uio: make import_iovec()/compat_import_iovec() return bytes on success

Currently these functions return < 0 on error, and 0 for success.
Change that so that we return < 0 on error, but number of bytes
for success.

Some callers already treat the return value that way, others need a
slight tweak.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/compat.c b/net/compat.c
index 3f9ce609397f..0f7ded26059e 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -80,9 +80,10 @@ int get_compat_msghdr(struct msghdr *kmsg,
 
         kmsg->msg_iocb = NULL;
 
-        return compat_import_iovec(save_addr ? READ : WRITE,
+        err = compat_import_iovec(save_addr ? READ : WRITE,
                                    compat_ptr(msg.msg_iov), msg.msg_iovlen,
                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
+        return err < 0 ? err : 0;
 }
 
 /* Bleech... */