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ata: libata-sata: Disallow changing LPM state if not supported

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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@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20250701125321.69496-6-dlemoal@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
This commit is contained in:
Damien Le Moal 2025-07-01 21:53:16 +09:00 committed by Niklas Cassel
parent 4371fe1ba4
commit 413e800cad
1 changed files with 5 additions and 0 deletions
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5
drivers/ata/libata-sata.c
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@ -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) {