FAILED: patch "[PATCH] nfs: remove WARN_ON_ONCE from nfs_direct_good_bytes" failed to apply to 3.19-stable tree

The patch below does not apply to the 3.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: Peng Tao <[email protected]>
Date: Thu, 9 Apr 2015 23:02:17 +0800
Subject: [PATCH] nfs: remove WARN_ON_ONCE from nfs_direct_good_bytes

For flexfiles driver, we might choose to read from mirror index other than 0 while mirror_count is always 1 for read.

index e97a67e40b48..eeb52b434e6f 100644
@@ -129,8 +129,6 @@ nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
 	int i;
 	ssize_t count;
 
-	WARN_ON_ONCE(hdr->pgio_mirror_idx >= dreq->mirror_count);
-
 	if (dreq->mirror_count == 1) {
 		dreq->mirrors[hdr->pgio_mirror_idx].count += hdr->good_bytes;
 		dreq->count += hdr->good_bytes;