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ide-cd: add ide_cd_drain_data() helper

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Add ide_cd_drain_data() and use it in cdrom_{buffer_sectors,read_intr}()
(as a nice side-effect this cuts 0.5kB of code from ide-cd.o).

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 23:09:26 +01:00
parent c9f56a801a
commit b4ab726c92
1 changed files with 15 additions and 13 deletions
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28
drivers/ide/ide-cd.c
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@ -626,6 +626,16 @@ static void ide_cd_pad_transfer(ide_drive_t *drive, xfer_func_t *xf, int len)
} }
} }
static void ide_cd_drain_data(ide_drive_t *drive, int nsects)
{
while (nsects > 0) {
static char dum[SECTOR_SIZE];
drive->hwif->atapi_input_bytes(drive, dum, sizeof(dum));
nsects--;
}
}
/* /*
* Buffer up to SECTORS_TO_TRANSFER sectors from the drive in our sector * Buffer up to SECTORS_TO_TRANSFER sectors from the drive in our sector
* buffer. Once the first sector is added, any subsequent sectors are * buffer. Once the first sector is added, any subsequent sectors are
@ -664,11 +674,7 @@ static void cdrom_buffer_sectors (ide_drive_t *drive, unsigned long sector,
} }
/* Throw away any remaining data. */ /* Throw away any remaining data. */
while (sectors_to_transfer > 0) { ide_cd_drain_data(drive, sectors_to_transfer);
static char dum[SECTOR_SIZE];
HWIF(drive)->atapi_input_bytes(drive, dum, sizeof (dum));
--sectors_to_transfer;
}
} }
/* /*
@ -791,14 +797,10 @@ static ide_startstop_t cdrom_read_intr (ide_drive_t *drive)
any of the leading sectors. */ any of the leading sectors. */
nskip = min_t(int, rq->current_nr_sectors - bio_cur_sectors(rq->bio), sectors_to_transfer); nskip = min_t(int, rq->current_nr_sectors - bio_cur_sectors(rq->bio), sectors_to_transfer);
while (nskip > 0) { if (nskip > 0) {
/* We need to throw away a sector. */ ide_cd_drain_data(drive, nskip);
static char dum[SECTOR_SIZE]; rq->current_nr_sectors -= nskip;
HWIF(drive)->atapi_input_bytes(drive, dum, sizeof (dum)); sectors_to_transfer -= nskip;
--rq->current_nr_sectors;
--nskip;
--sectors_to_transfer;
} }
/* Now loop while we still have data to read from the drive. */ /* Now loop while we still have data to read from the drive. */