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ide-atapi: accomodate transfer length calculation for ide-cd 

... by factoring it out of ide_cd_do_request() into a helper, as suggested by
Bart.

There should be no functionality change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
[bart: BLK_DEV_IDECD needs to select IDE_ATAPI now]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Borislav Petkov 2009-01-02 16:12:52 +01:00 committed by Bartlomiej Zolnierkiewicz
parent 4f02ff06b4
commit 392de1d53d
4 changed files with 19 additions and 3 deletions
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1
drivers/ide/Kconfig
View File

@ -137,6 +137,7 @@ config BLK_DEV_DELKIN
config BLK_DEV_IDECD
tristate "Include IDE/ATAPI CDROM support"
select IDE_ATAPI
---help---
If you have a CD-ROM drive using the ATAPI protocol, say Y. ATAPI is
a newer protocol used by IDE CD-ROM and TAPE drives, similar to the

15
drivers/ide/ide-atapi.c
View File

@ -252,6 +252,18 @@ int ide_scsi_expiry(ide_drive_t *drive)
}
EXPORT_SYMBOL_GPL(ide_scsi_expiry);
int ide_cd_get_xferlen(struct request *rq)
{
if (blk_fs_request(rq))
return 32768;
else if (blk_sense_request(rq) || blk_pc_request(rq) ||
rq->cmd_type == REQ_TYPE_ATA_PC)
return rq->data_len;
else
return 0;
}
EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
/*
* This is the usual interrupt handler which will be called during a packet
* command. We will transfer some of the data (as requested by the drive)
@ -551,7 +563,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout,
struct ide_atapi_pc *pc = drive->pc;
ide_hwif_t *hwif = drive->hwif;
u32 tf_flags;
u16 bcount = 0;
u16 bcount;
u8 scsi = !!(drive->dev_flags & IDE_DFLAG_SCSI);
/* We haven't transferred any data yet */
@ -560,6 +572,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout,
if (dev_is_idecd(drive)) {
tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
bcount = ide_cd_get_xferlen(hwif->hwgroup->rq);
} else if (scsi) {
tf_flags = 0;
bcount = min(pc->req_xfer, 63 * 1024);

4
drivers/ide/ide-cd.c
View File

@ -1214,8 +1214,9 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
__func__, rq->cmd[0], rq->cmd_type,
(unsigned long long)block);
xferlen = ide_cd_get_xferlen(rq);
if (blk_fs_request(rq)) {
xferlen = 32768;
fn = cdrom_start_rw_cont;
if (cdrom_start_rw(drive, rq) == ide_stopped)
@ -1225,7 +1226,6 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
return ide_stopped;
} else if (blk_sense_request(rq) || blk_pc_request(rq) ||
rq->cmd_type == REQ_TYPE_ATA_PC) {
xferlen = rq->data_len;
fn = cdrom_do_newpc_cont;
if (!rq->timeout)

2
include/linux/ide.h
View File

@ -1254,6 +1254,8 @@ static inline unsigned long ide_scsi_get_timeout(struct ide_atapi_pc *pc)
int ide_scsi_expiry(ide_drive_t *);
int ide_cd_get_xferlen(struct request *);
ide_startstop_t ide_issue_pc(ide_drive_t *, unsigned int, ide_expiry_t *);
ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);