+static int is_newsg(struct scatterlist *sgl, unsigned int *newents)
+{
+ int nents = 0;
+ int ret = 0;
+
+ while (sgl) {
+ if (sgl->length > CHCR_SG_SIZE)
+ ret = 1;
+ nents += DIV_ROUND_UP(sgl->length, CHCR_SG_SIZE);
+ sgl = sg_next(sgl);
+ }
+ *newents = nents;
+ return ret;
+}
+
+static inline void free_new_sg(struct scatterlist *sgl)
+{
+ kfree(sgl);
+}
+
+static struct scatterlist *alloc_new_sg(struct scatterlist *sgl,
+ unsigned int nents)
+{
+ struct scatterlist *newsg, *sg;
+ int i, len, processed = 0;
+ struct page *spage;
+ int offset;
+
+ newsg = kmalloc_array(nents, sizeof(struct scatterlist), GFP_KERNEL);
+ if (!newsg)
+ return ERR_PTR(-ENOMEM);
+ sg = newsg;
+ sg_init_table(sg, nents);
+ offset = sgl->offset;
+ spage = sg_page(sgl);
+ for (i = 0; i < nents; i++) {
+ len = min_t(u32, sgl->length - processed, CHCR_SG_SIZE);
+ sg_set_page(sg, spage, len, offset);
+ processed += len;
+ offset += len;
+ if (offset >= PAGE_SIZE) {
+ offset = offset % PAGE_SIZE;
+ spage++;
+ }
+ if (processed == sgl->length) {
+ processed = 0;
+ sgl = sg_next(sgl);
+ if (!sgl)
+ break;
+ spage = sg_page(sgl);
+ offset = sgl->offset;
+ }
+ sg = sg_next(sg);
+ }
+ return newsg;
+}
+