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Commit ca094f11 authored by Franck Bui-Huu's avatar Franck Bui-Huu Committed by Greg Kroah-Hartman
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[PATCH] USB: gadget-serial: do not save/restore IRQ flags in gs_close() 



As pointed out by David Brownell, we know that IRQs are never
blocked when calling gs_close function. So the save/restore
IRQ flags are pointless.

Signed-off-by: default avatarFranck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 943e1b4d

drivers/usb/gadget/serial.c

+8 −10
Original line number Diff line number Diff line
@@ -53,8 +53,8 @@ 


/* Defines */



#define GS_VERSION_STR			"v2.1"

#define GS_VERSION_NUM			0x0201

#define GS_VERSION_STR			"v2.2"

#define GS_VERSION_NUM			0x0202



#define GS_LONG_NAME			"Gadget Serial"

#define GS_SHORT_NAME			"g_serial"
@@ -774,18 +774,16 @@ static int gs_open(struct tty_struct *tty, struct file *file) 


#define GS_WRITE_FINISHED_EVENT_SAFELY(p)			\

({								\

	unsigned long flags;					\

	int cond;						\

								\

	spin_lock_irqsave(&(p)->port_lock, flags);		\

	spin_lock_irq(&(p)->port_lock);				\

	cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \

	spin_unlock_irqrestore(&(p)->port_lock, flags);		\

	spin_unlock_irq(&(p)->port_lock);			\

	cond;							\

})



static void gs_close(struct tty_struct *tty, struct file *file)

{

	unsigned long flags;

	struct gs_port *port = tty->driver_data;

	struct semaphore *sem;
@@ -799,7 +797,7 @@ static void gs_close(struct tty_struct *tty, struct file *file) 
	sem = &gs_open_close_sem[port->port_num];

	down(sem);



	spin_lock_irqsave(&port->port_lock, flags);

	spin_lock_irq(&port->port_lock);



	if (port->port_open_count == 0) {

		printk(KERN_ERR
@@ -827,11 +825,11 @@ static void gs_close(struct tty_struct *tty, struct file *file) 
	/* wait for write buffer to drain, or */

	/* at most GS_CLOSE_TIMEOUT seconds */

	if (gs_buf_data_avail(port->port_write_buf) > 0) {

		spin_unlock_irqrestore(&port->port_lock, flags);

		spin_unlock_irq(&port->port_lock);

		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);

		spin_lock_irq(&port->port_lock);

	}



	/* free disconnected port on final close */
@@ -851,7 +849,7 @@ static void gs_close(struct tty_struct *tty, struct file *file) 
		port->port_num, tty, file);



exit:

	spin_unlock_irqrestore(&port->port_lock, flags);

	spin_unlock_irq(&port->port_lock);

	up(sem);

}