diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index 002b62902553..7e7c83a3d8cd 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -305,12 +305,12 @@ static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
 	size_t count;
 
 	while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
-		count = min(ctx->sg->length - ctx->offset, ctx->total);
-		count = min(count, ctx->buflen - ctx->bufcnt);
+		count = min3(ctx->sg->length - ctx->offset, ctx->total,
+			     ctx->buflen - ctx->bufcnt);
 
-		if (count <= 0) {
+		if (count == 0) {
 			/*
-			* Check if count <= 0 because the buffer is full or
+			* Check if count == 0 because the buffer is full or
 			* because the sg length is 0. In the latest case,
 			* check if there is another sg in the list, a 0 length
 			* sg doesn't necessarily mean the end of the sg list.