ide-atapi: kill unused fields and callbacks

Impact: remove fields and code paths which are no longer necessary

Now that ide-tape uses standard mechanisms to transfer data, special
case handling for bh handling can be dropped from ide-atapi.  Drop the
followings.

* pc->cur_pos, b_count, bh and b_data
* drive->pc_update_buffers() and pc_io_buffers().

Signed-off-by: Tejun Heo <tj@kernel.org>

3 files changed, 4 insertions, 26 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index b9dd4503cbc7..afe5a4323879 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -359,11 +359,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
                                         drive->name, rq_data_dir(pc->rq)
                                                      ? "write" : "read");
                         pc->flags |= PC_FLAG_DMA_ERROR;
-                } else {
+                } else
                         pc->xferred = pc->req_xfer;
-                        if (drive->pc_update_buffers)
-                                drive->pc_update_buffers(drive, pc);
-                }
                 debug_log("%s: DMA finished\n", drive->name);
         }
 
@@ -463,16 +460,11 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
                 return ide_do_reset(drive);
         }
 
-        if (drive->media == ide_tape && pc->bh)
-                done = drive->pc_io_buffers(drive, pc, bcount, write);
-        else {
-                done = min_t(unsigned int, bcount, cmd->nleft);
-                ide_pio_bytes(drive, cmd, write, done);
-        }
+        done = min_t(unsigned int, bcount, cmd->nleft);
+        ide_pio_bytes(drive, cmd, write, done);
 
-        /* Update the current position */
+        /* Update transferred byte count */
         pc->xferred += done;
-        pc->cur_pos += done;
 
         bcount -= done;
 
@@ -650,7 +642,6 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 
                 /* We haven't transferred any data yet */
                 pc->xferred = 0;
-                pc->cur_pos = pc->buf;
 
                 valid_tf = IDE_VALID_DEVICE;
                 bcount = ((drive->media == ide_tape) ?
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 2599579e4174..8dfc68892d6a 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -591,7 +591,6 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
         ide_init_pc(pc);
         put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
         pc->c[1] = 1;
-        pc->bh = NULL;
         pc->buf = NULL;
         pc->buf_size = length * tape->blk_size;
         pc->req_xfer = pc->buf_size;
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 1957461ac762..34c128f0a33c 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -362,11 +362,7 @@ struct ide_atapi_pc {
 
         /* data buffer */
         u8 *buf;
-        /* current buffer position */
-        u8 *cur_pos;
         int buf_size;
-        /* missing/available data on the current buffer */
-        int b_count;
 
         /* the corresponding request */
         struct request *rq;
@@ -379,10 +375,6 @@ struct ide_atapi_pc {
          */
         u8 pc_buf[IDE_PC_BUFFER_SIZE];
 
-        /* idetape only */
-        struct idetape_bh *bh;
-        char *b_data;
-
         unsigned long timeout;
 };
 
@@ -595,10 +587,6 @@ struct ide_drive_s {
         /* callback for packet commands */
         int  (*pc_callback)(struct ide_drive_s *, int);
 
-        void (*pc_update_buffers)(struct ide_drive_s *, struct ide_atapi_pc *);
-        int  (*pc_io_buffers)(struct ide_drive_s *, struct ide_atapi_pc *,
-                              unsigned int, int);
-
         ide_startstop_t (*irq_handler)(struct ide_drive_s *);
 
         unsigned long atapi_flags;