[RESEND PATCH v2 3/3] ata: runtime suspend port if no device attached
From: Lin Ming <hidden>
Date: 2012-02-15 10:19:08
Also in:
lkml
Subsystem:
libata subsystem (serial and parallel ata drivers), the rest · Maintainers:
Damien Le Moal, Niklas Cassel, Linus Torvalds
Add a new function ata_device_probed(...) to check if device was probed. Runtime suspend scsi_host--->ata port if no device was probed. Controller will be runtime suspended if all port were suspended already. Signed-off-by: Lin Ming <redacted> --- drivers/ata/libata-core.c | 21 ++++++++++++++++++++- 1 files changed, 20 insertions(+), 1 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index c04ad68..1ff921b 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c@@ -5906,6 +5906,21 @@ int ata_port_probe(struct ata_port *ap) return rc; } +/** + * ata_device_probed - Check if device is probed + * @ap: port to check + */ +static bool ata_device_probed(struct ata_port *ap) +{ + struct ata_link *link; + struct ata_device *dev; + + ata_for_each_link(link, ap, EDGE) + ata_for_each_dev(dev, link, ENABLED) + return true; + + return false; +} static void async_port_probe(void *data, async_cookie_t cookie) {
@@ -5926,7 +5941,11 @@ static void async_port_probe(void *data, async_cookie_t cookie) /* in order to keep device order, we need to synchronize at this point */ async_synchronize_cookie(cookie); - ata_scsi_scan_host(ap, 1); + if (ata_device_probed(ap)) + ata_scsi_scan_host(ap, 1); + else + /* Runtime suspend it if no device is attached */ + pm_runtime_idle(&ap->scsi_host->shost_gendev); } /**
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1.7.2.5