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Date: Fri, 20 Feb 2009 18:12:09 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: linux-ide@...r.kernel.org
Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 04/10] ide: add ide_dma_prepare() helper
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] ide: add ide_dma_prepare() helper
* Add ide_dma_prepare() helper.
* Convert ide_issue_pc() and do_rw_taskfile() to use it.
* Make ide_build_sglist() static.
There should be no functional changes caused by this patch.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
drivers/ide/ide-atapi.c | 18 ++++--------------
drivers/ide/ide-dma.c | 11 ++++++++++-
drivers/ide/ide-taskfile.c | 4 +---
include/linux/ide.h | 7 ++++---
4 files changed, 19 insertions(+), 21 deletions(-)
Index: b/drivers/ide/ide-atapi.c
===================================================================
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -605,7 +605,6 @@ ide_startstop_t ide_issue_pc(ide_drive_t
{
struct ide_atapi_pc *pc;
ide_hwif_t *hwif = drive->hwif;
- const struct ide_dma_ops *dma_ops = hwif->dma_ops;
ide_expiry_t *expiry = NULL;
struct request *rq = hwif->rq;
unsigned int timeout;
@@ -619,12 +618,8 @@ ide_startstop_t ide_issue_pc(ide_drive_t
expiry = ide_cd_expiry;
timeout = ATAPI_WAIT_PC;
- if (drive->dma) {
- if (ide_build_sglist(drive, cmd))
- drive->dma = !dma_ops->dma_setup(drive, cmd);
- else
- drive->dma = 0;
- }
+ if (drive->dma)
+ drive->dma = !ide_dma_prepare(drive, cmd);
} else {
pc = drive->pc;
@@ -642,13 +637,8 @@ ide_startstop_t ide_issue_pc(ide_drive_t
ide_dma_off(drive);
}
- if ((pc->flags & PC_FLAG_DMA_OK) &&
- (drive->dev_flags & IDE_DFLAG_USING_DMA)) {
- if (ide_build_sglist(drive, cmd))
- drive->dma = !dma_ops->dma_setup(drive, cmd);
- else
- drive->dma = 0;
- }
+ if (pc->flags & PC_FLAG_DMA_OK)
+ drive->dma = !ide_dma_prepare(drive, cmd);
if (!drive->dma)
pc->flags &= ~PC_FLAG_DMA_OK;
Index: b/drivers/ide/ide-dma.c
===================================================================
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -128,7 +128,7 @@ int ide_dma_good_drive(ide_drive_t *driv
* operate in a portable fashion.
*/
-int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
+static int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@@ -559,3 +559,12 @@ int ide_allocate_dma_engine(ide_hwif_t *
return 0;
}
EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
+
+int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
+{
+ if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
+ ide_build_sglist(drive, cmd) == 0 ||
+ drive->hwif->dma_ops->dma_setup(drive, cmd))
+ return 1;
+ return 0;
+}
Index: b/drivers/ide/ide-taskfile.c
===================================================================
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -100,9 +100,7 @@ ide_startstop_t do_rw_taskfile(ide_drive
ide_execute_command(drive, cmd, handler, WAIT_WORSTCASE);
return ide_started;
case ATA_PROT_DMA:
- if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
- ide_build_sglist(drive, cmd) == 0 ||
- dma_ops->dma_setup(drive, cmd))
+ if (ide_dma_prepare(drive, cmd))
return ide_stopped;
hwif->expiry = dma_ops->dma_timer_expiry;
ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD);
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1440,7 +1440,8 @@ ide_startstop_t ide_dma_intr(ide_drive_t
int ide_allocate_dma_engine(ide_hwif_t *);
void ide_release_dma_engine(ide_hwif_t *);
-int ide_build_sglist(ide_drive_t *, struct ide_cmd *);
+int ide_dma_prepare(ide_drive_t *, struct ide_cmd *);
+
void ide_destroy_dmatable(ide_drive_t *);
#ifdef CONFIG_BLK_DEV_IDEDMA_SFF
@@ -1474,8 +1475,8 @@ static inline void ide_check_dma_crc(ide
static inline ide_startstop_t ide_dma_intr(ide_drive_t *drive) { return ide_stopped; }
static inline ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) { return ide_stopped; }
static inline void ide_release_dma_engine(ide_hwif_t *hwif) { ; }
-static inline int ide_build_sglist(ide_drive_t *drive,
- struct ide_cmd *cmd) { return 0; }
+static int ide_dma_prepare(ide_drive_t *drive,
+ struct ide_cmd *cmd) { return 1; }
#endif /* CONFIG_BLK_DEV_IDEDMA */
#ifdef CONFIG_BLK_DEV_IDEACPI
--
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