Drivers: hv: vmbus: Synchronize init_vp_index() vs. CPU hotplug
init_vp_index() may access the cpu_online_mask mask via its calls of cpumask_of_node(). Make sure to protect these accesses with a cpus_read_lock() critical section. Also, remove some (hardcoded) instances of CPU(0) from init_vp_index() and replace them with VMBUS_CONNECT_CPU. The connect CPU can not go offline, since Hyper-V does not provide a way to change it. Finally, order the accesses of target_cpu from init_vp_index() and hv_synic_cleanup() by relying on the channel_mutex; this is achieved by moving the call of init_vp_index() into vmbus_process_offer(). Signed-off-by:Andrea Parri (Microsoft) <parri.andrea@gmail.com> Link: https://lore.kernel.org/r/20200406001514.19876-10-parri.andrea@gmail.comReviewed-by:
Michael Kelley <mikelley@microsoft.com> Signed-off-by:
Wei Liu <wei.liu@kernel.org>
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