[PATCH] target: Make se_dev_check_online() locking IRQ-safe

[Roland Dreier <roland@kernel.org>]

From: Roland Dreier <roland@purestorage.com>

se_dev_check_online() is called from transport_lookup_cmd_lun(), which
as discussed before may be called from interrupt context.  So it needs
to use spin_lock_irqsave() instead of spin_lock_irq() to avoid
enabling interrupts at the wrong time.

Signed-off-by: Roland Dreier <roland@purestorage.com>
---
 drivers/target/target_core_device.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index fcb8161..f2a4bf2 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -815,12 +815,13 @@ static void se_dev_stop(struct se_device *dev)
 
 int se_dev_check_online(struct se_device *dev)
 {
+	unsigned long flags;
 	int ret;
 
-	spin_lock_irq(&dev->dev_status_lock);
+	spin_lock_irqsave(&dev->dev_status_lock, flags);
 	ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 	       (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
-	spin_unlock_irq(&dev->dev_status_lock);
+	spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 
 	return ret;
 }