[PATCH v2 11/22] usb: serial: ti_usb_3410_5052: Do not modify interrupt context

Mathieu OTHACEHE
2016-07-26T18:07:06Z

It is useless to pass a specific context (ti_device) to the interrupt
callback. So use the default context (usb_serial_port).

Remove useless variables in ti_interrupt_callback.

Signed-off-by: Mathieu OTHACEHE <m.othacehe@gmail.com>
---
drivers/usb/serial/ti_usb_3410_5052.c | 58 ++++++++++++++++-------------------
1 file changed, 26 insertions(+), 32 deletions(-)

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 7f53432..ee8f08c 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -343,7 +343,7 @@ static int ti_get_serial_info(struct ti_port *tport,
struct serial_struct __user *ret_arg);
static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
struct serial_struct __user *new_arg);
-static void ti_handle_new_msr(struct ti_port *tport, u8 msr);
+static void ti_handle_new_msr(struct usb_serial_port *port, u8 msr);

static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);
@@ -735,7 +735,6 @@ static int ti_open(struct tty_struct *tty, struct usb_serial_port *port)
status = -EINVAL;
goto release_lock;
}
- urb->context = tdev;
status = usb_submit_urb(urb, GFP_KERNEL);
if (status) {
dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __func__, status);
@@ -1204,17 +1203,12 @@ static int ti_get_func_from_code(unsigned char code)

static void ti_interrupt_callback(struct urb *urb)
{
- struct ti_device *tdev = urb->context;
- struct usb_serial_port *port;
- struct usb_serial *serial = tdev->td_serial;
- struct ti_port *tport;
- struct device *dev = &urb->dev->dev;
+ struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
int length = urb->actual_length;
int port_number;
int function;
int status = urb->status;
- int retval;
u8 msr;

switch (status) {
@@ -1223,64 +1217,63 @@ static void ti_interrupt_callback(struct urb *urb)
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
- dev_dbg(dev, "%s - urb shutting down, %d\n", __func__, status);
+ dev_dbg(&port->dev, "%s - urb shutting down, %d\n",
+ __func__, status);
return;
default:
- dev_err(dev, "%s - nonzero urb status, %d\n", __func__, status);
+ dev_err(&port->dev, "%s - nonzero urb status, %d\n",
+ __func__, status);
goto exit;
}

if (length != 2) {
- dev_dbg(dev, "%s - bad packet size, %d\n", __func__, length);
+ dev_dbg(&port->dev, "%s - bad packet size, %d\n",
+ __func__, length);
goto exit;
}

if (data[0] == TI_CODE_HARDWARE_ERROR) {
- dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
+ dev_err(&port->dev, "%s - hardware error, %d\n",
+ __func__, data[1]);
goto exit;
}

port_number = ti_get_port_from_code(data[0]);
function = ti_get_func_from_code(data[0]);

- dev_dbg(dev, "%s - port_number %d, function %d, data 0x%02X\n",
+ dev_dbg(&port->dev, "%s - port_number %d, function %d, data 0x%02X\n",
__func__, port_number, function, data[1]);

- if (port_number >= serial->num_ports) {
- dev_err(dev, "%s - bad port number, %d\n",
+ if (port_number >= port->serial->num_ports) {
+ dev_err(&port->dev, "%s - bad port number, %d\n",
__func__, port_number);
goto exit;
}

- port = serial->port[port_number];
-
- tport = usb_get_serial_port_data(port);
- if (!tport)
- goto exit;
-
switch (function) {
case TI_CODE_DATA_ERROR:
- dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
+ dev_err(&port->dev, "%s - DATA ERROR, port %d, data 0x%02X\n",
__func__, port_number, data[1]);
break;

case TI_CODE_MODEM_STATUS:
msr = data[1];
- dev_dbg(dev, "%s - port %d, msr 0x%02X\n", __func__, port_number, msr);
- ti_handle_new_msr(tport, msr);
+ dev_dbg(&port->dev, "%s - port %d, msr 0x%02X\n",
+ __func__, port_number, msr);
+ ti_handle_new_msr(port, msr);
break;

default:
- dev_err(dev, "%s - unknown interrupt code, 0x%02X\n",
+ dev_err(&port->dev, "%s - unknown interrupt code, 0x%02X\n",
__func__, data[1]);
break;
}

exit:
- retval = usb_submit_urb(urb, GFP_ATOMIC);
- if (retval)
- dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
- __func__, retval);
+ status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (status)
+ dev_err(&port->dev, "%s - resubmit interrupt urb failed, %d\n",
+ __func__, status);
}

@@ -1545,12 +1538,13 @@ static int ti_set_serial_info(struct tty_struct *tty, struct ti_port *tport,
}

-static void ti_handle_new_msr(struct ti_port *tport, u8 msr)
+static void ti_handle_new_msr(struct usb_serial_port *port, u8 msr)
{
+ struct ti_port *tport = usb_get_serial_port_data(port);
struct async_icount *icount;
unsigned long flags;

- dev_dbg(&tport->tp_port->dev, "%s - msr 0x%02X\n", __func__, msr);
+ dev_dbg(&port->dev, "%s - msr 0x%02X\n", __func__, msr);

if (msr & TI_MSR_DELTA_MASK) {
spin_lock_irqsave(&tport->tp_lock, flags);
@@ -1563,7 +1557,7 @@ static void ti_handle_new_msr(struct ti_port *tport, u8 msr)
icount->dcd++;
if (msr & TI_MSR_DELTA_RI)
icount->rng++;
- wake_up_interruptible(&tport->tp_port->port.delta_msr_wait);
+ wake_up_interruptible(&port->port.delta_msr_wait);
spin_unlock_irqrestore(&tport->tp_lock, flags);
}

--
2.9.0