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OMAP: DSS2: OMAPFB: Add some locking debug checks

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Trigger WARN_ON() messages from various places in the code in case the
memory region is not currently locked.

Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
This commit is contained in:
Ville Syrjälä 2010-03-17 21:28:50 +02:00 committed by Tomi Valkeinen
parent 3d84b65aa6
commit 1ceafc0091
4 changed files with 13 additions and 0 deletions
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2
drivers/video/omap2/omapfb/omapfb-ioctl.c
View File

@ -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;

6
drivers/video/omap2/omapfb/omapfb-main.c
View File

@ -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];

2
drivers/video/omap2/omapfb/omapfb-sysfs.c
View File

@ -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);

3
drivers/video/omap2/omapfb/omapfb.h
View File

@ -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);
}