libata: disable a disk via libata.force params

commit b8bd6dc36186fe99afa7b73e9e2d9a98ad5c4865 upstream.

A user on StackExchange had a failing SSD that's soldered directly
onto the motherboard of his system. The BIOS does not give any option
to disable it at all, so he can't just hide it from the OS via the
BIOS.

The old IDE layer had hdX=noprobe override for situations like this,
but that was never ported to the libata layer.

This patch implements a disable flag for libata.force.

Example use:

 libata.force=2.0:disable

[v2 of the patch, removed the nodisable flag per Tejun Heo]

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://unix.stackexchange.com/questions/102648/how-to-tell-linux-kernel-3-0-to-completely-ignore-a-failing-disk
Link: http://askubuntu.com/questions/352836/how-can-i-tell-linux-kernel-to-completely-ignore-a-disk-as-if-it-was-not-even-co
Link: http://superuser.com/questions/599333/how-to-disable-kernel-probing-for-drive
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 3 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 96401631523d..1311a48a7367 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1458,6 +1458,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
                         * atapi_dmadir: Enable ATAPI DMADIR bridge support
 
+                        * disable: Disable this device.
+
                         If there are multiple matching configurations changing
                         the same attribute, the last one is used.
 
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d18ab9015e3e..8cacd1693f03 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6507,6 +6507,7 @@ static int __init ata_parse_force_one(char **cur,
                 { "norst",      .lflags         = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
                 { "rstonce",    .lflags         = ATA_LFLAG_RST_ONCE },
                 { "atapi_dmadir", .horkage_on   = ATA_HORKAGE_ATAPI_DMADIR },
+                { "disable",    .horkage_on     = ATA_HORKAGE_DISABLE },
         };
         char *start = *cur, *p = *cur;
         char *id, *val, *endp;