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path: root/drivers/misc/hpilo.h
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Diffstat (limited to 'drivers/misc/hpilo.h')
-rw-r--r--drivers/misc/hpilo.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/misc/hpilo.h b/drivers/misc/hpilo.h
index 38576050776a..247eb386a973 100644
--- a/drivers/misc/hpilo.h
+++ b/drivers/misc/hpilo.h
@@ -44,9 +44,20 @@ struct ilo_hwinfo {
struct pci_dev *ilo_dev;
+ /*
+ * open_lock serializes ccb_cnt during open and close
+ * [ irq disabled ]
+ * -> alloc_lock used when adding/removing/searching ccb_alloc,
+ * which represents all ccbs open on the device
+ * --> fifo_lock controls access to fifo queues shared with hw
+ *
+ * Locks must be taken in this order, but open_lock and alloc_lock
+ * are optional, they do not need to be held in order to take a
+ * lower level lock.
+ */
+ spinlock_t open_lock;
spinlock_t alloc_lock;
spinlock_t fifo_lock;
- spinlock_t open_lock;
struct cdev cdev;
};