ide: sanitize ide_build_sglist() and ide_destroy_dmatable()

* Move ide_map_sg() calls out from ide_build_sglist()
  to ide_dma_prepare().

* Pass command to ide_destroy_dmatable().

* Rename ide_build_sglist() to ide_dma_map_sg()
  and ide_destroy_dmatable() to ide_dma_unmap_sg().

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 25 insertions, 25 deletions

diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 4d3102887d9c..a5612eadc306 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -89,17 +89,16 @@ static const struct drive_list_entry drive_blacklist[] = {
 ide_startstop_t ide_dma_intr(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
+        struct ide_cmd *cmd = &hwif->cmd;
         u8 stat = 0, dma_stat = 0;
 
         drive->waiting_for_dma = 0;
         dma_stat = hwif->dma_ops->dma_end(drive);
-        ide_destroy_dmatable(drive);
+        ide_dma_unmap_sg(drive, cmd);
         stat = hwif->tp_ops->read_status(hwif);
 
         if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) {
                 if (!dma_stat) {
-                        struct ide_cmd *cmd = &hwif->cmd;
-
                         if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
                                 ide_finish_cmd(drive, cmd, stat);
                         else
@@ -119,8 +118,8 @@ int ide_dma_good_drive(ide_drive_t *drive)
 }
 
 /**
- *      ide_build_sglist        -       map IDE scatter gather for DMA I/O
- *      @drive: the drive to build the DMA table for
+ *      ide_dma_map_sg  -       map IDE scatter gather for DMA I/O
+ *      @drive: the drive to map the DMA table for
  *      @cmd: command
  *
  *      Perform the DMA mapping magic necessary to access the source or
@@ -129,23 +128,19 @@ int ide_dma_good_drive(ide_drive_t *drive)
  *      operate in a portable fashion.
  */
 
-static int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
+static int ide_dma_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
 {
         ide_hwif_t *hwif = drive->hwif;
         struct scatterlist *sg = hwif->sg_table;
         int i;
 
-        ide_map_sg(drive, cmd);
-
         if (cmd->tf_flags & IDE_TFLAG_WRITE)
                 cmd->sg_dma_direction = DMA_TO_DEVICE;
         else
                 cmd->sg_dma_direction = DMA_FROM_DEVICE;
 
         i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction);
-        if (i == 0)
-                ide_map_sg(drive, cmd);
-        else {
+        if (i) {
                 cmd->orig_sg_nents = cmd->sg_nents;
                 cmd->sg_nents = i;
         }
@@ -154,7 +149,7 @@ static int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
 }
 
 /**
- *      ide_destroy_dmatable    -       clean up DMA mapping
+ *      ide_dma_unmap_sg        -       clean up DMA mapping
  *      @drive: The drive to unmap
  *
  *      Teardown mappings after DMA has completed. This must be called
@@ -164,15 +159,14 @@ static int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
  *      time.
  */
 
-void ide_destroy_dmatable(ide_drive_t *drive)
+void ide_dma_unmap_sg(ide_drive_t *drive, struct ide_cmd *cmd)
 {
         ide_hwif_t *hwif = drive->hwif;
-        struct ide_cmd *cmd = &hwif->cmd;
 
         dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents,
                      cmd->sg_dma_direction);
 }
-EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
+EXPORT_SYMBOL_GPL(ide_dma_unmap_sg);
 
 /**
  *      ide_dma_off_quietly     -       Generic DMA kill
@@ -471,6 +465,7 @@ ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
 {
         ide_hwif_t *hwif = drive->hwif;
         const struct ide_dma_ops *dma_ops = hwif->dma_ops;
+        struct ide_cmd *cmd = &hwif->cmd;
         struct request *rq;
         ide_startstop_t ret = ide_stopped;
 
@@ -482,7 +477,7 @@ ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
                 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
                 drive->waiting_for_dma = 0;
                 (void)dma_ops->dma_end(drive);
-                ide_destroy_dmatable(drive);
+                ide_dma_unmap_sg(drive, cmd);
                 ret = ide_error(drive, "dma timeout error",
                                 hwif->tp_ops->read_status(hwif));
         } else {
@@ -495,7 +490,7 @@ ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
                                         hwif->tp_ops->read_status(hwif));
                         drive->waiting_for_dma = 0;
                         (void)dma_ops->dma_end(drive);
-                        ide_destroy_dmatable(drive);
+                        ide_dma_unmap_sg(drive, cmd);
                 }
         }
 
@@ -572,14 +567,19 @@ int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
         const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
 
         if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
-            (dma_ops->dma_check && dma_ops->dma_check(drive, cmd)) ||
-            ide_build_sglist(drive, cmd) == 0)
-                return 1;
-        if (dma_ops->dma_setup(drive, cmd)) {
-                ide_destroy_dmatable(drive);
-                ide_map_sg(drive, cmd);
-                return 1;
-        }
+            (dma_ops->dma_check && dma_ops->dma_check(drive, cmd)))
+                goto out;
+        ide_map_sg(drive, cmd);
+        if (ide_dma_map_sg(drive, cmd) == 0)
+                goto out_map;
+        if (dma_ops->dma_setup(drive, cmd))
+                goto out_dma_unmap;
         drive->waiting_for_dma = 1;
         return 0;
+out_dma_unmap:
+        ide_dma_unmap_sg(drive, cmd);
+out_map:
+        ide_map_sg(drive, cmd);
+out:
+        return 1;
 }