> init_vq() reads the writable num_request_queues and poll_queues module
> parameters both at probe and when recreating virtqueues after suspend
> or reset. However, virtio-blk does not update the blk-mq hardware queue
> count or queue maps on restore.
>
> Increasing poll_queues can therefore remove the completion callback
> from a virtqueue still used for interrupt-driven I/O, leaving requests
> uncompleted. Reducing the effective request queue count through
> num_request_queues can instead leave existing hardware contexts
> indexing beyond the reallocated vblk->vqs array.
>
> Determine the virtqueue count and the split between interrupt-driven
> and polling queues once at probe, and reuse this layout when
> recreating the virtqueues. Changes to these module parameters then
> affect only subsequently probed devices.
>
> Fixes: 0989c41bed96 ("virtio-blk: add num_request_queues module parameter")
> Signed-off-by: Yunye Zhao <[email protected]>
Sashiko has reviewed this patch and found no issues.
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