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ide-cd: add ide_cd_pad_transfer() helper 

Add ide_cd_pad_transfer() helper and use it in cdrom_[new]pc_intr()
and cdrom_{read,write}_check_ireason().

There should be no functionality changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-02-01 23:09:17 +01:00
parent 68661c53a2
commit 5a5222d9fa
1 changed files with 25 additions and 26 deletions
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51
drivers/ide/ide-cd.c
View File

@ -1007,6 +1007,15 @@ static ide_startstop_t cdrom_transfer_packet_command (ide_drive_t *drive,
typedef void (xfer_func_t)(ide_drive_t *, void *, u32);
static void ide_cd_pad_transfer(ide_drive_t *drive, xfer_func_t *xf, int len)
{
while (len > 0) {
int dum = 0;
xf(drive, &dum, sizeof(dum));
len -= sizeof(dum);
}
}
/*
* Buffer up to SECTORS_TO_TRANSFER sectors from the drive in our sector
* buffer. Once the first sector is added, any subsequent sectors are
@ -1063,17 +1072,15 @@ int cdrom_read_check_ireason (ide_drive_t *drive, int len, int ireason)
if (ireason == 2)
return 0;
else if (ireason == 0) {
ide_hwif_t *hwif = drive->hwif;
/* Whoops... The drive is expecting to receive data from us! */
printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
drive->name, __FUNCTION__);
/* Throw some data at the drive so it doesn't hang
and quit this request. */
while (len > 0) {
int dum = 0;
HWIF(drive)->atapi_output_bytes(drive, &dum, sizeof (dum));
len -= sizeof (dum);
}
ide_cd_pad_transfer(drive, hwif->atapi_output_bytes, len);
} else if (ireason == 1) {
/* Some drives (ASUS) seem to tell us that status
* info is available. just get it and ignore.
@ -1500,15 +1507,8 @@ static ide_startstop_t cdrom_pc_intr (ide_drive_t *drive)
/* Transfer the data. */
xferfunc(drive, rq->data, thislen);
/* If we haven't moved enough data to satisfy the drive,
add some padding. */
while (len > thislen) {
int dum = 0;
xferfunc(drive, &dum, sizeof(dum));
len -= sizeof(dum);
}
/* Keep count of how much data we've moved. */
len -= thislen;
rq->data += thislen;
rq->data_len -= thislen;
@ -1525,6 +1525,13 @@ static ide_startstop_t cdrom_pc_intr (ide_drive_t *drive)
return ide_stopped;
}
/*
* If we haven't moved enough data to satisfy the drive,
* add some padding.
*/
if (len > 0)
ide_cd_pad_transfer(drive, xferfunc, len);
/* Now we wait for another interrupt. */
ide_set_handler(drive, &cdrom_pc_intr, ATAPI_WAIT_PC, cdrom_timer_expiry);
return ide_started;
@ -1617,15 +1624,13 @@ static int cdrom_write_check_ireason(ide_drive_t *drive, int len, int ireason)
if (ireason == 0)
return 0;
else if (ireason == 2) {
ide_hwif_t *hwif = drive->hwif;
/* Whoops... The drive wants to send data. */
printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
drive->name, __FUNCTION__);
while (len > 0) {
int dum = 0;
HWIF(drive)->atapi_input_bytes(drive, &dum, sizeof(dum));
len -= sizeof(dum);
}
ide_cd_pad_transfer(drive, hwif->atapi_input_bytes, len);
} else {
/* Drive wants a command packet, or invalid ireason... */
printk(KERN_ERR "%s: %s: bad interrupt reason 0x%02x\n",
@ -1783,14 +1788,8 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
/*
* pad, if necessary
*/
if (len > 0) {
while (len > 0) {
int pad = 0;
xferfunc(drive, &pad, sizeof(pad));
len -= sizeof(pad);
}
}
if (len > 0)
ide_cd_pad_transfer(drive, xferfunc, len);
BUG_ON(HWGROUP(drive)->handler != NULL);