Various cleanups to the DRM core initialization and exit handlers:
- Register chrdev last: Once register_chrdev() returns, open() will
succeed on the given chrdevs. This is usually not an issue, as no
chardevs are registered, yet. However, nodes can be created by
user-space via mknod(2), even though such major/minor combinations are
unknown to the kernel. Avoid calling into drm_stub_open() in those
cases.
Again, drm_stub_open() would just bail out as the inode is unknown,
but it's really non-obvious if you hack on drm_stub_open().
- Unify error-paths into just one label. All the error-path helpers can
be called even though the constructors were not called yet, or failed.
Hence, just call all cleanups unconditionally.
- Call into drm_global_release(). This is a no-op, but provides
debugging helpers in case there're GLOBALS left on module unload. This
function was unused until now.
- Use DRM_ERROR() instead of printk(), and also print the error-code on
failure (even if it is static!).
- Don't throw away error-codes of register_chrdev()!
- Don't hardcode -1 as errno. This is just plain wrong.
- Order exit-handlers in the exact reverse order of initialization
(except if the order actually matters for syncing-reasons, which is
not the case here, though).
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
---
drivers/gpu/drm/drm_drv.c | 36 ++++++++++++++++++------------------
1 file changed, 18 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 58299f7..bf2924b 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -829,50 +829,50 @@ static const struct file_operations drm_stub_fops = {
static int __init drm_core_init(void)
{
- int ret = -ENOMEM;
+ int ret;
drm_global_init();
drm_connector_ida_init();
idr_init(&drm_minors_idr);
- if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
- goto err_p1;
-
ret = drm_sysfs_init();
if (ret < 0) {
- printk(KERN_ERR "DRM: Error creating drm class.\n");
- goto err_p2;
+ DRM_ERROR("Cannot create DRM class: %d\n", ret);
+ goto error;
}
drm_debugfs_root = debugfs_create_dir("dri", NULL);
if (!drm_debugfs_root) {
- DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
- ret = -1;
- goto err_p3;
+ ret = -ENOMEM;
+ DRM_ERROR("Cannot create debugfs-root: %d\n", ret);
+ goto error;
}
+ ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops);
+ if (ret < 0)
+ goto error;
+
DRM_INFO("Initialized %s %d.%d.%d %s\n",
CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
return 0;
-err_p3:
- drm_sysfs_destroy();
-err_p2:
- unregister_chrdev(DRM_MAJOR, "drm");
+error:
+ debugfs_remove(drm_debugfs_root);
+ drm_sysfs_destroy();
idr_destroy(&drm_minors_idr);
-err_p1:
+ drm_connector_ida_destroy();
+ drm_global_release();
return ret;
}
static void __exit drm_core_exit(void)
{
+ unregister_chrdev(DRM_MAJOR, "drm");
debugfs_remove(drm_debugfs_root);
drm_sysfs_destroy();
-
- unregister_chrdev(DRM_MAJOR, "drm");
-
- drm_connector_ida_destroy();
idr_destroy(&drm_minors_idr);
+ drm_connector_ida_destroy();
+ drm_global_release();
}
module_init(drm_core_init);
--
2.5.1
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