ide-tape: remove unreachable code chunk

tape->speed_control is set to 1 in idetape_setup(), but, in calculate_speeds()
its value is tested for being 0, 1, or 2. Remove the if-branches where
tape->speed_control != 1 since they are never executed. Also, rename
calculate_speeds() by adding driver's prefix as is with the other function
names.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 10 insertions, 12 deletions

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 3c516ff1adf0..1dc4a9ec36fc 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -87,7 +87,8 @@ enum {
  *      the optimum value or until we reach MAX.
  *
  *      Setting the following parameter to 0 is illegal: the pipelined mode
- *      cannot be disabled (calculate_speeds() divides by tape->max_stages.)
+ *      cannot be disabled (idetape_calculate_speeds() divides by
+ *      tape->max_stages.)
  */
 #define IDETAPE_MIN_PIPELINE_STAGES       1
 #define IDETAPE_MAX_PIPELINE_STAGES     400
@@ -1475,10 +1476,9 @@ static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
         pc->callback = &idetape_pc_callback;
 }
 
-static void calculate_speeds(ide_drive_t *drive)
+static void idetape_calculate_speeds(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
-        int full = 125, empty = 75;
 
         if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
                 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
@@ -1505,22 +1505,20 @@ static void calculate_speeds(ide_drive_t *drive)
                 }
         }
         tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
-        if (tape->speed_control == 0) {
-                tape->max_insert_speed = 5000;
-        } else if (tape->speed_control == 1) {
+
+        if (tape->speed_control == 1) {
                 if (tape->nr_pending_stages >= tape->max_stages / 2)
                         tape->max_insert_speed = tape->pipeline_head_speed +
                                 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
                 else
                         tape->max_insert_speed = 500 +
                                 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
+
                 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
                         tape->max_insert_speed = 5000;
-        } else if (tape->speed_control == 2) {
-                tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
-                        (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
         } else
                 tape->max_insert_speed = tape->speed_control;
+
         tape->max_insert_speed = max(tape->max_insert_speed, 500);
 }
 
@@ -1698,7 +1696,7 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
                 tape->measure_insert_time = 1;
         if (time_after(jiffies, tape->insert_time))
                 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
-        calculate_speeds(drive);
+        idetape_calculate_speeds(drive);
         if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
             (stat & SEEK_STAT) == 0) {
                 if (postponed_rq == NULL) {
@@ -2419,7 +2417,7 @@ static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
         idetape_switch_buffers(tape, new_stage);
         idetape_add_stage_tail(drive, new_stage);
         tape->pipeline_head++;
-        calculate_speeds(drive);
+        idetape_calculate_speeds(drive);
 
         /*
          *      Estimate whether the tape has stopped writing by checking
@@ -2659,7 +2657,7 @@ static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
                 idetape_remove_stage_head(drive);
                 spin_unlock_irqrestore(&tape->spinlock, flags);
                 tape->pipeline_head++;
-                calculate_speeds(drive);
+                idetape_calculate_speeds(drive);
         }
         if (bytes_read > blocks * tape->tape_block_size) {
                 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");