_map_single(jrdev, req->info, ivsize, DMA_TO_DEVICE); @@ -2511,9 +2490,7 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request } edesc->src_nents = src_nents; - edesc->src_chained = src_chained; edesc->dst_nents = dst_nents; - edesc->dst_chained = dst_chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) + desc_bytes; @@ -2646,22 +2623,21 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc( bool iv_contig = false; int sgc; int ivsize = crypto_ablkcipher_ivsize(ablkcipher); - bool src_chained = false, dst_chained = false; int sec4_sg_index; - src_nents = sg_count(req->src, req->nbytes, &src_chained); + src_nents = sg_count(req->src, req->nbytes); if (unlikely(req->dst != req->src)) - dst_nents = sg_count(req->dst, req->nbytes, &dst_chained); + dst_nents = sg_count(req->dst, req->nbytes); if (likely(req->src == req->dst)) { - sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_BIDIRECTIONAL, src_chained); + sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1, + DMA_BIDIRECTIONAL); } else { - sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_TO_DEVICE, src_chained); - sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1, - DMA_FROM_DEVICE, dst_chained); + sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1, + DMA_TO_DEVICE); + sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1, + DMA_FROM_DEVICE); } /* @@ -2690,9 +2666,7 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc( } edesc->src_nents = src_nents; - edesc->src_chained = src_chained; edesc->dst_nents = dst_nents; - edesc->dst_chained = dst_chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) + desc_bytes; diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c index 94433b9..9609f66 100644 --- a/drivers/crypto/caam/caamhash.c +++ b/drivers/crypto/caam/caamhash.c @@ -181,10 +181,9 @@ static inline dma_addr_t buf_map_to_sec4_sg(struct device *jrdev, /* Map req->src and put it in link table */ static inline void src_map_to_sec4_sg(struct device *jrdev, struct scatterlist *src, int src_nents, - struct sec4_sg_entry *sec4_sg, - bool chained) + struct sec4_sg_entry *sec4_sg) { - dma_map_sg_chained(jrdev, src, src_nents, DMA_TO_DEVICE, chained); + dma_map_sg(jrdev, src, src_nents, DMA_TO_DEVICE); sg_to_sec4_sg_last(src, src_nents, sec4_sg, 0); } @@ -585,7 +584,6 @@ badkey: * ahash_edesc - s/w-extended ahash descriptor * @dst_dma: physical mapped address of req->result * @sec4_sg_dma: physical mapped address of h/w link table - * @chained: if source is chained * @src_nents: number of segments in input scatterlist * @sec4_sg_bytes: length of dma mapped sec4_sg space * @sec4_sg: pointer to h/w link table @@ -594,7 +592,6 @@ badkey: struct ahash_edesc { dma_addr_t dst_dma; dma_addr_t sec4_sg_dma; - bool chained; int src_nents; int sec4_sg_bytes; struct sec4_sg_entry *sec4_sg; @@ -606,8 +603,7 @@ static inline void ahash_unmap(struct device *dev, struct ahash_request *req, int dst_len) { if (edesc->src_nents) - dma_unmap_sg_chained(dev, req->src, edesc->src_nents, - DMA_TO_DEVICE, edesc->chained); + dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE); if (edesc->dst_dma) dma_unmap_single(dev, edesc->dst_dma, dst_len, DMA_FROM_DEVICE); @@ -788,7 +784,6 @@ static int ahash_update_ctx(struct ahash_request *req) dma_addr_t ptr = ctx->sh_desc_update_dma; int src_nents, sec4_sg_bytes, sec4_sg_src_index; struct ahash_edesc *edesc; - bool chained = false; int ret = 0; int sh_len; @@ -797,8 +792,8 @@ static int ahash_update_ctx(struct ahash_request *req) to_hash = in_len - *next_buflen; if (to_hash) { - src_nents = __sg_count(req->src, req->nbytes - (*next_buflen), - &chained); + src_nents = sg_nents_for_len(req->src, + req->nbytes - (*next_buflen)); sec4_sg_src_index = 1 + (*buflen ? 1 : 0); sec4_sg_bytes = (sec4_sg_src_index + src_nents) * sizeof(struct sec4_sg_entry); @@ -816,7 +811,6 @@ static int ahash_update_ctx(struct ahash_request *req) } edesc->src_nents = src_nents; - edesc->chained = chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) + DESC_JOB_IO_LEN; @@ -833,8 +827,7 @@ static int ahash_update_ctx(struct ahash_request *req) if (src_nents) { src_map_to_sec4_sg(jrdev, req->src, src_nents, - edesc->sec4_sg + sec4_sg_src_index, - chained); + edesc->sec4_sg + sec4_sg_src_index); if (*next_buflen) scatterwalk_map_and_copy(next_buf, req->src, to_hash - *buflen, @@ -996,11 +989,10 @@ static int ahash_finup_ctx(struct ahash_request *req) int src_nents; int digestsize = crypto_ahash_digestsize(ahash); struct ahash_edesc *edesc; - bool chained = false; int ret = 0; int sh_len; - src_nents = __sg_count(req->src, req->nbytes, &chained); + src_nents = sg_nents_for_len(req->src, req->nbytes); sec4_sg_src_index = 1 + (buflen ? 1 : 0); sec4_sg_bytes = (sec4_sg_src_index + src_nents) * sizeof(struct sec4_sg_entry); @@ -1018,7 +1010,6 @@ static int ahash_finup_ctx(struct ahash_request *req) init_job_desc_shared(desc, ptr, sh_len, HDR_SHARE_DEFER | HDR_REVERSE); edesc->src_nents = src_nents; - edesc->chained = chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) + DESC_JOB_IO_LEN; @@ -1033,7 +1024,7 @@ static int ahash_finup_ctx(struct ahash_request *req) last_buflen); src_map_to_sec4_sg(jrdev, req->src, src_nents, edesc->sec4_sg + - sec4_sg_src_index, chained); + sec4_sg_src_index); edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg, sec4_sg_bytes, DMA_TO_DEVICE); @@ -1081,14 +1072,12 @@ static int ahash_digest(struct ahash_request *req) int src_nents, sec4_sg_bytes; dma_addr_t src_dma; struct ahash_edesc *edesc; - bool chained = false; int ret = 0; u32 options; int sh_len; - src_nents = sg_count(req->src, req->nbytes, &chained); - dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, DMA_TO_DEVICE, - chained); + src_nents = sg_count(req->src, req->nbytes); + dma_map_sg(jrdev, req->src, src_nents ? : 1, DMA_TO_DEVICE); sec4_sg_bytes = src_nents * sizeof(struct sec4_sg_entry); /* allocate space for base edesc and hw desc commands, link tables */ @@ -1102,7 +1091,6 @@ static int ahash_digest(struct ahash_request *req) DESC_JOB_IO_LEN; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->src_nents = src_nents; - edesc->chained = chained; sh_len = desc_len(sh_desc); desc = edesc->hw_desc; @@ -1228,7 +1216,6 @@ static int ahash_update_no_ctx(struct ahash_request *req) struct ahash_edesc *edesc; u32 *desc, *sh_desc = ctx->sh_desc_update_first; dma_addr_t ptr = ctx->sh_desc_update_first_dma; - bool chained = false; int ret = 0; int sh_len; @@ -1236,8 +1223,8 @@ static int ahash_update_no_ctx(struct ahash_request *req) to_hash = in_len - *next_buflen; if (to_hash) { - src_nents = __sg_count(req->src, req->nbytes - (*next_buflen), - &chained); + src_nents = sg_nents_for_len(req->src, + req->nbytes - (*next_buflen)); sec4_sg_bytes = (1 + src_nents) * sizeof(struct sec4_sg_entry); @@ -1254,7 +1241,6 @@ static int ahash_update_no_ctx(struct ahash_request *req) } edesc->src_nents = src_nents; - edesc->chained = chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) + DESC_JOB_IO_LEN; @@ -1263,7 +1249,7 @@ static int ahash_update_no_ctx(struct ahash_request *req) state->buf_dma = buf_map_to_sec4_sg(jrdev, edesc->sec4_sg, buf, *buflen); src_map_to_sec4_sg(jrdev, req->src, src_nents, - edesc->sec4_sg + 1, chained); + edesc->sec4_sg + 1); if (*next_buflen) { scatterwalk_map_and_copy(next_buf, req->src, to_hash - *buflen, @@ -1343,11 +1329,10 @@ static int ahash_finup_no_ctx(struct ahash_request *req) int sec4_sg_bytes, sec4_sg_src_index, src_nents; int digestsize = crypto_ahash_digestsize(ahash); struct ahash_edesc *edesc; - bool chained = false; int sh_len; int ret = 0; - src_nents = __sg_count(req->src, req->nbytes, &chained); + src_nents = sg_nents_for_len(req->src, req->nbytes); sec4_sg_src_index = 2; sec4_sg_bytes = (sec4_sg_src_index + src_nents) * sizeof(struct sec4_sg_entry); @@ -1365,7 +1350,6 @@ static int ahash_finup_no_ctx(struct ahash_request *req) init_job_desc_shared(desc, ptr, sh_len, HDR_SHARE_DEFER | HDR_REVERSE); edesc->src_nents = src_nents; - edesc->chained = chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) + DESC_JOB_IO_LEN; @@ -1374,8 +1358,7 @@ static int ahash_finup_no_ctx(struct ahash_request *req) state->buf_dma, buflen, last_buflen); - src_map_to_sec4_sg(jrdev, req->src, src_nents, edesc->sec4_sg + 1, - chained); + src_map_to_sec4_sg(jrdev, req->src, src_nents, edesc->sec4_sg + 1); edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg, sec4_sg_bytes, DMA_TO_DEVICE); @@ -1429,7 +1412,6 @@ static int ahash_update_first(struct ahash_request *req) dma_addr_t src_dma; u32 options; struct ahash_edesc *edesc; - bool chained = false; int ret = 0; int sh_len; @@ -1438,10 +1420,8 @@ static int ahash_update_first(struct ahash_request *req) to_hash = req->nbytes - *next_buflen; if (to_hash) { - src_nents = sg_count(req->src, req->nbytes - (*next_buflen), - &chained); - dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, - DMA_TO_DEVICE, chained); + src_nents = sg_count(req->src, req->nbytes - (*next_buflen)); + dma_map_sg(jrdev, req->src, src_nents ? : 1, DMA_TO_DEVICE); sec4_sg_bytes = src_nents * sizeof(struct sec4_sg_entry); /* @@ -1457,7 +1437,6 @@ static int ahash_update_first(struct ahash_request *req) } edesc->src_nents = src_nents; - edesc->chained = chained; edesc->sec4_sg_bytes = sec4_sg_bytes; edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) + DESC_JOB_IO_LEN; diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h index 18cd6d1..12ec661 100644 --- a/drivers/crypto/caam/sg_sw_sec4.h +++ b/drivers/crypto/caam/sg_sw_sec4.h @@ -69,81 +69,13 @@ static inline struct sec4_sg_entry *sg_to_sec4_sg_len( return sec4_sg_ptr - 1; } -/* count number of elements in scatterlist */ -static inline int __sg_count(struct scatterlist *sg_list, int nbytes, - bool *chained) -{ - struct scatterlist *sg = sg_list; - int sg_nents = 0; - - while (nbytes > 0) { - sg_nents++; - nbytes -= sg->length; - if (!sg_is_last(sg) && (sg + 1)->length == 0) - *chained = true; - sg = sg_next(sg); - } - - return sg_nents; -} - /* derive number of elements in scatterlist, but return 0 for 1 */ -static inline int sg_count(struct scatterlist *sg_list, int nbytes, - bool *chained) +static inline int sg_count(struct scatterlist *sg_list, int nbytes) { - int sg_nents = __sg_count(sg_list, nbytes, chained); + int sg_nents = sg_nents_for_len(sg_list, nbytes); if (likely(sg_nents == 1)) return 0; return sg_nents; } - -static inline void dma_unmap_sg_chained( - struct device *dev, struct scatterlist *sg, unsigned int nents, - enum dma_data_direction dir, bool chained) -{ - if (unlikely(chained)) { - int i; - struct scatterlist *tsg = sg; - - /* - * Use a local copy of the sg pointer to avoid moving the - * head of the list pointed to by sg as we walk the list. - */ - for (i = 0; i < nents; i++) { - dma_unmap_sg(dev, tsg, 1, dir); - tsg = sg_next(tsg); - } - } else if (nents) { - dma_unmap_sg(dev, sg, nents, dir); - } -} - -static inline int dma_map_sg_chained( - struct device *dev, struct scatterlist *sg, unsigned int nents, - enum dma_data_direction dir, bool chained) -{ - if (unlikely(chained)) { - int i; - struct scatterlist *tsg = sg; - - /* - * Use a local copy of the sg pointer to avoid moving the - * head of the list pointed to by sg as we walk the list. - */ - for (i = 0; i < nents; i++) { - if (!dma_map_sg(dev, tsg, 1, dir)) { - dma_unmap_sg_chained(dev, sg, i, dir, - chained); - nents = 0; - break; - } - - tsg = sg_next(tsg); - } - } else - nents = dma_map_sg(dev, sg, nents, dir); - - return nents; -} -- 2.4.9