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>
This commit is contained in:
Gavin Shan 2012-09-07 22:44:06 +00:00 committed by Benjamin Herrenschmidt
parent 968f968f9b
commit 646a849940
2 changed files with 18 additions and 0 deletions

View File

@ -146,6 +146,17 @@ struct eeh_ops {
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_early(struct device_node *dn) { }
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 */

View File

@ -92,6 +92,9 @@ struct eeh_ops *eeh_ops = NULL;
int eeh_subsystem_enabled;
EXPORT_SYMBOL(eeh_subsystem_enabled);
/* Global EEH mutex */
DEFINE_MUTEX(eeh_mutex);
/* Lock to avoid races due to multiple reports of an error */
static DEFINE_RAW_SPINLOCK(confirm_error_lock);