[PATCH] drm/nouveau: Do not fail module init on debugfs errors

[Timur Tabi]

On Thu, 2025-07-03 at 21:19 +0000, Aaron Thompson wrote:
> From: Aaron Thompson <dev at aaront.org>
> 
> If CONFIG_DEBUG_FS is enabled, nouveau_drm_init() returns an error if it
> fails to create the "nouveau" directory in debugfs. One case where that
> will happen is when debugfs access is restricted by
> CONFIG_DEBUG_FS_ALLOW_NONE or by the boot parameter debugfs=off, which
> cause the debugfs APIs to return -EPERM.
> 
> So just ignore errors from debugfs. Note that nouveau_debugfs_root may
> be an error now, but that is a standard pattern for debugfs. From
> include/linux/debugfs.h:
> 
> "NOTE: it's expected that most callers should _ignore_ the errors
> returned by this function. Other debugfs functions handle the fact that
> the "dentry" passed to them could be an error and they don't crash in
> that case. Drivers should generally work fine even if debugfs fails to
> init anyway."
> 
> Fixes: 97118a1816d2 ("drm/nouveau: create module debugfs root")

Oof, sorry about that.  I should have noticed this behavior when I reviewed this patch.

Acked-by: Timur Tabi <ttabi at nvidia.com>