Re: [PATCH v2 09/15] accel/qda: Add DMA-backed GEM objects and memory manager integration

[Markus Elfring]

…
> +++ b/drivers/accel/qda/qda_memory_manager.c
…
> +int qda_memory_manager_assign_device(struct qda_memory_manager *mem_mgr,
> +				     struct drm_file *file_priv)
> +{
…
> +	current_pid = qda_priv->pid;
> 	+
> +	mutex_lock(&mem_mgr->process_assignment_lock);
…
> +unlock_and_return:
> +	mutex_unlock(&mem_mgr->process_assignment_lock);
> +
> +	return ret;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&mem_mgr->process_assignment_lock);”?
https://elixir.bootlin.com/linux/v7.2/source/include/linux/mutex.h#L253

Regards,
Markus