Re: [PATCH] staging: most: video: replace BUG_ON with WARN_ON_ONCE

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Mar 05, 2026 at 05:17:40PM -0800, Iman Reihanian wrote:
> BUG_ON causes a kernel panic if the condition is true, which is
> too severe for this cleanup check on module exit. Replace it with
> WARN_ON_ONCE to emit a warning and allow the system to continue.
> 
> Signed-off-by: Iman Reihanian <ireihani@uci.edu>
> ---
>  drivers/staging/most/video/video.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/most/video/video.c b/drivers/staging/most/video/video.c
> index 04351f8ccccf..279ec98aa70e 100644
> --- a/drivers/staging/most/video/video.c
> +++ b/drivers/staging/most/video/video.c
> @@ -577,7 +577,7 @@ static void __exit comp_exit(void)
>  
>  	most_deregister_configfs_subsys(&comp);
>  	most_deregister_component(&comp);
> -	BUG_ON(!list_empty(&video_devices));
> +	WARN_ON_ONCE(!list_empty(&video_devices));

This really doesn't "solve" anything, does it?  If panic-on-warn is
enabled, you still crashed the machine :(

How about fixing the root cause if this could ever happen?

thanks,

greg k-h