1 files changed, 23 insertions, 9 deletions

diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 81afd1790a1d..d6852c33cfb7 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -23,14 +23,6 @@
 #include "internal.h"
 #include "scatterwalk.h"
 
-enum km_type crypto_km_types[] = {
-	KM_USER0,
-	KM_USER1,
-	KM_SOFTIRQ0,
-	KM_SOFTIRQ1,
-};
-EXPORT_SYMBOL_GPL(crypto_km_types);
-
 static inline void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out)
 {
 	void *src = out ? buf : sgdata;
@@ -70,7 +62,7 @@ static void scatterwalk_pagedone(struct scatter_walk *walk, int out,
 		walk->offset += PAGE_SIZE - 1;
 		walk->offset &= PAGE_MASK;
 		if (walk->offset >= walk->sg->offset + walk->sg->length)
-			scatterwalk_start(walk, sg_next(walk->sg));
+			scatterwalk_start(walk, scatterwalk_sg_next(walk->sg));
 	}
 }
 
@@ -107,3 +99,25 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
 	}
 }
 EXPORT_SYMBOL_GPL(scatterwalk_copychunks);
+
+void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
+			      unsigned int start, unsigned int nbytes, int out)
+{
+	struct scatter_walk walk;
+	unsigned int offset = 0;
+
+	for (;;) {
+		scatterwalk_start(&walk, sg);
+
+		if (start < offset + sg->length)
+			break;
+
+		offset += sg->length;
+		sg = sg_next(sg);
+	}
+
+	scatterwalk_advance(&walk, start - offset);
+	scatterwalk_copychunks(buf, &walk, nbytes, out);
+	scatterwalk_done(&walk, out, 0);
+}
+EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy);