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<tj@xxxxxxxxxx> Reported-by: Kyle McMartin<kyle@xxxxxxxxxxx> Cc: stable@xxxxxxxxxx --- drivers/ata/libata-eh.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
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