ide: remove 'tf_in_flags' field from ide_task_t

* Add IDE_TFLAG_IN_DATA taskfile flag to indicate the need of reading
  IDE_DATA_REG in ide_end_drive_cmd().

  Set the new flag in ide_taskfile_ioctl() if ->in_flags.b.data is set.

* Add IDE_TFLAG_FLAGGED_SET_IN_FLAGS taskfile flag to indicate the
  need of modifying ->in_flags in ide_taskfile_ioctl().

  Set the new flag in flagged_taskfile() and move the code modifying
  ->tf_in_flags to ide_taskfile_ioctl().

  While at it remove the bogus comment: ->tf_in_flags (except .b.data)
  have no effect on selection of registers to read.

* Remove no longer needed 'tf_in_flags' field from ide_task_t.

As the result we finally have the internals of HDIO_DRIVE_TASKFILE ioctl
separated from the core IDE code.

There should be no functionality changes caused by this patch.

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

3 files changed, 17 insertions, 19 deletions

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index f4f7e3db10ac..1112d8b049b9 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -340,7 +340,7 @@ void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
                 if (args) {
                         struct ide_taskfile *tf = &args->tf;
 
-                        if (args->tf_in_flags.b.data) {
+                        if (args->tf_flags & IDE_TFLAG_IN_DATA) {
                                 u16 data = hwif->INW(IDE_DATA_REG);
 
                                 tf->data = data & 0xff;
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index ff28449bbcaf..03c4a0c55bf4 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -599,8 +599,8 @@ int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 
         memcpy(&args.tf_array[0], req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE - 2);
         memcpy(&args.tf_array[6], req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
-        args.tf_in_flags  = req_task->in_flags;
-        args.data_phase   = req_task->data_phase;
+
+        args.data_phase = req_task->data_phase;
 
         args.tf_flags = IDE_TFLAG_OUT_DEVICE;
         if (drive->addressing == 1)
@@ -637,6 +637,9 @@ int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
                         args.tf_flags |= IDE_TFLAG_OUT_HOB;
         }
 
+        if (req_task->in_flags.b.data)
+                args.tf_flags |= IDE_TFLAG_IN_DATA;
+
         drive->io_32bit = 0;
         switch(req_task->data_phase) {
                 case TASKFILE_MULTI_OUT:
@@ -704,7 +707,13 @@ int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
 
         memcpy(req_task->hob_ports, &args.tf_array[0], HDIO_DRIVE_HOB_HDR_SIZE - 2);
         memcpy(req_task->io_ports, &args.tf_array[6], HDIO_DRIVE_TASK_HDR_SIZE);
-        req_task->in_flags  = args.tf_in_flags;
+
+        if ((args.tf_flags & IDE_TFLAG_FLAGGED_SET_IN_FLAGS) &&
+            req_task->in_flags.all == 0) {
+                req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
+                if (drive->addressing == 1)
+                        req_task->in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
+        }
 
         if (copy_to_user(buf, req_task, tasksize)) {
                 err = -EFAULT;
@@ -846,19 +855,7 @@ ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
                 }
         }
 
-        /*
-         * (ks) Check taskfile in flags.
-         * If set, then execute as it is defined.
-         * If not set, then define default settings.
-         * The default values are:
-         *      read all taskfile registers (except data)
-         *      read the hob registers (sector, nsector, lcyl, hcyl)
-         */
-        if (task->tf_in_flags.all == 0) {
-                task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
-                if (drive->addressing == 1)
-                        task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
-        }
+        task->tf_flags |= IDE_TFLAG_FLAGGED_SET_IN_FLAGS;
 
         return do_rw_taskfile(drive, task);
 }
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 7485fc705ca4..c23ef2df2cbb 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -910,6 +910,8 @@ enum {
                                           IDE_TFLAG_OUT_LBAH,
         IDE_TFLAG_OUT_DEVICE            = (1 << 14),
         IDE_TFLAG_WRITE                 = (1 << 15),
+        IDE_TFLAG_FLAGGED_SET_IN_FLAGS  = (1 << 16),
+        IDE_TFLAG_IN_DATA               = (1 << 17),
 };
 
 struct ide_taskfile {
@@ -946,8 +948,7 @@ typedef struct ide_task_s {
                 struct ide_taskfile     tf;
                 u8                      tf_array[14];
         };
-        u16                     tf_flags;
-        ide_reg_valid_t         tf_in_flags;
+        u32                     tf_flags;
         int                     data_phase;
         ide_pre_handler_t       *prehandler;
         ide_handler_t           *handler;