usb, dfu: extract flush code into seperate function

move the flushing code into an extra function dfu_flush(),
so it can be used from other code.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>

drivers/dfu/dfu.c

@@ -126,6 +126,28 @@ static int dfu_write_buffer_drain(struct dfu_entity *dfu)
 	return ret;
 }
 
+int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
+{
+	int ret = 0;
+
+	if (dfu->flush_medium)
+		ret = dfu->flush_medium(dfu);
+
+	printf("\nDFU complete CRC32: 0x%08x\n", dfu->crc);
+
+	/* clear everything */
+	dfu_free_buf();
+	dfu->crc = 0;
+	dfu->offset = 0;
+	dfu->i_blk_seq_num = 0;
+	dfu->i_buf_start = dfu_buf;
+	dfu->i_buf_end = dfu_buf;
+	dfu->i_buf = dfu->i_buf_start;
+	dfu->inited = 0;
+
+	return ret;
+}
+
 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 {
 	int ret = 0;
@@ -197,24 +219,8 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 	}
 
 	/* end? */
-	if (size == 0) {
-		/* Now try and flush to the medium if needed. */
-		if (dfu->flush_medium)
-			ret = dfu->flush_medium(dfu);
-		printf("\nDFU complete CRC32: 0x%08x\n", dfu->crc);
-
-		/* clear everything */
-		dfu_free_buf();
-		dfu->crc = 0;
-		dfu->offset = 0;
-		dfu->i_blk_seq_num = 0;
-		dfu->i_buf_start = dfu_buf;
-		dfu->i_buf_end = dfu_buf;
-		dfu->i_buf = dfu->i_buf_start;
-
-		dfu->inited = 0;
-
-	}
+	if (size == 0)
+		ret = dfu_flush(dfu, buf, size, blk_seq_num);
 
 	return ret = 0 ? size : ret;
 }

include/dfu.h

@@ -138,6 +138,7 @@ unsigned long dfu_get_buf_size(void);
 
 int dfu_read(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
 int dfu_write(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
+int dfu_flush(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
 /* Device specific */
 #ifdef CONFIG_DFU_MMC
 extern int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *s);