diff options
| author | Gavin Shan <shangw@linux.vnet.ibm.com> | 2012-09-07 22:44:06 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-09 23:35:30 (GMT) |
| commit | 646a8499403e049845dda3141ec1ac021f029f11 (patch) | |
| tree | 3b01074605b136f9e3153a533df58af5787c4017 /arch | |
| parent | 968f968f9b9aaa6ff92c20090c600fc7c112af55 (diff) | |
| download | linux-646a8499403e049845dda3141ec1ac021f029f11.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/eeh.h | 15 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh.c | 3 |
2 files changed, 18 insertions, 0 deletions
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 @@ 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 */ diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c index e819448..0ba7e3b 100644 --- a/arch/powerpc/platforms/pseries/eeh.c +++ b/arch/powerpc/platforms/pseries/eeh.c @@ -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); |