Commit b8bd6dc3 authored Dec 16, 2013 by Robin H. Johnson Committed by Tejun Heo Dec 16, 2013

libata: disable a disk via libata.force params



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>
Cc: stable@vger.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

parent 6fec8871

Documentation/kernel-parameters.txt

+2 −0

Original line number	Diff line number	Diff line
		@@ -1529,6 +1529,8 @@ 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.

drivers/ata/libata-core.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -6522,6 +6522,7 @@ 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;