Bug#931507: hda: Fix 1-minute detection delay when i915 module is not available

[Takashi Iwai]

On Fri, 26 Jul 2019 17:05:30 +0200,
Samuel Thibault wrote:
>
> Distribution installation images such as Debian include different sets
> of modules which can be downloaded dynamically. Such images may notably
> include the hda sound modules but not the i915 DRM module, even if the
> latter was enabled at build time, as reported on
> https://bugs.debian.org/931507
>
> In such a case hdac_i915 would be linked in and try to load the i915
> module, fail since it is not there, but still wait for a whole minute
> before giving up binding with it.
>
> This fixes such as case by only waiting for the binding if the module
> was properly loaded (or module support is disabled, in which case i915
> is already compiled-in anyway).
>
> Signed-off-by: Samuel Thibault <samuel....@ens-lyon.org>
> ---
> sound/hda/hdac_i915.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> --- a/sound/hda/hdac_i915.c
> +++ b/sound/hda/hdac_i915.c
> @@ -143,10 +143,14 @@ int snd_hdac_i915_init(struct hdac_bus *
> if (!acomp)
> return -ENODEV;
> if (!acomp->ops) {
> - request_module("i915");
> - /* 60s timeout */
> - wait_for_completion_timeout(&bind_complete,
> - msecs_to_jiffies(60 * 1000));
> +#ifdef CONFIG_MODULES
> + if (request_module("i915") == 0)
> +#endif

Better to use IS_ENABLED(), so that we can avoid ugly ifdef.

if (!IS_ENABLED(CONFIG_MODULES) ||
!request_module("i915")) {
....

thanks,

Takashi