We don't need to hold onto mode_config.mutex any more to keep the fb
objects around. And locking dev->struct_mutex is also not required,
since omap_gem_describe only reads data anyway. And for a debug
interface it's better to grab fewer locks in case the driver is
deadlocked already ...
The only thing we need is to hold onto mode_config.fb_lock to ensure
the user-created fbs don't disappear. The fbcon fb doesn't need any
protection, since it lives as long as the driver (and so the debugfs
files) itself. And if the teardown/setup isn't following the right
sequence grabbing locks won't prevent a NULL deref on priv->fbdev if
the fb is not yet (or no longer) there.
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
---
drivers/staging/omapdrm/omap_debugfs.c | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/drivers/staging/omapdrm/omap_debugfs.c
b/drivers/staging/omapdrm/omap_debugfs.c
index e95540b..2bf0664 100644
--- a/drivers/staging/omapdrm/omap_debugfs.c
+++ b/drivers/staging/omapdrm/omap_debugfs.c
@@ -57,17 +57,6 @@ static int fb_show(struct seq_file *m, void *arg)
struct drm_device *dev = node->minor->dev;
struct omap_drm_private *priv = dev->dev_private;
struct drm_framebuffer *fb;
- int ret;
-
- ret = mutex_lock_interruptible(&dev->mode_config.mutex);
- if (ret)
- return ret;
-
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret) {
- mutex_unlock(&dev->mode_config.mutex);
- return ret;
- }
seq_printf(m, "fbcon ");
omap_framebuffer_describe(priv->fbdev->fb, m);
@@ -82,9 +71,6 @@ static int fb_show(struct seq_file *m, void *arg)
}
mutex_unlock(&dev->mode_config.fb_lock);
- mutex_unlock(&dev->struct_mutex);
- mutex_unlock(&dev->mode_config.mutex);
-
return 0;
}
--
1.7.10.4
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