[PATCH 3/5] libata: add a host flag to ignore detected ATA devices
Andy Whitcroft
apw at canonical.com
Wed Dec 5 10:30:57 UTC 2012
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 at canonical.com>
Signed-off-by: Jeff Garzik <jgarzik at redhat.com>
BugLink: http://bugs.launchpad.net/bugs/1079084
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
drivers/ata/libata-core.c | 6 ++++++
include/linux/libata.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 321e23e..c46848d 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1972,6 +1972,12 @@ retry:
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;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index cafc09a..4df19e7 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -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 */
--
1.7.10.4
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