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[libata] allow ATAPI to be enabled with new atapi_enabled module option

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ATAPI is getting close to being ready.  To increase exposure, we enable
the code in the upstream kernel, but default it to off (present
behavior).  Users must pass atapi_enabled=1 as a module option (if
module) or on the kernel command line (if built in) to turn on
discovery of their ATAPI devices.
This commit is contained in:
Jeff Garzik 2005-08-30 03:37:42 -04:00
parent 1fdab81e67
commit 1623c81eec
4 changed files with 9 additions and 5 deletions
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4
drivers/scsi/libata-core.c
View File

@ -75,6 +75,10 @@ static void __ata_qc_complete(struct ata_queued_cmd *qc);
static unsigned int ata_unique_id = 1;
static struct workqueue_struct *ata_wq;
int atapi_enabled = 0;
module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");

8
drivers/scsi/libata-scsi.c
View File

@ -1470,10 +1470,10 @@ ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev)
if (unlikely(!ata_dev_present(dev)))
return NULL;
#ifndef ATA_ENABLE_ATAPI
if (unlikely(dev->class == ATA_DEV_ATAPI))
return NULL;
#endif
if (atapi_enabled) {
if (unlikely(dev->class == ATA_DEV_ATAPI))
return NULL;
}
return dev;
}

1
drivers/scsi/libata.h
View File

@ -38,6 +38,7 @@ struct ata_scsi_args {
};
/* libata-core.c */
extern int atapi_enabled;
extern struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
struct ata_device *dev);
extern void ata_qc_free(struct ata_queued_cmd *qc);

1
include/linux/libata.h
View File

@ -40,7 +40,6 @@
#undef ATA_VERBOSE_DEBUG /* yet more debugging output */
#undef ATA_IRQ_TRAP /* define to ack screaming irqs */
#undef ATA_NDEBUG /* define to disable quick runtime checks */
#undef ATA_ENABLE_ATAPI /* define to enable ATAPI support */
#undef ATA_ENABLE_PATA /* define to enable PATA support in some
* low-level drivers */
#undef ATAPI_ENABLE_DMADIR /* enables ATAPI DMADIR bridge support */