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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: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Franck Bui-Huu 2006-06-14 10:47:18 +02:00 committed by Greg Kroah-Hartman
parent 943e1b4d60
commit ca094f1186
1 changed files with 8 additions and 10 deletions
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18
drivers/usb/gadget/serial.c
View File

@ -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);
}