Good catch! But why not put the hctx == NULL check in as a conditional in bt_get() before running the queue? I can't imagine other cases where calling blk_mq_run_hw_queue() with hctx == NULL would be a valid scenario.
The change was meant to be broad in scope. A runtime NULL deref is a rather unfortunate way to determine that there are other invalid scenarios.
But given that both approaches fix the immediate problem, I'd be happy to change the patch as you suggest.
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