From: Andrew Morton <akpm@linux-foundation.org>

If this down_interruptible() does fail due to signal_pending() then the state
of the driver will get trashed in interesting ways, because userspace cannot
and will not retry the close().

Cc: Greg KH <greg@kroah.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/usb/misc/auerswald.c |   10 ++--------
 1 files changed, 2 insertions(+), 8 deletions(-)

diff -puN drivers/usb/misc/auerswald.c~auerswald-fix-file-release-handler drivers/usb/misc/auerswald.c
--- a/drivers/usb/misc/auerswald.c~auerswald-fix-file-release-handler
+++ a/drivers/usb/misc/auerswald.c
@@ -1822,16 +1822,10 @@ static int auerchar_release (struct inod
 	pauerswald_t cp;
 	dbg("release");
 
-	/* get the mutexes */
-	if (down_interruptible (&ccp->mutex)) {
-		return -ERESTARTSYS;
-	}
+	down(&ccp->mutex);
 	cp = ccp->auerdev;
 	if (cp) {
-		if (down_interruptible (&cp->mutex)) {
-			up (&ccp->mutex);
-			return -ERESTARTSYS;
-		}
+		down(&cp->mutex);
 		/* remove an open service */
 		auerswald_removeservice (cp, &ccp->scontext);
 		/* detach from device */
_