[ 41/42] libata: add a host flag to ignore detected ATA devices
From: Greg KH <gregkh@linuxfoundation.org>
Date: 2012-06-15 00:01:47
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3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Whitcroft <apw@canonical.com> commit db63a4c8115a0bb904496e1cdd3e7488e68b0d06 upstream. 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 <redacted> Cc: Victor Miasnikov <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/ata/libata-core.c | 6 ++++++ include/linux/libata.h | 1 + 2 files changed, 7 insertions(+)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c@@ -1973,6 +1973,12 @@ 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; --- 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 */