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>
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1 changed files with 10 additions and 12 deletions
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@ -87,7 +87,8 @@ enum {
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* the optimum value or until we reach MAX.
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*
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* Setting the following parameter to 0 is illegal: the pipelined mode
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* cannot be disabled (calculate_speeds() divides by tape->max_stages.)
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* cannot be disabled (idetape_calculate_speeds() divides by
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* tape->max_stages.)
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*/
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#define IDETAPE_MIN_PIPELINE_STAGES 1
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#define IDETAPE_MAX_PIPELINE_STAGES 400
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@ -1475,10 +1476,9 @@ static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
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pc->callback = &idetape_pc_callback;
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}
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static void calculate_speeds(ide_drive_t *drive)
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static void idetape_calculate_speeds(ide_drive_t *drive)
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{
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idetape_tape_t *tape = drive->driver_data;
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int full = 125, empty = 75;
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if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
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tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
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@ -1505,22 +1505,20 @@ static void calculate_speeds(ide_drive_t *drive)
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}
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}
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tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
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if (tape->speed_control == 0) {
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tape->max_insert_speed = 5000;
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} else if (tape->speed_control == 1) {
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if (tape->speed_control == 1) {
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if (tape->nr_pending_stages >= tape->max_stages / 2)
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tape->max_insert_speed = tape->pipeline_head_speed +
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(1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
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else
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tape->max_insert_speed = 500 +
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(tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
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if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
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tape->max_insert_speed = 5000;
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} else if (tape->speed_control == 2) {
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tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
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(tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
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} else
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tape->max_insert_speed = tape->speed_control;
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tape->max_insert_speed = max(tape->max_insert_speed, 500);
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}
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@ -1698,7 +1696,7 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
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tape->measure_insert_time = 1;
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if (time_after(jiffies, tape->insert_time))
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tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
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calculate_speeds(drive);
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idetape_calculate_speeds(drive);
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if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
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(stat & SEEK_STAT) == 0) {
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if (postponed_rq == NULL) {
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@ -2419,7 +2417,7 @@ static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
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idetape_switch_buffers(tape, new_stage);
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idetape_add_stage_tail(drive, new_stage);
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tape->pipeline_head++;
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calculate_speeds(drive);
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idetape_calculate_speeds(drive);
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/*
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* Estimate whether the tape has stopped writing by checking
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@ -2659,7 +2657,7 @@ static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
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idetape_remove_stage_head(drive);
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spin_unlock_irqrestore(&tape->spinlock, flags);
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tape->pipeline_head++;
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calculate_speeds(drive);
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idetape_calculate_speeds(drive);
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}
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if (bytes_read > blocks * tape->tape_block_size) {
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printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
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