From 56e34ee2adb59a35bfa5714bdf4dcb3f4d14a41d Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Mon, 13 Jun 2011 20:55:06 -0700 Subject: [PATCH] target: Make se_dev_check_online() locking IRQ-safe 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 Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_device.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index e25df3b813e..6d93d9684cf 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -813,12 +813,13 @@ 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; }