commit da191c28f571cae4b470b079394bd4a87e459035
author Dan Carpenter <dan.carpenter@oracle.com> Fri Nov 18 14:30:57 2016 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tue Nov 29 20:25:34 2016 +0100
tree 4eaa9f1d4b5a015a8ebf5861d55405a248df47b9
parent dd5c472a60e43549d789a17a8444513eec64bd7e

snsc: restore IRQs on error path in scdrv_write()

This bug is as old as git.  We need to be calling spin_unlock_irqrestore()
instead of regular spin_unlock() here.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/snsc.c

diff --git a/drivers/char/snsc.c b/drivers/char/snsc.c
index 10e5632..ec07f0e 100644
--- a/drivers/char/snsc.c
+++ b/drivers/char/snsc.c
@@ -285,7 +285,7 @@ scdrv_write(struct file *file, const char __user *buf,
 		DECLARE_WAITQUEUE(wait, current);
 
 		if (file->f_flags & O_NONBLOCK) {
-			spin_unlock(&sd->sd_wlock);
+			spin_unlock_irqrestore(&sd->sd_wlock, flags);
 			up(&sd->sd_wbs);
 			return -EAGAIN;
 		}