Modify ata_scsi_lpm_store() to return an error if a user attempts to set
a link power management policy for a port that does not support LPM,
that is, ports flagged with ATA_FLAG_NO_LPM.
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Reviewed-by: Niklas Cassel <cassel@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/ata/libata-sata.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index cb46ce276bb1..47169c469f43 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -924,6 +924,11 @@ static ssize_t ata_scsi_lpm_store(struct device *device,
spin_lock_irqsave(ap->lock, flags);
+ if (ap->flags & ATA_FLAG_NO_LPM) {
+ count = -EOPNOTSUPP;
+ goto out_unlock;
+ }
+
ata_for_each_link(link, ap, EDGE) {
ata_for_each_dev(dev, &ap->link, ENABLED) {
if (dev->quirks & ATA_QUIRK_NOLPM) {
--
2.50.0