40b0b3f8fb2d8 (Thomas Gleixner 2019-06-03 07:44:46 +0200 1) // SPDX-License-Identifier: GPL-2.0-only
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 2) /*
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 3) * Copyright (C) 2015 Robert Jarzmik <robert.jarzmik@free.fr>
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 4) *
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 5) * Scatterlist splitting helpers.
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 6) */
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 7)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 8) #include <linux/scatterlist.h>
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 9) #include <linux/slab.h>
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 10)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 11) struct sg_splitter {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 12) struct scatterlist *in_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 13) int nents;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 14) off_t skip_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 15) unsigned int length_last_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 16)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 17) struct scatterlist *out_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 18) };
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 19)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 20) static int sg_calculate_split(struct scatterlist *in, int nents, int nb_splits,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 21) off_t skip, const size_t *sizes,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 22) struct sg_splitter *splitters, bool mapped)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 23) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 24) int i;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 25) unsigned int sglen;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 26) size_t size = sizes[0], len;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 27) struct sg_splitter *curr = splitters;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 28) struct scatterlist *sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 29)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 30) for (i = 0; i < nb_splits; i++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 31) splitters[i].in_sg0 = NULL;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 32) splitters[i].nents = 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 33) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 34)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 35) for_each_sg(in, sg, nents, i) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 36) sglen = mapped ? sg_dma_len(sg) : sg->length;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 37) if (skip > sglen) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 38) skip -= sglen;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 39) continue;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 40) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 41)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 42) len = min_t(size_t, size, sglen - skip);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 43) if (!curr->in_sg0) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 44) curr->in_sg0 = sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 45) curr->skip_sg0 = skip;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 46) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 47) size -= len;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 48) curr->nents++;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 49) curr->length_last_sg = len;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 50)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 51) while (!size && (skip + len < sglen) && (--nb_splits > 0)) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 52) curr++;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 53) size = *(++sizes);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 54) skip += len;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 55) len = min_t(size_t, size, sglen - skip);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 56)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 57) curr->in_sg0 = sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 58) curr->skip_sg0 = skip;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 59) curr->nents = 1;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 60) curr->length_last_sg = len;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 61) size -= len;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 62) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 63) skip = 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 64)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 65) if (!size && --nb_splits > 0) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 66) curr++;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 67) size = *(++sizes);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 68) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 69)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 70) if (!nb_splits)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 71) break;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 72) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 73)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 74) return (size || !splitters[0].in_sg0) ? -EINVAL : 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 75) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 76)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 77) static void sg_split_phys(struct sg_splitter *splitters, const int nb_splits)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 78) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 79) int i, j;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 80) struct scatterlist *in_sg, *out_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 81) struct sg_splitter *split;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 82)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 83) for (i = 0, split = splitters; i < nb_splits; i++, split++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 84) in_sg = split->in_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 85) out_sg = split->out_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 86) for (j = 0; j < split->nents; j++, out_sg++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 87) *out_sg = *in_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 88) if (!j) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 89) out_sg->offset += split->skip_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 90) out_sg->length -= split->skip_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 91) } else {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 92) out_sg->offset = 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 93) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 94) sg_dma_address(out_sg) = 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 95) sg_dma_len(out_sg) = 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 96) in_sg = sg_next(in_sg);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 97) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 98) out_sg[-1].length = split->length_last_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 99) sg_mark_end(out_sg - 1);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 100) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 101) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 102)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 103) static void sg_split_mapped(struct sg_splitter *splitters, const int nb_splits)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 104) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 105) int i, j;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 106) struct scatterlist *in_sg, *out_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 107) struct sg_splitter *split;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 108)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 109) for (i = 0, split = splitters; i < nb_splits; i++, split++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 110) in_sg = split->in_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 111) out_sg = split->out_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 112) for (j = 0; j < split->nents; j++, out_sg++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 113) sg_dma_address(out_sg) = sg_dma_address(in_sg);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 114) sg_dma_len(out_sg) = sg_dma_len(in_sg);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 115) if (!j) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 116) sg_dma_address(out_sg) += split->skip_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 117) sg_dma_len(out_sg) -= split->skip_sg0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 118) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 119) in_sg = sg_next(in_sg);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 120) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 121) sg_dma_len(--out_sg) = split->length_last_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 122) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 123) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 124)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 125) /**
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 126) * sg_split - split a scatterlist into several scatterlists
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 127) * @in: the input sg list
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 128) * @in_mapped_nents: the result of a dma_map_sg(in, ...), or 0 if not mapped.
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 129) * @skip: the number of bytes to skip in the input sg list
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 130) * @nb_splits: the number of desired sg outputs
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 131) * @split_sizes: the respective size of each output sg list in bytes
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 132) * @out: an array where to store the allocated output sg lists
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 133) * @out_mapped_nents: the resulting sg lists mapped number of sg entries. Might
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 134) * be NULL if sglist not already mapped (in_mapped_nents = 0)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 135) * @gfp_mask: the allocation flag
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 136) *
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 137) * This function splits the input sg list into nb_splits sg lists, which are
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 138) * allocated and stored into out.
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 139) * The @in is split into :
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 140) * - @out[0], which covers bytes [@skip .. @skip + @split_sizes[0] - 1] of @in
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 141) * - @out[1], which covers bytes [@skip + split_sizes[0] ..
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 142) * @skip + @split_sizes[0] + @split_sizes[1] -1]
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 143) * etc ...
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 144) * It will be the caller's duty to kfree() out array members.
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 145) *
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 146) * Returns 0 upon success, or error code
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 147) */
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 148) int sg_split(struct scatterlist *in, const int in_mapped_nents,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 149) const off_t skip, const int nb_splits,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 150) const size_t *split_sizes,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 151) struct scatterlist **out, int *out_mapped_nents,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 152) gfp_t gfp_mask)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 153) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 154) int i, ret;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 155) struct sg_splitter *splitters;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 156)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 157) splitters = kcalloc(nb_splits, sizeof(*splitters), gfp_mask);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 158) if (!splitters)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 159) return -ENOMEM;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 160)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 161) ret = sg_calculate_split(in, sg_nents(in), nb_splits, skip, split_sizes,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 162) splitters, false);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 163) if (ret < 0)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 164) goto err;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 165)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 166) ret = -ENOMEM;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 167) for (i = 0; i < nb_splits; i++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 168) splitters[i].out_sg = kmalloc_array(splitters[i].nents,
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 169) sizeof(struct scatterlist),
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 170) gfp_mask);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 171) if (!splitters[i].out_sg)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 172) goto err;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 173) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 174)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 175) /*
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 176) * The order of these 3 calls is important and should be kept.
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 177) */
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 178) sg_split_phys(splitters, nb_splits);
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 179) if (in_mapped_nents) {
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 180) ret = sg_calculate_split(in, in_mapped_nents, nb_splits, skip,
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 181) split_sizes, splitters, true);
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 182) if (ret < 0)
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 183) goto err;
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 184) sg_split_mapped(splitters, nb_splits);
79e178f4383a3 (Zhou Wang 2019-07-24 11:54:23 +0800 185) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 186)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 187) for (i = 0; i < nb_splits; i++) {
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 188) out[i] = splitters[i].out_sg;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 189) if (out_mapped_nents)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 190) out_mapped_nents[i] = splitters[i].nents;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 191) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 192)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 193) kfree(splitters);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 194) return 0;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 195)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 196) err:
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 197) for (i = 0; i < nb_splits; i++)
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 198) kfree(splitters[i].out_sg);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 199) kfree(splitters);
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 200) return ret;
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 201) }
f8bcbe62acd0e (Robert Jarzmik 2015-08-08 10:44:10 +0200 202) EXPORT_SYMBOL(sg_split);
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