Hi,

On Wed, Oct 20, 2021 at 06:57:40PM +0200, Javier Martinez Canillas wrote:

This reverts commit b3484d2b03e4c940a9598aa841a52d69729c582a.

That change attempted to improve the DRM drivers fbdev emulation device names to avoid having confusing names like "simpledrmdrmfb" in /proc/fb.

But unfortunately, there are user-space programs such as pm-utils that match against the fbdev names and so broke after the mentioned commit.

Since the names in /proc/fb are used by tools that consider it an uAPI, let's restore the old names even when this lead to silly names like the one mentioned above.

I would like to ask about the fate of this patch. It doesn't seem to have been picked up by anyone, does it?

Thanks, Johannes

Fixes: b3484d2b03e4 ("drm/fb-helper: improve DRM fbdev emulation device names") Reported-by: Johannes Stezenbach js@sig21.net Signed-off-by: Javier Martinez Canillas javierm@redhat.com Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com

---

Changes in v2:

• Add a comment explaining that the current /proc/fb names are an uAPI.
• Add a Fixes: tag so it can be cherry-picked by stable kernels.
• Add Ville Syrjälä's Reviewed-by tag.

drivers/gpu/drm/drm_fb_helper.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 8e7a124d6c5a..22bf690910b2 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1743,7 +1743,13 @@ void drm_fb_helper_fill_info(struct fb_info *info, sizes->fb_width, sizes->fb_height);

info->par = fb_helper;

• snprintf(info->fix.id, sizeof(info->fix.id), "%s",

• /*

• * The DRM drivers fbdev emulation device name can be confusing if the
  

• * driver name also has a "drm" suffix on it. Leading to names such as
  

• * "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't
  

• * be changed due user-space tools (e.g: pm-utils) matching against it.
  

• */
  

• snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb", fb_helper->dev->driver->name);

}

2.31.1