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Subject[PATCH 13/24] ide-tape: remove pipeline-specific code from idetape_chrdev_release
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Also, remove orphaned functions idetape_{discard_read,plug,wait_for}_pipeline.
Furthermore, tape->cache_stage becomes also unused, so remove it too. Finally,
simplify 4-level-nested if-condition into a single compound one in
idetape_chrdev_release().
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
---
drivers/ide/ide-tape.c | 78 +++++-------------------------------------------
1 files changed, 8 insertions(+), 70 deletions(-)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 3e80515..3cb6e3d 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -366,7 +366,6 @@ typedef struct ide_tape_obj {
/* New requests will be added to the pipeline here */
idetape_stage_t *last_stage;
/* Optional free stage which we can use */
- idetape_stage_t *cache_stage;
int pages_per_stage;
/* Wasted space in each stage */
int excess_bh_size;
@@ -2045,25 +2044,6 @@ static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
return (idetape_queue_pc_tail(drive, &pc));
}

-static void idetape_discard_read_pipeline(ide_drive_t *drive,
- int restore_position)
-{
- idetape_tape_t *tape = drive->driver_data;
- int cnt;
- int seek, position;
-
- cnt = __idetape_discard_read_pipeline(drive);
- if (restore_position) {
- position = idetape_read_position(drive);
- seek = position > cnt ? position - cnt : 0;
- if (idetape_position_tape(drive, seek, 0, 0)) {
- printk(KERN_INFO "ide-tape: %s: position_tape failed in"
- " discard_pipeline()\n", tape->name);
- return;
- }
- }
-}
-
/*
* Generate a read/write request for the block device interface and wait for it
* to be serviced.
@@ -2093,19 +2073,6 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
return (tape->blk_size * (blocks-rq.current_nr_sectors));
}

-/* start servicing the pipeline stages, starting from tape->next_stage. */
-static void idetape_plug_pipeline(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (tape->next_stage == NULL)
- return;
- if (!test_and_set_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
- idetape_activate_next_stage(drive);
- (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end);
- }
-}
-
static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
{
idetape_init_pc(pc);
@@ -2154,25 +2121,6 @@ static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
tape->merge_stage->bh);
}

-/*
- * Wait until all pending pipeline requests are serviced. Typically called on
- * device close.
- */
-static void idetape_wait_for_pipeline(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
- while (tape->next_stage || test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE,
- &tape->flags)) {
- idetape_plug_pipeline(drive);
- spin_lock_irqsave(&tape->lock, flags);
- if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags))
- idetape_wait_for_request(drive, tape->active_data_rq);
- spin_unlock_irqrestore(&tape->lock, flags);
- }
-}
-
static void idetape_restart_speed_control(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
@@ -2875,26 +2823,16 @@ static int idetape_chrdev_release(struct inode *inode, struct file *filp)

if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
idetape_write_release(drive, minor);
- if (tape->chrdev_dir == IDETAPE_DIR_READ) {
- if (minor < 128)
- idetape_discard_read_pipeline(drive, 1);
- else
- idetape_wait_for_pipeline(drive);
- }
- if (tape->cache_stage != NULL) {
- __idetape_kfree_stage(tape->cache_stage);
- tape->cache_stage = NULL;
- }
+
if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
(void) idetape_rewind_tape(drive);
- if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
- if (tape->door_locked == DOOR_LOCKED) {
- if (idetape_create_prevent_cmd(drive, &pc, 0)) {
- if (!idetape_queue_pc_tail(drive, &pc))
- tape->door_locked = DOOR_UNLOCKED;
- }
- }
- }
+
+ if (tape->chrdev_dir == IDETAPE_DIR_NONE &&
+ tape->door_locked == DOOR_LOCKED &&
+ idetape_create_prevent_cmd(drive, &pc, 0) &&
+ !idetape_queue_pc_tail(drive, &pc))
+ tape->door_locked = DOOR_UNLOCKED;
+
clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
ide_tape_put(tape);
unlock_kernel();
--
1.5.4.1


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