[PATCH v7 4/4] ata: set ncq_prio_enabled iff device has support
From: Adam Manzanares <hidden>
Date: 2016-12-06 17:33:50
Also in:
linux-block, lkml
Subsystem:
libata subsystem (serial and parallel ata drivers), the rest · Maintainers:
Damien Le Moal, Niklas Cassel, Linus Torvalds
From: Adam Manzanares <redacted> We previously had a check to see if the device has support for prioritized ncq commands and a check to see if a device flag is set, through a sysfs variable, in order to send a prioritized command. This patch only allows the sysfs variable to be set if the device supports prioritized commands enabling one check in ata_build_rw_tf in order to determine whether or not to send a prioritized command. This patch depends on ata: ATA Command Priority Disabled By Default tj: Minor subject and formatting updates. Signed-off-by: Adam Manzanares <redacted> --- drivers/ata/libata-core.c | 3 +-- drivers/ata/libata-scsi.c | 21 +++++++++++++++------ 2 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f6a631a..324e76e 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c@@ -787,8 +787,7 @@ int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev, if (tf->flags & ATA_TFLAG_FUA) tf->device |= 1 << 7; - if ((dev->flags & ATA_DFLAG_NCQ_PRIO) && - (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) { + if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE) { if (class == IOPRIO_CLASS_RT) tf->hob_nsect |= ATA_PRIO_HIGH << ATA_SHIFT_PRIO;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 328a601..c24cbf1 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c@@ -317,17 +317,26 @@ static ssize_t ata_ncq_prio_enable_store(struct device *device, ap = ata_shost_to_port(sdev->host); - spin_lock_irqsave(ap->lock, flags); dev = ata_scsi_find_dev(ap, sdev); - if (unlikely(!dev)) { - rc = -ENODEV; - goto unlock; + if (unlikely(!dev)) + return -ENODEV; + + if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) { + if (ata_id_has_ncq_prio(dev->id)) + ata_dev_config_ncq_prio(dev); } - if (input) + spin_lock_irqsave(ap->lock, flags); + if (input) { + if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) { + rc = -EOPNOTSUPP; + goto unlock; + } + dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE; - else + } else { dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE; + } unlock: spin_unlock_irqrestore(ap->lock, flags);
--
2.7.4