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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
This commit is contained in:
Robin H. Johnson 2013-12-16 09:31:19 -08:00 committed by Tejun Heo
parent 6fec88712c
commit b8bd6dc361
2 changed files with 3 additions and 0 deletions
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2
Documentation/kernel-parameters.txt
View File

@ -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.

1
drivers/ata/libata-core.c
View File

@ -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;