From: Laurent Pinchart Date: Fri, 25 May 2018 19:39:22 +0300 Subject: drm/omap: gem: Don't take struct_mutex to get GEM object mmap offset Git-commit: dc8c9aeee5098688c1085691213fb9a703bf20ad Patch-mainline: v4.19-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 GEM objects mmap offsets are created by calling drm_gem_create_mmap_offset_size() that doesn't need struct_mutex protection as it includes its own locking, based on a size that is static across the object's life time. Remove the unneeded struct_mutex locking. Signed-off-by: Laurent Pinchart Reviewed-by: Daniel Vetter Reviewed-by: Tomi Valkeinen Signed-off-by: Tomi Valkeinen Acked-by: Petr Tesarik --- drivers/gpu/drm/omapdrm/omap_gem.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) --- a/drivers/gpu/drm/omapdrm/omap_gem.c +++ b/drivers/gpu/drm/omapdrm/omap_gem.c @@ -137,14 +137,12 @@ struct omap_drm_usergart { */ /** get mmap offset */ -static u64 mmap_offset(struct drm_gem_object *obj) +u64 omap_gem_mmap_offset(struct drm_gem_object *obj) { struct drm_device *dev = obj->dev; int ret; size_t size; - WARN_ON(!mutex_is_locked(&dev->struct_mutex)); - /* Make it mmapable */ size = omap_gem_mmap_size(obj); ret = drm_gem_create_mmap_offset_size(obj, size); @@ -178,7 +176,7 @@ static void omap_gem_evict_entry(struct struct omap_drm_private *priv = obj->dev->dev_private; int n = priv->usergart[fmt].height; size_t size = PAGE_SIZE * n; - loff_t off = mmap_offset(obj) + + loff_t off = omap_gem_mmap_offset(obj) + (entry->obj_pgoff << PAGE_SHIFT); const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE); @@ -319,16 +317,6 @@ u32 omap_gem_flags(struct drm_gem_object return to_omap_bo(obj)->flags; } -u64 omap_gem_mmap_offset(struct drm_gem_object *obj) -{ - u64 offset; - - mutex_lock(&obj->dev->struct_mutex); - offset = mmap_offset(obj); - mutex_unlock(&obj->dev->struct_mutex); - return offset; -} - /** get mmap size */ size_t omap_gem_mmap_size(struct drm_gem_object *obj) {