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OMAP: DSS2: OMAPFB: Make lockdep happy

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When more than one memory region needs to be lockd at the same time use
the memory region id to fix the order in which the locks are taken. Also
one needs to use the _nested() versions of the locking primitives. The
memory region id can serve as the lock class there as well.

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 21:42:06 +02:00 committed by Tomi Valkeinen
parent 2f642a1750
commit 3d84b65aa6
3 changed files with 36 additions and 13 deletions
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45
drivers/video/omap2/omapfb/omapfb-ioctl.c
View file

@ -55,7 +55,7 @@ static struct omapfb2_mem_region *get_mem_region(struct omapfb_info *ofbi,
if (mem_idx >= fbdev->num_fbs)
return NULL;
return omapfb_get_mem_region(&fbdev->regions[mem_idx]);
return &fbdev->regions[mem_idx];
}
static int omapfb_setup_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
@ -77,20 +77,30 @@ static int omapfb_setup_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
/* XXX uses only the first overlay */
ovl = ofbi->overlays[0];
old_rg = omapfb_get_mem_region(ofbi->region);
old_rg = ofbi->region;
new_rg = get_mem_region(ofbi, pi->mem_idx);
if (!new_rg) {
r = -EINVAL;
goto put_old;
goto out;
}
/* Take the locks in a specific order to keep lockdep happy */
if (old_rg->id < new_rg->id) {
omapfb_get_mem_region(old_rg);
omapfb_get_mem_region(new_rg);
} else if (new_rg->id < old_rg->id) {
omapfb_get_mem_region(new_rg);
omapfb_get_mem_region(old_rg);
} else
omapfb_get_mem_region(old_rg);
if (pi->enabled && !new_rg->size) {
/*
* This plane's memory was freed, can't enable it
* until it's reallocated.
*/
r = -EINVAL;
goto put_new;
goto put_mem;
}
ovl->get_overlay_info(ovl, &old_info);
@ -135,8 +145,15 @@ static int omapfb_setup_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
if (ovl->manager)
ovl->manager->apply(ovl->manager);
omapfb_put_mem_region(new_rg);
omapfb_put_mem_region(old_rg);
/* Release the locks in a specific order to keep lockdep happy */
if (old_rg->id > new_rg->id) {
omapfb_put_mem_region(old_rg);
omapfb_put_mem_region(new_rg);
} else if (new_rg->id > old_rg->id) {
omapfb_put_mem_region(new_rg);
omapfb_put_mem_region(old_rg);
} else
omapfb_put_mem_region(old_rg);
return 0;
@ -147,10 +164,16 @@ static int omapfb_setup_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
}
ovl->set_overlay_info(ovl, &old_info);
put_new:
omapfb_put_mem_region(new_rg);
put_old:
omapfb_put_mem_region(old_rg);
put_mem:
/* Release the locks in a specific order to keep lockdep happy */
if (old_rg->id > new_rg->id) {
omapfb_put_mem_region(old_rg);
omapfb_put_mem_region(new_rg);
} else if (new_rg->id > old_rg->id) {
omapfb_put_mem_region(new_rg);
omapfb_put_mem_region(old_rg);
} else
omapfb_put_mem_region(old_rg);
out:
dev_err(fbdev->dev, "setup_plane failed\n");
@ -198,7 +221,7 @@ static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
rg = ofbi->region;
down_write(&rg->lock);
down_write_nested(&rg->lock, rg->id);
if (atomic_read(&rg->map_count)) {
r = -EBUSY;

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

@ -452,7 +452,7 @@ static ssize_t store_size(struct device *dev, struct device_attribute *attr,
rg = ofbi->region;
down_write(&rg->lock);
down_write_nested(&rg->lock, rg->id);
if (atomic_read(&rg->map_count)) {
r = -EBUSY;

2
drivers/video/omap2/omapfb/omapfb.h
View file

@ -165,7 +165,7 @@ static inline int omapfb_overlay_enable(struct omap_overlay *ovl,
static inline struct omapfb2_mem_region *
omapfb_get_mem_region(struct omapfb2_mem_region *rg)
{
down_read(&rg->lock);
down_read_nested(&rg->lock, rg->id);
return rg;
}