5.15-stable review patch. If anyone has any objections, please let me know.
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From: Damien Le Moal dlemoal@kernel.org
[ Upstream commit 413e800cadbf67550d76c77c230b2ecd96bce83a ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- 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 04bdd53abf20..7cacb2bfc360 100644 --- a/drivers/ata/libata-sata.c +++ b/drivers/ata/libata-sata.c @@ -815,6 +815,11 @@ 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->horkage & ATA_HORKAGE_NOLPM) {