ide-disk: use do_rw_taskfile() (take 2)

* Add IDE_TFLAG_DMA_PIO_FALLBACK taskfile flag to indicate the need
  to skip loading taskfile registers in do_rw_taskfile().

* Export do_rw_taskfile().

* Convert __ide_do_rw_disk() to use do_rw_taskfile().

* Unexport ide_tf_load().

* Unexport {pre_task_out,task_in}_intr() and make it static.

* Remove incorrect comment about do_rw_taskfile() from <linux/ide.h>.

There should be no functionality changes caused by this patch.

v2:
* Add missing blk_fs_request() check to task_dma_ok() (for VDMA).

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

1 files changed, 8 insertions, 8 deletions

diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 236f91f11a73..2d63ea9ee61b 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -114,8 +114,6 @@ void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
                 hwif->OUTB((tf->device & HIHI) | drive->select.all, IDE_SELECT_REG);
 }
 
-EXPORT_SYMBOL_GPL(ide_tf_load);
-
 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
 {
         ide_task_t args;
@@ -133,7 +131,7 @@ int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
 
 static int inline task_dma_ok(ide_task_t *task)
 {
-        if (task->tf_flags & IDE_TFLAG_FLAGGED)
+        if (blk_fs_request(task->rq) || (task->tf_flags & IDE_TFLAG_FLAGGED))
                 return 1;
 
         switch (task->tf.command) {
@@ -154,6 +152,8 @@ static ide_startstop_t task_no_data_intr(ide_drive_t *);
 static ide_startstop_t set_geometry_intr(ide_drive_t *);
 static ide_startstop_t recal_intr(ide_drive_t *);
 static ide_startstop_t set_multmode_intr(ide_drive_t *);
+static ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *);
+static ide_startstop_t task_in_intr(ide_drive_t *);
 
 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
 {
@@ -173,7 +173,8 @@ ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
         if (task->tf_flags & IDE_TFLAG_FLAGGED)
                 task->tf_flags |= IDE_TFLAG_FLAGGED_SET_IN_FLAGS;
 
-        ide_tf_load(drive, task);
+        if ((task->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0)
+                ide_tf_load(drive, task);
 
         switch (task->data_phase) {
         case TASKFILE_MULTI_OUT:
@@ -208,6 +209,7 @@ ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
                 return ide_started;
         }
 }
+EXPORT_SYMBOL_GPL(do_rw_taskfile);
 
 /*
  * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
@@ -446,7 +448,7 @@ static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
 /*
  * Handler for command with PIO data-in phase (Read/Read Multiple).
  */
-ide_startstop_t task_in_intr (ide_drive_t *drive)
+static ide_startstop_t task_in_intr(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
         struct request *rq = HWGROUP(drive)->rq;
@@ -477,7 +479,6 @@ ide_startstop_t task_in_intr (ide_drive_t *drive)
 
         return ide_started;
 }
-EXPORT_SYMBOL(task_in_intr);
 
 /*
  * Handler for command with PIO data-out phase (Write/Write Multiple).
@@ -507,7 +508,7 @@ static ide_startstop_t task_out_intr (ide_drive_t *drive)
         return ide_started;
 }
 
-ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
+static ide_startstop_t pre_task_out_intr(ide_drive_t *drive, struct request *rq)
 {
         ide_startstop_t startstop;
 
@@ -528,7 +529,6 @@ ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
 
         return ide_started;
 }
-EXPORT_SYMBOL(pre_task_out_intr);
 
 int ide_raw_taskfile(ide_drive_t *drive, ide_task_t *task, u8 *buf, u16 nsect)
 {