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    Subject[PATCH 5.15 865/917] drm/i915/guc: Fix blocked context accounting
    Date
    From: Matthew Brost <matthew.brost@intel.com>

    commit fc30a6764a54dea42291aeb7009bef7aa2fc1cd4 upstream.

    Prior to this patch the blocked context counter was cleared on
    init_sched_state (used during registering a context & resets) which is
    incorrect. This state needs to be persistent or the counter can read the
    incorrect value resulting in scheduling never getting enabled again.

    Fixes: 62eaf0ae217d ("drm/i915/guc: Support request cancellation")
    Signed-off-by: Matthew Brost <matthew.brost@intel.com>
    Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20210909164744.31249-2-matthew.brost@intel.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
    +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
    @@ -152,7 +152,7 @@ static inline void init_sched_state(stru
    {
    /* Only should be called from guc_lrc_desc_pin() */
    atomic_set(&ce->guc_sched_state_no_lock, 0);
    - ce->guc_state.sched_state = 0;
    + ce->guc_state.sched_state &= SCHED_STATE_BLOCKED_MASK;
    }

    static inline bool

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