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Date: Thu, 12 May 2016 10:48:51 +0200
From: Mathieu OTHACEHE <m.othacehe@...il.com>
To: johan@...nel.org
Cc: gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mathieu OTHACEHE <m.othacehe@...il.com>
Subject: [PATCH 19/36] usb: serial: ti_usb_3410_5052: Do not modify interrupt context
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@...il.com>
---
drivers/usb/serial/ti_usb_3410_5052.c | 55 +++++++++++++++--------------------
1 file changed, 24 insertions(+), 31 deletions(-)
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 9654fa3..48f9253 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -311,7 +311,7 @@ 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 int ti_download_firmware(struct ti_device *tdev);
static const struct usb_device_id ti_id_table_3410[] = {
@@ -711,7 +711,6 @@ 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);
@@ -1081,17 +1080,12 @@ static void ti_break(struct tty_struct *tty, int break_state)
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) {
@@ -1100,63 +1094,61 @@ 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];
- ti_handle_new_msr(tport, 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);
}
static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
@@ -1263,12 +1255,13 @@ 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);
@@ -1281,7 +1274,7 @@ 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);
}
--
2.8.2
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