Vincent Pelletier 3d097b1518
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 >
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Vincent Pelletier
3d097b1518