Merge branch 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata

Pull another libata patch from Tejun Heo:
 "One more patch from Adam added.

  It makes libata skip probing for NCQ prio unless the feature is
  explicitly requested by the user. This is necessary because some
  controllers lock up after the optional feature is probed"

* 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
  ata: avoid probing NCQ Prio Support if not explicitly requested

2 files changed, 31 insertions, 20 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f79d09c9419b..9cd0a2d41816 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -787,7 +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_ENABLE) {
+                if (dev->flags & ATA_DFLAG_NCQ_PRIO) {
                         if (class == IOPRIO_CLASS_RT)
                                 tf->hob_nsect |= ATA_PRIO_HIGH <<
                                                  ATA_SHIFT_PRIO;
@@ -2168,6 +2168,11 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev)
         struct ata_port *ap = dev->link->ap;
         unsigned int err_mask;
 
+        if (!(dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) {
+                dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
+                return;
+        }
+
         err_mask = ata_read_log_page(dev,
                                      ATA_LOG_SATA_ID_DEV_DATA,
                                      ATA_LOG_SATA_SETTINGS,
@@ -2180,10 +2185,12 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev)
                 return;
         }
 
-        if (ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3))
+        if (ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)) {
                 dev->flags |= ATA_DFLAG_NCQ_PRIO;
-        else
+        } else {
+                dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
                 ata_dev_dbg(dev, "SATA page does not support priority\n");
+        }
 
 }
 
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index c9abb87a09ea..1f863e757ee4 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -272,7 +272,8 @@ DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
 
 static ssize_t ata_ncq_prio_enable_show(struct device *device,
-                                        struct device_attribute *attr, char *buf)
+                                        struct device_attribute *attr,
+                                        char *buf)
 {
         struct scsi_device *sdev = to_scsi_device(device);
         struct ata_port *ap;
@@ -305,7 +306,6 @@ static ssize_t ata_ncq_prio_enable_store(struct device *device,
         struct ata_port *ap;
         struct ata_device *dev;
         long int input;
-        unsigned long flags;
         int rc;
 
         rc = kstrtol(buf, 10, &input);
@@ -315,28 +315,32 @@ static ssize_t ata_ncq_prio_enable_store(struct device *device,
                 return -EINVAL;
 
         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;
+
+        spin_lock_irq(ap->lock);
+        if (input)
+                dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
+        else
+                dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+
+        dev->link->eh_info.action |= ATA_EH_REVALIDATE;
+        dev->link->eh_info.flags |= ATA_EHI_QUIET;
+        ata_port_schedule_eh(ap);
+        spin_unlock_irq(ap->lock);
+
+        ata_port_wait_eh(ap);
 
         if (input) {
+                spin_lock_irq(ap->lock);
                 if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
-                        rc = -EOPNOTSUPP;
-                        goto unlock;
+                        dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+                        rc = -EIO;
                 }
-
-                dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
-        } else {
-                dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+                spin_unlock_irq(ap->lock);
         }
 
-unlock:
-        spin_unlock_irqrestore(ap->lock, flags);
-
         return rc ? rc : len;
 }