ide: refactor tf_read() method

Simplify tf_read() method, making it deal only with 'struct ide_taskfile' and
the validity flags that the upper layer passes, and factoring out the code that
deals with the high order bytes into ide_tf_readback() to be called from the
only two functions interested, ide_complete_cmd() and ide_dump_sector().

This should stop the needless code duplication in this method and so make
it about twice smaller than it was; along with simplifying the setup for
the method call, this should save both time and space...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 8 insertions, 13 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index a359323d8ffe..7201b176d75b 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -254,15 +254,13 @@ EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
 
 void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 {
-        struct ide_cmd cmd;
+        struct ide_taskfile tf;
 
-        memset(&cmd, 0, sizeof(cmd));
-        cmd.valid.in.tf = IDE_VALID_LBAH | IDE_VALID_LBAM | IDE_VALID_NSECT;
+        drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
+                                     IDE_VALID_LBAM | IDE_VALID_LBAH);
 
-        drive->hwif->tp_ops->tf_read(drive, &cmd);
-
-        *bcount = (cmd.tf.lbah << 8) | cmd.tf.lbam;
-        *ireason = cmd.tf.nsect & 3;
+        *bcount = (tf.lbah << 8) | tf.lbam;
+        *ireason = tf.nsect & 3;
 }
 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 
@@ -452,14 +450,11 @@ static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
 
 static u8 ide_read_ireason(ide_drive_t *drive)
 {
-        struct ide_cmd cmd;
-
-        memset(&cmd, 0, sizeof(cmd));
-        cmd.valid.in.tf = IDE_VALID_NSECT;
+        struct ide_taskfile tf;
 
-        drive->hwif->tp_ops->tf_read(drive, &cmd);
+        drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
 
-        return cmd.tf.nsect & 3;
+        return tf.nsect & 3;
 }
 
 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)