linux-kernel - Re: [PATCH] ata: set ncq_prio_enabled if device has support

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Date:   Thu, 20 Oct 2016 10:07:36 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Adam Manzanares <adam.manzanares@...t.com>
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        Adam Manzanares <adam.manzanares@....com>
Subject: Re: [PATCH] ata: set ncq_prio_enabled if device has support

Hello, Adam.

Applied to libata/for-4.10 with minor edits.

Thanks!

------ 8< ------
>From 4e647d960c510e0d5cd700058fb8ddd529c390ee Mon Sep 17 00:00:00 2001
From: Adam Manzanares <adam.manzanares@...t.com>
Date: Wed, 19 Oct 2016 20:40:19 -0700
Subject: [PATCH] ata: set ncq_prio_enabled iff device has support

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 <adam.manzanares@....com>
Signed-off-by: Tejun Heo <tj@...nel.org>
---
 drivers/ata/libata-core.c |  3 +--
 drivers/ata/libata-scsi.c | 10 ++++++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b294339..43842fd 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 87597a3..49c09d8 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -323,10 +323,16 @@ static ssize_t ata_ncq_prio_enable_store(struct device *device,
 		goto unlock;
 	}
 
-	if (input)
+	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