RE: [PATCH 5/8] Drivers: hv: vmbus: Use channel_mutex in channel_vp_mapping_show()

[Michael Kelley]

From: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx> Sent: Wednesday, June 17, 2020 9:47 AM
> 
> The primitive currently uses channel->lock to protect the loop over
> sc_list w.r.t. list additions/deletions but it doesn't protect the
> target_cpu(s) loads w.r.t. a concurrent target_cpu_store(): while the
> data races on target_cpu are hardly of any concern here, replace the
> channel->lock critical section with a channel_mutex critical section
> and extend the latter to include the loads of target_cpu; this same
> pattern is also used in hv_synic_cleanup().
> 
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx>
> ---
>  drivers/hv/vmbus_drv.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)

Reviewed-By: Michael Kelley <mikelley@xxxxxxxxxxxxx>