From 1ceafc00910439c8e5450fae189b69427725992c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 17 Mar 2010 21:28:50 +0200 Subject: [PATCH] OMAP: DSS2: OMAPFB: Add some locking debug checks MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Trigger WARN_ON() messages from various places in the code in case the memory region is not currently locked. Signed-off-by: Ville Syrjälä Signed-off-by: Tomi Valkeinen --- drivers/video/omap2/omapfb/omapfb-ioctl.c | 2 ++ drivers/video/omap2/omapfb/omapfb-main.c | 6 ++++++ drivers/video/omap2/omapfb/omapfb-sysfs.c | 2 ++ drivers/video/omap2/omapfb/omapfb.h | 3 +++ 4 files changed, 13 insertions(+) diff --git a/drivers/video/omap2/omapfb/omapfb-ioctl.c b/drivers/video/omap2/omapfb/omapfb-ioctl.c index 7975a99c33f9..d1f56d37405f 100644 --- a/drivers/video/omap2/omapfb/omapfb-ioctl.c +++ b/drivers/video/omap2/omapfb/omapfb-ioctl.c @@ -222,6 +222,7 @@ static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi) rg = ofbi->region; down_write_nested(&rg->lock, rg->id); + atomic_inc(&rg->lock_count); if (atomic_read(&rg->map_count)) { r = -EBUSY; @@ -252,6 +253,7 @@ static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi) } out: + atomic_dec(&rg->lock_count); up_write(&rg->lock); return r; diff --git a/drivers/video/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c index a3f72ba79958..a545e8d4817f 100644 --- a/drivers/video/omap2/omapfb/omapfb-main.c +++ b/drivers/video/omap2/omapfb/omapfb-main.c @@ -668,6 +668,8 @@ int check_fb_var(struct fb_info *fbi, struct fb_var_screeninfo *var) DBG("check_fb_var %d\n", ofbi->id); + WARN_ON(!atomic_read(&ofbi->region->lock_count)); + r = fb_mode_to_dss_mode(var, &mode); if (r) { DBG("cannot convert var to omap dss mode\n"); @@ -873,6 +875,8 @@ int omapfb_setup_overlay(struct fb_info *fbi, struct omap_overlay *ovl, int rotation = var->rotate; int i; + WARN_ON(!atomic_read(&ofbi->region->lock_count)); + for (i = 0; i < ofbi->num_overlays; i++) { if (ovl != ofbi->overlays[i]) continue; @@ -966,6 +970,8 @@ int omapfb_apply_changes(struct fb_info *fbi, int init) fill_fb(fbi); #endif + WARN_ON(!atomic_read(&ofbi->region->lock_count)); + for (i = 0; i < ofbi->num_overlays; i++) { ovl = ofbi->overlays[i]; diff --git a/drivers/video/omap2/omapfb/omapfb-sysfs.c b/drivers/video/omap2/omapfb/omapfb-sysfs.c index 1e714bb48d39..51c13c366bf3 100644 --- a/drivers/video/omap2/omapfb/omapfb-sysfs.c +++ b/drivers/video/omap2/omapfb/omapfb-sysfs.c @@ -453,6 +453,7 @@ static ssize_t store_size(struct device *dev, struct device_attribute *attr, rg = ofbi->region; down_write_nested(&rg->lock, rg->id); + atomic_inc(&rg->lock_count); if (atomic_read(&rg->map_count)) { r = -EBUSY; @@ -484,6 +485,7 @@ static ssize_t store_size(struct device *dev, struct device_attribute *attr, r = count; out: + atomic_dec(&rg->lock_count); up_write(&rg->lock); unlock_fb_info(fbi); diff --git a/drivers/video/omap2/omapfb/omapfb.h b/drivers/video/omap2/omapfb/omapfb.h index 676b55d98941..1305fc9880ba 100644 --- a/drivers/video/omap2/omapfb/omapfb.h +++ b/drivers/video/omap2/omapfb/omapfb.h @@ -56,6 +56,7 @@ struct omapfb2_mem_region { bool map; /* kernel mapped by the driver */ atomic_t map_count; struct rw_semaphore lock; + atomic_t lock_count; }; /* appended to fb_info */ @@ -166,11 +167,13 @@ 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); } -- GitLab