Quoting Rob Clark (2017-07-11 14:38:22)
> +static unsigned long hijack_firmware_fb(struct drm_device *dev)
> +{
> + struct msm_drm_private *priv = dev->dev_private;
> + unsigned long size;
> + int i;
> +
> + /* if we have simplefb/efifb, find it's aperture and hijack
> + * that before we kick out the firmware fb's.
> + *
> + * TODO we probably should hold registration_lock
> + */
> + for (i = 0; i < FB_MAX; i++) {
> + struct fb_info *fb = get_fb_info(i);
> +
> + if (IS_ERR_OR_NULL(fb))
> + continue;
> +
> + if (!fb->apertures->count)
Does get_fb_info() not return a reference if its apertures->count==0?
> + continue;
> +
> + /* if we find efifb or simplefb, we are about to
> + * kick them out, so hijack their memory:
> + */
> + if ((strcmp(fb->fix.id, "EFI VGA") == 0) ||
> + (strcmp(fb->fix.id, "simple") == 0)) {
> +
> + priv->vram.paddr = fb->apertures->ranges[0].base;
> + size = fb->apertures->ranges[0].size;
> + }
> +
> + put_fb_info(fb);
> +
> + if (size)
> + return size;
size is never initialised to 0. Perhaps just return the reference to the
matching fb? Hopefully sidestepping a few of the worries about it
disappearing during the probe.
-Chris
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