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ide-cd: factor out transfer size checking from cdrom_read_intr()

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This is a preparation for cdrom_read_intr() and cdrom_write_intr() merge.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-02-01 23:09:26 +01:00
parent b4ab726c92
commit 64814f2399
1 changed files with 26 additions and 12 deletions
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38
drivers/ide/ide-cd.c
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@ -713,6 +713,31 @@ int cdrom_read_check_ireason (ide_drive_t *drive, int len, int ireason)
return -1;
}
/*
* Assume that the drive will always provide data in multiples of at least
* SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
*/
static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
{
struct cdrom_info *cd = drive->driver_data;
if ((len % SECTOR_SIZE) == 0)
return 0;
printk(KERN_ERR "%s: %s: Bad transfer size %d\n",
drive->name, __FUNCTION__, len);
if (cd->cd_flags & IDE_CD_FLAG_LIMIT_NFRAMES)
printk(KERN_ERR " This drive is not supported by "
"this version of the driver\n");
else {
printk(KERN_ERR " Trying to limit transfer sizes\n");
cd->cd_flags |= IDE_CD_FLAG_LIMIT_NFRAMES;
}
return 1;
}
/*
* Interrupt routine. Called when a read request has completed.
*/
@ -774,18 +799,7 @@ static ide_startstop_t cdrom_read_intr (ide_drive_t *drive)
if (cdrom_read_check_ireason (drive, len, ireason))
return ide_stopped;
/* Assume that the drive will always provide data in multiples
of at least SECTOR_SIZE, as it gets hairy to keep track
of the transfers otherwise. */
if ((len % SECTOR_SIZE) != 0) {
printk (KERN_ERR "%s: cdrom_read_intr: Bad transfer size %d\n",
drive->name, len);
if (info->cd_flags & IDE_CD_FLAG_LIMIT_NFRAMES)
printk (KERN_ERR " This drive is not supported by this version of the driver\n");
else {
printk (KERN_ERR " Trying to limit transfer sizes\n");
info->cd_flags |= IDE_CD_FLAG_LIMIT_NFRAMES;
}
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}