From a103af1b64d74853a5e08ca6c86aeb0e5c6ca4f1 Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Mon, 9 Jul 2018 12:21:44 +0300
Subject: [PATCH] mei: don't update offset in write
Git-commit: a103af1b64d74853a5e08ca6c86aeb0e5c6ca4f1
Patch-mainline: v4.19-rc1
References: bsc#1051510

MEI enables writes of complete messages only
while read can be performed in parts, hence
write should not update the file offset to
not break interleaving partial reads with writes.

Cc: <stable@vger.kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/misc/mei/main.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -291,7 +291,6 @@ static ssize_t mei_write(struct file *fi
 		goto out;
 	}
 
-	*offset = 0;
 	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
 	if (!cb) {
 		rets = -ENOMEM;