Re: [PATCH 1/1] md/raid10: Remove rcu_dereference when it doesn't need rcu lock to protect

On 8/9/21 12:01 PM, Xiao Ni wrote:

In the first loop of function raid10_handle_discard. It already
determines which disk need to handle discard request and add the
rdev reference count. So the conf->mirrors will not change until
all bios come back from underlayer disks. It doesn't need to use
rcu_dereference to get rdev.

Can rdev be removed between the first loop and the second loop?

Thanks,
Guoqing