diff options
| author | Jens Axboe <jens.axboe@oracle.com> | 2007-07-25 08:13:56 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:21:00 +0200 |
| commit | 55c16a70041ba55e235c5944dccb9c1de0dd3ca6 (patch) | |
| tree | e48c1d9943fc52329cae1656ca59d24751dd9b98 /drivers/ide/ide-taskfile.c | |
| parent | ba2da2f8d61a9d2e24754c6311a4ab6a5e70060a (diff) | |
| download | lwn-55c16a70041ba55e235c5944dccb9c1de0dd3ca6.tar.gz lwn-55c16a70041ba55e235c5944dccb9c1de0dd3ca6.zip | |
IDE: sg chaining support
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/ide/ide-taskfile.c')
| -rw-r--r-- | drivers/ide/ide-taskfile.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c index aa06dafb74ac..2a3c8d498343 100644 --- a/drivers/ide/ide-taskfile.c +++ b/drivers/ide/ide-taskfile.c @@ -45,6 +45,7 @@ #include <linux/hdreg.h> #include <linux/ide.h> #include <linux/bitops.h> +#include <linux/scatterlist.h> #include <asm/byteorder.h> #include <asm/irq.h> @@ -263,6 +264,7 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write) { ide_hwif_t *hwif = drive->hwif; struct scatterlist *sg = hwif->sg_table; + struct scatterlist *cursg = hwif->cursg; struct page *page; #ifdef CONFIG_HIGHMEM unsigned long flags; @@ -270,8 +272,14 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write) unsigned int offset; u8 *buf; - page = sg[hwif->cursg].page; - offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE; + cursg = hwif->cursg; + if (!cursg) { + cursg = sg; + hwif->cursg = sg; + } + + page = cursg->page; + offset = cursg->offset + hwif->cursg_ofs * SECTOR_SIZE; /* get the current page and offset */ page = nth_page(page, (offset >> PAGE_SHIFT)); @@ -285,8 +293,8 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write) hwif->nleft--; hwif->cursg_ofs++; - if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) { - hwif->cursg++; + if ((hwif->cursg_ofs * SECTOR_SIZE) == cursg->length) { + hwif->cursg = sg_next(hwif->cursg); hwif->cursg_ofs = 0; } @@ -367,6 +375,8 @@ static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq, static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat) { + HWIF(drive)->cursg = NULL; + if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { ide_task_t *task = rq->special; |