[PATCH] CIFS: return correct errors when pinning memory failed for direct I/O

[Long Li]

From: Long Li <lon...@microsoft.com>

When pinning memory failed, we should return the correct error code and
rewind the SMB credits.

Reported-by: Murphy Zhou <jencce.ker...@gmail.com>
Signed-off-by: Long Li <lon...@microsoft.com>
Cc: sta...@vger.kernel.org
Cc: Murphy Zhou <jencce.ker...@gmail.com>
---
 fs/cifs/file.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index c9bc56b..3467351 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2630,6 +2630,9 @@ cifs_write_from_iter(loff_t offset, size_t len, struct 
iov_iter *from,
                                        result, from->type,
                                        from->iov_offset, from->count);
                                dump_stack();
+
+                               rc = result;
+                               add_credits_and_wake_if(server, credits, 0);
                                break;
                        }
                        cur_len = (size_t)result;
@@ -3313,13 +3316,16 @@ cifs_send_async_read(loff_t offset, size_t len, struct 
cifsFileInfo *open_file,
                                        cur_len, &start);
                        if (result < 0) {
                                cifs_dbg(VFS,
-                                       "couldn't get user pages (cur_len=%zd)"
+                                       "couldn't get user pages (rc=%zd)"
                                        " iter type %d"
                                        " iov_offset %zd count %zd\n",
                                        result, direct_iov.type,
                                        direct_iov.iov_offset,
                                        direct_iov.count);
                                dump_stack();
+
+                               rc = result;
+                               add_credits_and_wake_if(server, credits, 0);
                                break;
                        }
                        cur_len = (size_t)result;
-- 
2.7.4