Re: [PATCH 2/3] drm/fb-helper: Check fb_deferred_io_init() return value

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Am 20.01.23 um 13:08 schrieb Javier Martinez Canillas:
The fb_deferred_io_init() can fail and return an errno code but currently
there is no check for its return value.

Fix that and propagate to errno to the caller in the case of a failure.

Fixes: d536540f304c ("drm/fb-helper: Add generic fbdev emulation .fb_probe function")
Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>

The error cleanup in this function is already broken; just returning is good enough for now.

Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

---

  drivers/gpu/drm/drm_fbdev_generic.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fbdev_generic.c b/drivers/gpu/drm/drm_fbdev_generic.c
index 0a4c160e0e58..b2df8c03594c 100644
--- a/drivers/gpu/drm/drm_fbdev_generic.c
+++ b/drivers/gpu/drm/drm_fbdev_generic.c
@@ -223,7 +223,9 @@ static int drm_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
  		fbi->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;
fbi->fbdefio = &drm_fbdev_defio;
-		fb_deferred_io_init(fbi);
+		ret = fb_deferred_io_init(fbi);
+		if (ret)
+			return ret;
  	} else {
  		/* buffer is mapped for HW framebuffer */
  		ret = drm_client_buffer_vmap(fb_helper->buffer, &map);

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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