From 943e1b4d60dc7acfabe2ebad31189bcb3b853688 Mon Sep 17 00:00:00 2001
From: Franck Bui-Huu <vagabon.xyz@gmail.com>
Date: Wed, 14 Jun 2006 10:29:21 +0200
Subject: [PATCH] [PATCH] USB: gadget-serial: fix a deadlock when closing the
 serial device

When closing the device, the driver acquires/release twice the
port lock before/after waiting for the data to be completely
sent. Therefore it will dead lock.

This patch fixes it and also uses the generic scheduler services
for waiting for an event.

Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/usb/gadget/serial.c | 95 +++++++------------------------------
 1 file changed, 17 insertions(+), 78 deletions(-)

diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index b992546c394..b58f015554b 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -51,82 +51,10 @@
 #include "gadget_chips.h"
 
 
-/* Wait Cond */
-
-#define __wait_cond_interruptible(wq, condition, lock, flags, ret)	\
-do {									\
-	wait_queue_t __wait;						\
-	init_waitqueue_entry(&__wait, current);				\
-									\
-	add_wait_queue(&wq, &__wait);					\
-	for (;;) {							\
-		set_current_state(TASK_INTERRUPTIBLE);			\
-		if (condition)						\
-			break;						\
-		if (!signal_pending(current)) {				\
-			spin_unlock_irqrestore(lock, flags);		\
-			schedule();					\
-			spin_lock_irqsave(lock, flags);			\
-			continue;					\
-		}							\
-		ret = -ERESTARTSYS;					\
-		break;							\
-	}								\
-	current->state = TASK_RUNNING;					\
-	remove_wait_queue(&wq, &__wait);				\
-} while (0)
-	
-#define wait_cond_interruptible(wq, condition, lock, flags)		\
-({									\
-	int __ret = 0;							\
-	if (!(condition))						\
-		__wait_cond_interruptible(wq, condition, lock, flags,	\
-						__ret);			\
-	__ret;								\
-})
-
-#define __wait_cond_interruptible_timeout(wq, condition, lock, flags, 	\
-						timeout, ret)		\
-do {									\
-	signed long __timeout = timeout;				\
-	wait_queue_t __wait;						\
-	init_waitqueue_entry(&__wait, current);				\
-									\
-	add_wait_queue(&wq, &__wait);					\
-	for (;;) {							\
-		set_current_state(TASK_INTERRUPTIBLE);			\
-		if (__timeout == 0)					\
-			break;						\
-		if (condition)						\
-			break;						\
-		if (!signal_pending(current)) {				\
-			spin_unlock_irqrestore(lock, flags);		\
-			__timeout = schedule_timeout(__timeout);	\
-			spin_lock_irqsave(lock, flags);			\
-			continue;					\
-		}							\
-		ret = -ERESTARTSYS;					\
-		break;							\
-	}								\
-	current->state = TASK_RUNNING;					\
-	remove_wait_queue(&wq, &__wait);				\
-} while (0)
-	
-#define wait_cond_interruptible_timeout(wq, condition, lock, flags,	\
-						timeout)		\
-({									\
-	int __ret = 0;							\
-	if (!(condition))						\
-		__wait_cond_interruptible_timeout(wq, condition, lock,	\
-						flags, timeout, __ret);	\
-	__ret;								\
-})
-
-
 /* Defines */
 
-#define GS_VERSION_STR			"v2.0"
-#define GS_VERSION_NUM			0x0200
+#define GS_VERSION_STR			"v2.1"
+#define GS_VERSION_NUM			0x0201
 
 #define GS_LONG_NAME			"Gadget Serial"
 #define GS_SHORT_NAME			"g_serial"
@@ -843,6 +771,18 @@ exit_unlock_dev:
 /*
  * gs_close
  */
+
+#define GS_WRITE_FINISHED_EVENT_SAFELY(p)			\
+({								\
+	unsigned long flags;					\
+	int cond;						\
+								\
+	spin_lock_irqsave(&(p)->port_lock, flags);		\
+	cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \
+	spin_unlock_irqrestore(&(p)->port_lock, flags);		\
+	cond;							\
+})
+
 static void gs_close(struct tty_struct *tty, struct file *file)
 {
 	unsigned long flags;
@@ -888,10 +828,9 @@ static void gs_close(struct tty_struct *tty, struct file *file)
 	/* at most GS_CLOSE_TIMEOUT seconds */
 	if (gs_buf_data_avail(port->port_write_buf) > 0) {
 		spin_unlock_irqrestore(&port->port_lock, flags);
-		wait_cond_interruptible_timeout(port->port_write_wait,
-		port->port_dev == NULL
-		|| gs_buf_data_avail(port->port_write_buf) == 0,
-		&port->port_lock, flags, GS_CLOSE_TIMEOUT * HZ);
+		wait_event_interruptible_timeout(port->port_write_wait,
+					GS_WRITE_FINISHED_EVENT_SAFELY(port),
+					GS_CLOSE_TIMEOUT * HZ);
 		spin_lock_irqsave(&port->port_lock, flags);
 	}
 
-- 
2.41.1