[igt-dev] [PATCH i-g-t] Make force work with multiple drivers available

[Petri Latvala]

On Fri, Jan 11, 2019 at 11:13:37AM -0200, Rodrigo Siqueira wrote:
> The force option allows users to specify which driver they want that IGT
> uses. Nonetheless, if the user has two or more loaded drivers in his
> system, the force option will not work as expected because IGT will take
> the first driver found at /dev/dri. This problem can be reproduced in a
> QEMU VM that using Bochs and VKMS. This patch handles this scenario by
> ensuring that IGT uses the forced module specified via IGT_FORCE_DRIVER.
> 
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>
> ---
>  lib/drmtest.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/drmtest.c b/lib/drmtest.c
> index 35914c50..7c124ac6 100644
> --- a/lib/drmtest.c
> +++ b/lib/drmtest.c
> @@ -250,10 +250,8 @@ static int open_device(const char *name, unsigned int chipset)
>  		goto err;
>  
>  	forced = forced_driver();
> -	if (forced && chipset == DRIVER_ANY && !strcmp(forced, dev_name)) {
> -		igt_debug("Force option used: Using driver %s\n", dev_name);
> -		return fd;
> -	}
> +	if (forced && chipset == DRIVER_ANY && strcmp(forced, dev_name))
> +		goto err;


Yep, an obvious logic error by me.

Reviewed-by: Petri Latvala <petri.latvala at intel.com>

and merging this momentarily.