Re: [PATCH v7 12/20] SUNRPC: remove call_allocate() BUG_ON if p_arglen=0 to allow RPC with void arg

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On Tue, 25 Jun 2024, Mike Snitzer wrote:
> This is needed for the LOCALIO protocol's GETUUID RPC which takes a
> void arg.  The LOCALIO protocol spec in rpcgen syntax is:
> 
> /* raw RFC 9562 UUID */
> typedef u8 uuid_t<UUID_SIZE>;
> 
> program NFS_LOCALIO_PROGRAM {
>     version LOCALIO_V1 {
>         void
>             NULL(void) = 0;
> 
>         uuid_t
>             GETUUID(void) = 1;
>     } = 1;
> } = 400122;
> 
> Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
> ---
>  net/sunrpc/clnt.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> index cfd1b1bf7e35..2d7f96103f08 100644
> --- a/net/sunrpc/clnt.c
> +++ b/net/sunrpc/clnt.c
> @@ -1894,7 +1894,6 @@ call_allocate(struct rpc_task *task)
>  		return;
>  
>  	if (proc->p_proc != 0) {
> -		BUG_ON(proc->p_arglen == 0);
>  		if (proc->p_decode != NULL)
>  			BUG_ON(proc->p_replen == 0);
>  	}

I would be in favour get rid of all 5 lines.
I wonder if p_decode is ever NULL.  It would cause
rpcauth_unwrap_resp_decode() problems.

NeilBrown


> -- 
> 2.44.0
> 
> 





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