staging: ft1000: duplicate code replaced with call to request_code_segment

function scram_dnldr, in ft1000_download.c, is very long and consists
mainly of nested switch statements inside a while loop. Some code in one
of the inner switch cases was almost identical to the code in the
previously extracted function request_code_segment. The duplicated code
was replaced with a call to request_code_segment, and
request_code_segment was slightly modified to work in both cases.

A new parameter was added to request_code_segment, a bool to distinguish
which case it was replacing. The name of an existing parameter (now
called endpoint) was changed to reflect the fact that it will be passed
in from more than one place. Several lines from the case containing the
duplicated code were moved to request_code_segment, and a test was added
to determine if these lines or a line from the original function should
be run.

Finally, an unused variable (tempword) was removed from scram_dnldr.

Signed-off-by: Kelley Nielsen <kelleynnn@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ft1000/ft1000-usb/ft1000_download.c

@@ -576,7 +576,7 @@ static int scram_start_dwnld(struct ft1000_usb *ft1000dev, u16 *hshake,
 }
 
 static u16 request_code_segment(struct ft1000_usb *ft1000dev, u16 **s_file,
-		 u8 **c_file, const u8 *boot_end)
+		 u8 **c_file, const u8 *endpoint, bool boot_case)
 {
 	long word_length;
 	u16 status;
@@ -589,7 +589,7 @@ static u16 request_code_segment(struct ft1000_usb *ft1000dev, u16 **s_file,
 		DEBUG("FT1000:download:Download error: Max length exceeded\n");
 		return STATUS_FAILURE;
 	}
-	if ((word_length * 2 + (long)c_file) > (long)boot_end) {
+	if ((word_length * 2 + (long)c_file) > (long)endpoint) {
 		/* Error, beyond boot code range.*/
 		DEBUG("FT1000:download:Download error: Requested len=%d exceeds BOOT code boundary.\n", (int)word_length);
 		return STATUS_FAILURE;
@@ -597,9 +597,18 @@ static u16 request_code_segment(struct ft1000_usb *ft1000dev, u16 **s_file,
 	if (word_length & 0x1)
 		word_length++;
 	word_length = word_length / 2;
+
+	if (boot_case) {
 		status = write_blk(ft1000dev, s_file, c_file, word_length);
 		/*DEBUG("write_blk returned %d\n", status); */
-
+	} else {
+		write_blk_fifo(ft1000dev, s_file, c_file, word_length);
+		if (ft1000dev->usbboot == 0)
+			ft1000dev->usbboot++;
+		if (ft1000dev->usbboot == 1)
+			ft1000_write_dpram16(ft1000dev,
+					DWNLD_MAG1_PS_HDR_LOC, 0, 0);
+	}
 	return status;
 }
 
@@ -615,7 +624,6 @@ u16 scram_dnldr(struct ft1000_usb *ft1000dev, void *pFileStart,
 	long word_length;
 	u16 request;
 	u16 temp;
-	u16 tempword;
 
 	struct dsp_file_hdr *file_hdr;
 	struct dsp_image_info *dsp_img_info = NULL;
@@ -703,7 +711,8 @@ u16 scram_dnldr(struct ft1000_usb *ft1000dev, void *pFileStart,
 				case REQUEST_CODE_SEGMENT:
 					status = request_code_segment(ft1000dev,
 							&s_file, &c_file,
-							(const u8 *)boot_end);
+							(const u8 *)boot_end,
+							true);
 				break;
 				default:
 					DEBUG
@@ -805,45 +814,10 @@ u16 scram_dnldr(struct ft1000_usb *ft1000dev, void *pFileStart,
 						break;
 					}
 
-					word_length =
+					status = request_code_segment(ft1000dev,
-					    get_request_value(ft1000dev);
+							&s_file, &c_file,
-					//DEBUG("FT1000:download:word_length = %d\n", (int)word_length);
+							(const u8 *)code_end,
-					if (word_length > MAX_LENGTH) {
+							false);
-						DEBUG
-						    ("FT1000:download:Download error: Max length exceeded\n");
-						status = STATUS_FAILURE;
-						break;
-					}
-					if ((word_length * 2 + c_file) >
-					    code_end) {
-						/*
-						 * Error, beyond boot code range.
-						 */
-						DEBUG
-						    ("FT1000:download:Download error: Requested len=%d exceeds DSP code boundary.\n",
-						     (int)word_length);
-						status = STATUS_FAILURE;
-						break;
-					}
-					/*
-					 * Position ASIC DPRAM auto-increment pointer.
-					 */
-					dpram = (u16) DWNLD_MAG1_PS_HDR_LOC;
-					if (word_length & 0x1)
-						word_length++;
-					word_length = word_length / 2;
-
-					write_blk_fifo(ft1000dev, &s_file,
-						       &c_file, word_length);
-					if (ft1000dev->usbboot == 0)
-						ft1000dev->usbboot++;
-					if (ft1000dev->usbboot == 1) {
-						tempword = 0;
-						ft1000_write_dpram16(ft1000dev,
-								     DWNLD_MAG1_PS_HDR_LOC,
-								     tempword,
-								     0);
-					}
 
 					break;