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>

3 files changed, 20 insertions, 34 deletions

diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 97abc91db7d0..3d7127ba67a0 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -185,6 +185,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
         u8 lba48                = (drive->addressing == 1) ? 1 : 0;
         ide_task_t              task;
         struct ide_taskfile     *tf = &task.tf;
+        ide_startstop_t         rc;
 
         if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) {
                 if (block + rq->nr_sectors > 1ULL << 28)
@@ -252,32 +253,22 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
                 task.tf_flags |= IDE_TFLAG_WRITE;
 
         ide_tf_set_cmd(drive, &task, dma);
+        if (!dma)
+                hwif->data_phase = task.data_phase;
+        task.rq = rq;
 
-        ide_tf_load(drive, &task);
+        rc = do_rw_taskfile(drive, &task);
 
-        if (dma) {
-                if (!hwif->dma_setup(drive)) {
-                        hwif->dma_exec_cmd(drive, tf->command);
-                        hwif->dma_start(drive);
-                        return ide_started;
-                }
+        if (rc == ide_stopped && dma) {
                 /* fallback to PIO */
+                task.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK;
                 ide_tf_set_cmd(drive, &task, 0);
+                hwif->data_phase = task.data_phase;
                 ide_init_sg_cmd(drive, rq);
+                rc = do_rw_taskfile(drive, &task);
         }
 
-        hwif->data_phase = task.data_phase;
-
-        if (rq_data_dir(rq) == READ) {
-                ide_execute_command(drive, tf->command, &task_in_intr,
-                                    WAIT_WORSTCASE, NULL);
-                return ide_started;
-        } else {
-                hwif->OUTBSYNC(drive, tf->command, IDE_COMMAND_REG);
-                ndelay(400);    /* FIXME */
-
-                return pre_task_out_intr(drive, rq);
-        }
+        return rc;
 }
 
 /*
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)
 {
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 721c9d8f41a2..c333a7528d94 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -912,6 +912,7 @@ enum {
         IDE_TFLAG_FLAGGED_SET_IN_FLAGS  = (1 << 16),
         IDE_TFLAG_IN_DATA               = (1 << 17),
         IDE_TFLAG_CUSTOM_HANDLER        = (1 << 18),
+        IDE_TFLAG_DMA_PIO_FALLBACK      = (1 << 19),
 };
 
 struct ide_taskfile {
@@ -965,13 +966,7 @@ extern int drive_is_ready(ide_drive_t *);
 
 void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8);
 
-/*
- * taskfile io for disks for now...and builds request from ide_ioctl
- */
-extern ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
-
-extern ide_startstop_t task_in_intr(ide_drive_t *);
-extern ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *);
+ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
 
 int ide_raw_taskfile(ide_drive_t *, ide_task_t *, u8 *, u16);
 int ide_no_data_taskfile(ide_drive_t *, ide_task_t *);