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7fe7e7858b
[ Upstream commitce83767ea3] The link_power_management_supported sysfs attribute is currently set as true even for ata ports that lack a .set_lpm() callback, e.g. dummy ports. This is a bit silly, because while writing to the link_power_management_policy sysfs attribute will make ata_scsi_lpm_store() update ap->target_lpm_policy (thus sysfs will reflect the new value) and call ata_port_schedule_eh() for the port, it is essentially a no-op. This is because for a port without a .set_lpm() callback, once EH gets to run, the ata_eh_link_set_lpm() will simply return, since the port does not provide a .set_lpm() callback. Thus, make sure that the link_power_management_supported sysfs attribute is set to false for ports that lack a .set_lpm() callback. This way the link_power_management_policy sysfs attribute will no longer be writable, so we will no longer be misleading users to think that their sysfs write actually does something. Fixes:0060beec0b("ata: libata-sata: Add link_power_management_supported sysfs attribute") Signed-off-by: Niklas Cassel <cassel@kernel.org> Tested-by: Wolf <wolf@yoxt.cc> Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
1738 lines
44 KiB
1738 lines
44 KiB