On 12/09/2010 10:13 AM, Tejun Heo wrote:
Low level drivers may behave differently depending on the current
link->lpm_policy. During ata_eh_set_lpm(), DIPM enable commands are
issued after the successful completion of ap->ops->set_lpm(), which
means that the controller is already in the target state. This causes
DIPM enable commands to be processed with mismatching controller power
state and link->lpm_policy value.
In ahci, link->lpm_policy is used to ignore certain PHY events if LPM
is enabled; however, as DIPM commands are issued with stale
link->lpm_policy, they sometimes end up triggering these conditions
and get aborted leading to LPM configuration failure.
Fix it by updating link->lpm_policy before issuing DIPM enable
commands.
Signed-off-by: Tejun Heo<[email protected]>
Reported-by: Kyle McMartin<[email protected]>
Cc: [email protected]
---
drivers/ata/libata-eh.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
applied
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