Re: [PATCH net] netpoll: Use rtnl_dereference() for npinfo pointer access

[Jacob Keller]

On 11/21/2024 6:58 AM, Breno Leitao wrote:
> In the __netpoll_setup() function, when accessing the device's npinfo
> pointer, replace rcu_access_pointer() with rtnl_dereference(). This
> change is more appropriate, as suggested by Herbert Xu.
> 
> The function is called with the RTNL mutex held, and the pointer is
> being dereferenced later, so, dereference earlier and just reuse the
> pointer for the if/else.
> 
> The replacement ensures correct pointer access while maintaining
> the existing locking and RCU semantics of the netpoll subsystem.
> 
> Fixes: c75964e40e69 ("netpoll: Use rtnl_dereference() for npinfo pointer access")
> Suggested-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
> ---
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>