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| author | Vincent Pelletier <plr.vincent@gmail.com> | 2013-05-21 22:30:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-09 12:24:23 -0800 |
| commit | 3d097b15182906eaf121c48697ceda0ab9ddf55e (patch) | |
| tree | 8ed02a0a359761578bac38e94c59a3265188f5aa /Documentation | |
| parent | 6dcccce8791fa72bff307f6c2506d323705102cd (diff) | |
| download | lwn-3d097b15182906eaf121c48697ceda0ab9ddf55e.tar.gz lwn-3d097b15182906eaf121c48697ceda0ab9ddf55e.zip | |
libata: Add atapi_dmadir force flag
commit 966fbe193f47c68e70a80ec9991098e88e7959cb upstream.
Some device require DMADIR to be enabled, but are not detected as such
by atapi_id_dmadir. One such example is "Asus Serillel 2"
SATA-host-to-PATA-device bridge: the bridge itself requires DMADIR,
even if the bridged device does not.
As atapi_dmadir module parameter can cause problems with some devices
(as per Tejun Heo's memory), enabling it globally may not be possible
depending on the hardware.
This patch adds atapi_dmadir in the form of a "force" horkage value,
allowing global, per-bus and per-device control.
Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 2fe6e767b3d6..96401631523d 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1456,6 +1456,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. * dump_id: dump IDENTIFY data. + * atapi_dmadir: Enable ATAPI DMADIR bridge support + If there are multiple matching configurations changing the same attribute, the last one is used. |