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libata: add a host flag to ignore detected ATA devices

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Where devices are visible via more than one host we sometimes wish to
indicate that cirtain devices should be ignored on a specific host.  Add a
host flag indicating that this host wishes to ignore ATA specific devices.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Andy Whitcroft 2012-05-04 22:15:10 +01:00 committed by Jeff Garzik
parent d48b97b403
commit db63a4c811
2 changed files with 7 additions and 0 deletions
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6
drivers/ata/libata-core.c
View file

@ -1973,6 +1973,12 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
if (class == ATA_DEV_ATA) {
if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
goto err_out;
if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
ata_id_is_ata(id)) {
ata_dev_dbg(dev,
"host indicates ignore ATA devices, ignored\n");
return -ENOENT;
}
} else {
if (ata_id_is_ata(id))
goto err_out;

1
include/linux/libata.h
View file

@ -247,6 +247,7 @@ enum {
ATA_HOST_SIMPLEX = (1 << 0), /* Host is simplex, one DMA channel per host only */
ATA_HOST_STARTED = (1 << 1), /* Host started */
ATA_HOST_PARALLEL_SCAN = (1 << 2), /* Ports on this host can be scanned in parallel */
ATA_HOST_IGNORE_ATA = (1 << 3), /* Ignore ATA devices on this host. */
/* bits 24:31 of host->flags are reserved for LLD specific flags */