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-rw-r--r--fs/afs/rxrpc.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 21f43d3acb91..1d075696bf55 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -350,8 +350,17 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
*/
tx_total_len = call->request_size;
if (call->send_pages) {
- tx_total_len += call->last_to - call->first_offset;
- tx_total_len += (call->last - call->first) * PAGE_SIZE;
+ if (call->last == call->first) {
+ tx_total_len += call->last_to - call->first_offset;
+ } else {
+ /* It looks mathematically like you should be able to
+ * combine the following lines with the ones above, but
+ * unsigned arithmetic is fun when it wraps...
+ */
+ tx_total_len += PAGE_SIZE - call->first_offset;
+ tx_total_len += call->last_to;
+ tx_total_len += (call->last - call->first - 1) * PAGE_SIZE;
+ }
}
/* create a call */