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Date: Fri, 24 Jul 2009 14:06:16 -0300
From: Trevor Pace <trevorpace@...il.com>
To: Sergei Shtylyov <sshtylyov@...mvista.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Removed useless retval variables in usb-serial.c
Hey,
My university email account apparently doesn't like maintaining my
formatting, so I'm gonna resend this from my gmail.
Parenthesis may not be needed for that return check but I find it
makes it easier to tell that you are doing. Otherwise someone might
think you are returning serial->type->resume because it has been
broken onto different lines. I checked over the
Documentation/CodingStyle file and found no conflicts with that sort
of notation.
Trevor Pace
Lets try this again:
********************************************************************
Removed useless return value variables.
Signed-off By: Trevor Pace <trevor.pace@....ca>
================================================================================
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index bd7581b..faec1d1 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -362,10 +362,9 @@ static int serial_write(struct tty_struct *tty,
const unsigned char *buf,
int count)
{
struct usb_serial_port *port = tty->driver_data;
- int retval = -ENODEV;
if (port->serial->dev->state == USB_STATE_NOTATTACHED)
- goto exit;
+ return -ENODEV;
dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
@@ -374,10 +373,7 @@ static int serial_write(struct tty_struct *tty,
const unsigned char *buf,
WARN_ON(!port->port.count);
/* pass on to the driver specific version of this function */
- retval = port->serial->type->write(tty, port, buf, count);
-
-exit:
- return retval;
+ return port->serial->type->write(tty, port, buf, count);
}
static int serial_write_room(struct tty_struct *tty)
@@ -429,7 +425,6 @@ static int serial_ioctl(struct tty_struct *tty,
struct file *file,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
- int retval = -ENODEV;
dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
@@ -437,11 +432,9 @@ static int serial_ioctl(struct tty_struct *tty,
struct file *file,
/* pass on to the driver specific version of this function
if it is available */
- if (port->serial->type->ioctl) {
- retval = port->serial->type->ioctl(tty, file, cmd, arg);
- } else
- retval = -ENOIOCTLCMD;
- return retval;
+ if (port->serial->type->ioctl)
+ return port->serial->type->ioctl(tty, file, cmd, arg);
+ return -ENOIOCTLCMD;
}
static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
@@ -1174,7 +1167,7 @@ int usb_serial_suspend(struct usb_interface
*intf, pm_message_t message)
{
struct usb_serial *serial = usb_get_intfdata(intf);
struct usb_serial_port *port;
- int i, r = 0;
+ int i;
serial->suspending = 1;
@@ -1185,24 +1178,21 @@ int usb_serial_suspend(struct usb_interface
*intf, pm_message_t message)
}
if (serial->type->suspend)
- r = serial->type->suspend(serial, message);
+ return serial->type->suspend(serial, message);
- return r;
+ return 0;
}
EXPORT_SYMBOL(usb_serial_suspend);
int usb_serial_resume(struct usb_interface *intf)
{
struct usb_serial *serial = usb_get_intfdata(intf);
- int rv;
serial->suspending = 0;
- if (serial->type->resume)
- rv = serial->type->resume(serial);
- else
- rv = usb_serial_generic_resume(serial);
- return rv;
+ return (serial->type->resume)
+ ? serial->type->resume(serial)
+ : usb_serial_generic_resume(serial);
}
EXPORT_SYMBOL(usb_serial_resume);
******************************************************************
On Fri, Jul 24, 2009 at 1:29 PM, Sergei Shtylyov<sshtylyov@...mvista.com> wrote:
> Hello.
>
> Trevor Pace wrote:
>
>> Removed useless return value variables.
>
> Are you sure gcc doesn't optimize them away? :-)
>
>> Signed-off By: Trevor Pace <trevor.pace@....ca>
>
>>
>> ================================================================================
>
>> diff --git a/drivers/usb/serial/usb-serial.c
>> b/drivers/usb/serial/usb-serial.c
>> index bd7581b..faec1d1 100644
>> --- a/drivers/usb/serial/usb-serial.c
>> +++ b/drivers/usb/serial/usb-serial.c
>
> [...]
>
>> @@ -437,11 +432,9 @@ static int serial_ioctl(struct tty_struct *tty,
>> struct file
>> *file,
>>
>> /* pass on to the driver specific version of this function
>> if it is available */
>> - if (port->serial->type->ioctl) {
>> - retval = port->serial->type->ioctl(tty, file, cmd, arg);
>> - } else
>> - retval = -ENOIOCTLCMD;
>> - return retval;
>> + if (port->serial->type->ioctl)
>> + return port->serial->type->ioctl(tty, file, cmd, arg);
>> + return -ENOIOCTLCMD;
>
> Spaces instead of tab here...
>
>> @@ -1185,24 +1178,21 @@ int usb_serial_suspend(struct usb_interface *intf,
>> pm_message_t message)
>> }
>>
>> if (serial->type->suspend)
>> - r = serial->type->suspend(serial, message);
>> + return serial->type->suspend(serial, message);
>>
>> - return r;
>> + return 0;
>> }
>> EXPORT_SYMBOL(usb_serial_suspend);
>>
>> int usb_serial_resume(struct usb_interface *intf)
>> {
>> struct usb_serial *serial = usb_get_intfdata(intf);
>> - int rv;
>>
>> serial->suspending = 0;
>> - if (serial->type->resume)
>> - rv = serial->type->resume(serial);
>> - else
>> - rv = usb_serial_generic_resume(serial);
>>
>> - return rv;
>> + return (serial->type->resume)
>
> Parens totally not needed here.
>
>> + ? serial->type->resume(serial)
>> + : usb_serial_generic_resume(serial);
>> }
>> EXPORT_SYMBOL(usb_serial_resume);
>
> WBR, Sergei
> --
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