diff options
Diffstat (limited to 'drivers/staging/unisys/include/visorbus.h')
| -rw-r--r-- | drivers/staging/unisys/include/visorbus.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/staging/unisys/include/visorbus.h b/drivers/staging/unisys/include/visorbus.h index e4a21e42e868..9235536fa75f 100644 --- a/drivers/staging/unisys/include/visorbus.h +++ b/drivers/staging/unisys/include/visorbus.h @@ -113,7 +113,8 @@ struct visor_driver { struct driver_attribute version_attr; }; -#define to_visor_driver(x) container_of(x, struct visor_driver, driver) +#define to_visor_driver(x) ((x) ? \ + (container_of(x, struct visor_driver, driver)) : (NULL)) /** A device type for things "plugged" into the visorbus bus */ @@ -200,6 +201,8 @@ bool visorchannel_signalremove(struct visorchannel *channel, u32 queue, void *msg); bool visorchannel_signalinsert(struct visorchannel *channel, u32 queue, void *msg); +bool visorchannel_signalempty(struct visorchannel *channel, u32 queue); + int visorchannel_signalqueue_slots_avail(struct visorchannel *channel, u32 queue); int visorchannel_signalqueue_max_slots(struct visorchannel *channel, u32 queue); |