[PATCH 011 of 16] knfsd: svcrpc: WARN() instead of returning an error from svc_take_page

[NeilBrown <neilb@suse.de>]

Every caller of svc_take_page ignores its return value and assumes it
succeeded.  So just WARN() instead of returning an ignored error.  This
would have saved some time debugging a recent nfsd4 problem.

If there are still failure cases here, then the result is probably that we
overwrite an earlier part of the reply while xdr-encoding.

While the corrupted reply is a nasty bug, it would be worse to panic here
and create the possibility of a remote DOS; hence WARN() instead of BUG().

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
 ./include/linux/sunrpc/svc.h |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff ./include/linux/sunrpc/svc.h~current~ ./include/linux/sunrpc/svc.h
--- ./include/linux/sunrpc/svc.h~current~	2006-04-03 15:12:15.000000000 +1000
+++ ./include/linux/sunrpc/svc.h	2006-04-03 15:12:15.000000000 +1000
@@ -197,15 +197,13 @@ svc_take_res_page(struct svc_rqst *rqstp
 	return rqstp->rq_respages[rqstp->rq_resused++];
 }
 
-static inline int svc_take_page(struct svc_rqst *rqstp)
+static inline void svc_take_page(struct svc_rqst *rqstp)
 {
-	if (rqstp->rq_arghi <= rqstp->rq_argused)
-		return -ENOMEM;
+	WARN_ON(rqstp->rq_arghi <= rqstp->rq_argused);
 	rqstp->rq_arghi--;
 	rqstp->rq_respages[rqstp->rq_resused] =
 		rqstp->rq_argpages[rqstp->rq_arghi];
 	rqstp->rq_resused++;
-	return 0;
 }
 
 static inline void svc_pushback_allpages(struct svc_rqst *rqstp)