Re: [PATCH v4] drm/i915/guc: Stop using mutex while sending CTB messages

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+               /* CTB_RECV lock will be used with irq disabled */

...will be used inside the interrupt handler

I think is a more descriptive comment.

Well, we usually call intel_guc_ct_event_handler() from irq handler,
but we are also calling it from guc_enable_communication(), that's
outside irq handler (but with irq disabled)

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