Merge tag '6.2-rc4-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:

 - important fix for packet signature calculation error

 - three fixes to correct DFS deadlock, and DFS refresh problem

 - remove an unused DFS function, and duplicate tcon refresh code

 - DFS cache lookup fix

 - uninitialized rc fix

* tag '6.2-rc4-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: remove unused function
  cifs: do not include page data when checking signature
  cifs: fix return of uninitialized rc in dfs_cache_update_tgthint()
  cifs: handle cache lookup errors different than -ENOENT
  cifs: remove duplicate code in __refresh_tcon()
  cifs: don't take exclusive lock for updating target hints
  cifs: avoid re-lookups in dfs_cache_find()
  cifs: fix potential deadlock in cache_refresh_path()

fs/cifs/dfs_cache.h

@@ -35,9 +35,6 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses, const struct nl
 		   struct dfs_cache_tgt_list *tgt_list);
 int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
 			 struct dfs_cache_tgt_list *tgt_list);
-int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,
-			     const struct nls_table *cp, int remap, const char *path,
-			     const struct dfs_cache_tgt_iterator *it);
 void dfs_cache_noreq_update_tgthint(const char *path, const struct dfs_cache_tgt_iterator *it);
 int dfs_cache_get_tgt_referral(const char *path, const struct dfs_cache_tgt_iterator *it,
 			       struct dfs_info3_param *ref);

fs/cifs/smb2pdu.c

@@ -4163,12 +4163,15 @@ smb2_readv_callback(struct mid_q_entry *mid)
 				(struct smb2_hdr *)rdata->iov[0].iov_base;
 	struct cifs_credits credits = { .value = 0, .instance = 0 };
 	struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
-				 .rq_nvec = 1,
-				 .rq_pages = rdata->pages,
-				 .rq_offset = rdata->page_offset,
-				 .rq_npages = rdata->nr_pages,
-				 .rq_pagesz = rdata->pagesz,
-				 .rq_tailsz = rdata->tailsz };
+				 .rq_nvec = 1, };
+
+	if (rdata->got_bytes) {
+		rqst.rq_pages = rdata->pages;
+		rqst.rq_offset = rdata->page_offset;
+		rqst.rq_npages = rdata->nr_pages;
+		rqst.rq_pagesz = rdata->pagesz;
+		rqst.rq_tailsz = rdata->tailsz;
+	}
 
 	WARN_ONCE(rdata->server != mid->server,
 		  "rdata server %p != mid server %p",