diff options
Diffstat (limited to 'drivers/video/omap2/omapfb/omapfb.h')
| -rw-r--r-- | drivers/video/omap2/omapfb/omapfb.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/video/omap2/omapfb/omapfb.h b/drivers/video/omap2/omapfb/omapfb.h index 2b5264475ed4..623cd872a367 100644 --- a/drivers/video/omap2/omapfb/omapfb.h +++ b/drivers/video/omap2/omapfb/omapfb.h @@ -62,6 +62,8 @@ struct omapfb2_mem_region { bool alloc; /* allocated by the driver */ bool map; /* kernel mapped by the driver */ atomic_t map_count; + struct rw_semaphore lock; + atomic_t lock_count; }; /* appended to fb_info */ @@ -189,4 +191,18 @@ static inline int omapfb_overlay_enable(struct omap_overlay *ovl, return ovl->disable(ovl); } +static inline struct omapfb2_mem_region * +omapfb_get_mem_region(struct omapfb2_mem_region *rg) +{ + down_read_nested(&rg->lock, rg->id); + atomic_inc(&rg->lock_count); + return rg; +} + +static inline void omapfb_put_mem_region(struct omapfb2_mem_region *rg) +{ + atomic_dec(&rg->lock_count); + up_read(&rg->lock); +} + #endif |