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Subject[PATCH 03/22] ide-tape: remove unreachable code chunk
Date
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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>
---
drivers/ide/ide-tape.c | 22 ++++++++++------------
1 files changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index c8c57ab..b15dd17 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);
}

@@ -1697,7 +1695,7 @@ 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");
--
1.5.3.7


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