From 0f2f02d1b57220951b9ae69abbcaa403163ee41b Mon Sep 17 00:00:00 2001
From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: Sun, 25 Jun 2017 10:47:24 +0300
Subject: [PATCH] staging: ccree: use signal safe completion wait
Git-commit: 0f2f02d1b57220951b9ae69abbcaa403163ee41b
References: git-fixes
Patch-mainline: v4.13

We were waiting for a completion notification of HW DMA
operation using an interruptible wait which can result
in data corruption if a signal interrupted us while
DMA was not yet completed.

Fix this by moving to uninterrupted wait.

Fixes: abefd6741d ("staging: ccree: introduce CryptoCell HW driver").

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/staging/ccree/ssi_request_mgr.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/ccree/ssi_request_mgr.c
+++ b/drivers/staging/ccree/ssi_request_mgr.c
@@ -482,7 +482,8 @@ int send_request(
 	if (!is_dout) {
 		/* Wait upon sequence completion.
 		*  Return "0" -Operation done successfully. */
-		return wait_for_completion_interruptible(&ssi_req->seq_compl);
+		wait_for_completion(&ssi_req->seq_compl);
+		return 0;
 	} else {
 		/* Operation still in process */
 		return -EINPROGRESS;