From: Federico Vaga <federico.vaga@gmail.com>
Date: Sat, 29 Oct 2011 07:47:39 +0000 (+0200)
Subject: Staging: comedi: fix signal handling in read and write
X-Git-Tag: firefly_0821_release~7541^2~2169
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=56448baac0c3d52501dc26868e15caba1811866d;p=firefly-linux-kernel-4.4.55.git

Staging: comedi: fix signal handling in read and write

commit 6a9ce6b654e491981f6ef7e214cbd4f63e033848 upstream.

After sleeping on a wait queue, signal_pending(current) should be
checked (not before sleeping).

Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 69bd6f01bf6b..63e50f761828 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1673,11 +1673,11 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
 				retval = -EAGAIN;
 				break;
 			}
+			schedule();
 			if (signal_pending(current)) {
 				retval = -ERESTARTSYS;
 				break;
 			}
-			schedule();
 			if (!s->busy)
 				break;
 			if (s->busy != file) {
@@ -1780,11 +1780,11 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
 				retval = -EAGAIN;
 				break;
 			}
+			schedule();
 			if (signal_pending(current)) {
 				retval = -ERESTARTSYS;
 				break;
 			}
-			schedule();
 			if (!s->busy) {
 				retval = 0;
 				break;