powerpc/eeh: Introduce global mutex
The patch introduces global mutex for EEH so that the core data
structures can be protected by that. Also, 2 inline functions
are exported for that: eeh_lock() and eeh_unlock().
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index f77b6d7..248b3d9 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -146,6 +146,17 @@
extern struct eeh_ops *eeh_ops;
extern int eeh_subsystem_enabled;
+extern struct mutex eeh_mutex;
+
+static inline void eeh_lock(void)
+{
+ mutex_lock(&eeh_mutex);
+}
+
+static inline void eeh_unlock(void)
+{
+ mutex_unlock(&eeh_mutex);
+}
/*
* Max number of EEH freezes allowed before we consider the device
@@ -206,6 +217,10 @@
static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
+
+static inline void eeh_lock(void) { }
+static inline void eeh_unlock(void) { }
+
#define EEH_POSSIBLE_ERROR(val, type) (0)
#define EEH_IO_ERROR_VALUE(size) (-1UL)
#endif /* CONFIG_EEH */