[PATCH] drm/i915/guc: Fix flag query helper function to not modify state

[Ceraolo Spurio, Daniele]

On 2/17/2022 1:29 PM, John.C.Harrison at Intel.com wrote:
> From: John Harrison <John.C.Harrison at Intel.com>
>
> A flag query helper was actually writing to the flags word rather than
> just reading. Fix that. Also update the function's comment as it was
> out of date.
>
> NB: No need for a 'Fixes' tag. The test was only ever used inside a
> BUG_ON during context registration. Rather than asserting that the
> condition was true, it was making the condition true. So, in theory,
> there was no consequence because we should never have hit a BUG_ON
> anyway. Which means the write should always have been a no-op.
>
> Signed-off-by: John Harrison <John.C.Harrison at Intel.com>

I seem to have confused patchwork by doing a cut & paste of my r-b from 
a different review, so here it is again:

Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>

Daniele

> ---
>   drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> index b3a429a92c0d..d9f4218f5ef4 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> @@ -174,11 +174,8 @@ static inline void init_sched_state(struct intel_context *ce)
>   __maybe_unused
>   static bool sched_state_is_init(struct intel_context *ce)
>   {
> -	/*
> -	 * XXX: Kernel contexts can have SCHED_STATE_NO_LOCK_REGISTERED after
> -	 * suspend.
> -	 */
> -	return !(ce->guc_state.sched_state &=
> +	/* Kernel contexts can have SCHED_STATE_REGISTERED after suspend. */
> +	return !(ce->guc_state.sched_state &
>   		 ~(SCHED_STATE_BLOCKED_MASK | SCHED_STATE_REGISTERED));
>   }
>