To facilitate field debugging of link power management related issues, add a debug message to ata_eh_link_set_lpm() to easily track LPM policy changes done from EH context, that is, during device scan and revalidation, error handling, and when a policy change is issued through a host sysfs link_power_management_policy attribute. Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx> --- drivers/ata/libata-eh.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 7f5d13f9ca73..7134a4ff6535 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2140,6 +2140,9 @@ static int ata_eh_link_set_lpm(struct ata_link *link, if (WARN_ON_ONCE(policy == ATA_LPM_UNKNOWN)) return 0; + ata_link_dbg(link, "Set LPM policy: %d -> %d\n", + old_policy, policy); + /* * DIPM is enabled only for ATA_LPM_MIN_POWER, * ATA_LPM_MIN_POWER_WITH_PARTIAL, and ATA_LPM_MED_POWER_WITH_DIPM, as -- 2.50.0