ide-tape: remove pipeline-specific code in idetape_space_over_filemarks()

Since we don't do pipeline read-ahead anymore, we don't have to look for
filemarks we have crossed. Therefore, remove the code chunk that does that and
pass on the command to the tape. As a side effect, remove unused
idetape_wait_first_stage().

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

1 files changed, 0 insertions, 53 deletions

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index de70cb7789f2..745e2fa549b9 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2051,19 +2051,6 @@ static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
         pc->idetape_callback = &idetape_pc_callback;
 }
 
-static void idetape_wait_first_stage(ide_drive_t *drive)
-{
-        idetape_tape_t *tape = drive->driver_data;
-        unsigned long flags;
-
-        if (tape->first_stage == NULL)
-                return;
-        spin_lock_irqsave(&tape->lock, flags);
-        if (tape->active_stage == tape->first_stage)
-                idetape_wait_for_request(drive, tape->active_data_rq);
-        spin_unlock_irqrestore(&tape->lock, flags);
-}
-
 /* Queue up a character device originated write request. */
 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
 {
@@ -2363,19 +2350,11 @@ static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
         return 0;
 }
 
-/*
- * The function below is now a bit more complicated than just passing the
- * command to the tape since we may have crossed some filemarks during our
- * pipelined read-ahead mode. As a minor side effect, the pipeline enables us to
- * support MTFSFM when the filemark is in our internal pipeline even if the tape
- * doesn't support spacing over filemarks in the reverse direction.
- */
 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
                                         int mt_count)
 {
         idetape_tape_t *tape = drive->driver_data;
         struct ide_atapi_pc pc;
-        unsigned long flags;
         int retval, count = 0;
         int sprev = !!(tape->caps[4] & 0x20);
 
@@ -2388,41 +2367,9 @@ static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
         }
 
         if (tape->chrdev_dir == IDETAPE_DIR_READ) {
-                /* its a read-ahead buffer, scan it for crossed filemarks. */
                 tape->merge_stage_size = 0;
                 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
                         ++count;
-                while (tape->first_stage != NULL) {
-                        if (count == mt_count) {
-                                if (mt_op == MTFSFM)
-                                        set_bit(IDETAPE_FLAG_FILEMARK,
-                                                &tape->flags);
-                                return 0;
-                        }
-                        spin_lock_irqsave(&tape->lock, flags);
-                        if (tape->first_stage == tape->active_stage) {
-                                /*
-                                 * We have reached the active stage in the read
-                                 * pipeline. There is no point in allowing the
-                                 * drive to continue reading any farther, so we
-                                 * stop the pipeline.
-                                 *
-                                 * This section should be moved to a separate
-                                 * subroutine because similar operations are
-                                 * done in __idetape_discard_read_pipeline(),
-                                 * for example.
-                                 */
-                                tape->next_stage = NULL;
-                                spin_unlock_irqrestore(&tape->lock, flags);
-                                idetape_wait_first_stage(drive);
-                                tape->next_stage = tape->first_stage->next;
-                        } else
-                                spin_unlock_irqrestore(&tape->lock, flags);
-                        if (tape->first_stage->rq.errors ==
-                                        IDETAPE_ERROR_FILEMARK)
-                                ++count;
-                        idetape_remove_stage_head(drive);
-                }
                 idetape_discard_read_pipeline(drive, 0);
         }