linux-kernel - [patch] snsc: restore IRQs on error path in scdrv

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Date:   Fri, 18 Nov 2016 14:30:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] 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@...cle.com>

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;
 		}