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linux-davinci-2.6.23
Commit 08a2b3b6 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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USB: whiteheat driver update 

this is an update of the whiteheat driver. It fixes:

- switch from spinlocks to mutexes to prevent sleeping with a spinlock held
- locking to stop races with disconnect
- error handling for commands that time out
Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 403dfb58
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Inline Side-by-side
Showing with 52 additions and 40 deletions
drivers/usb/serial/whiteheat.c
View file @ 08a2b3b6
......@@ -74,6 +74,7 @@
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/termbits.h>
#include <linux/usb.h>
......@@ -203,7 +204,7 @@ static struct usb_serial_driver whiteheat_device = {
struct whiteheat_command_private {
spinlock_t lock;
struct mutex mutex;
__u8 port_running;
__u8 command_finished;
wait_queue_head_t wait_command; /* for handling sleeping while waiting for a command to finish */
......@@ -232,6 +233,7 @@ struct whiteheat_private {
struct usb_serial_port *port;
struct list_head tx_urbs_free;
struct list_head tx_urbs_submitted;
struct mutex deathwarrant;
};
......@@ -425,6 +427,7 @@ static int whiteheat_attach (struct usb_serial *serial)
}
spin_lock_init(&info->lock);
mutex_init(&info->deathwarrant);
info->flags = 0;
info->mcr = 0;
INIT_WORK(&info->rx_work, rx_data_softint);
......@@ -495,7 +498,7 @@ static int whiteheat_attach (struct usb_serial *serial)
goto no_command_private;
}
spin_lock_init(&command_info->lock);
mutex_init(&command_info->mutex);
command_info->port_running = 0;
init_waitqueue_head(&command_info->wait_command);
usb_set_serial_port_data(command_port, command_info);
......@@ -654,7 +657,6 @@ static void whiteheat_close(struct usb_serial_port *port, struct file * filp)
struct urb *urb;
struct list_head *tmp;
struct list_head *tmp2;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
......@@ -683,24 +685,32 @@ static void whiteheat_close(struct usb_serial_port *port, struct file * filp)
firm_close(port);
printk(KERN_ERR"Before processing rx_urbs_submitted.\n");
/* shutdown our bulk reads and writes */
spin_lock_irqsave(&info->lock, flags);
mutex_lock(&info->deathwarrant);
spin_lock_irq(&info->lock);
list_for_each_safe(tmp, tmp2, &info->rx_urbs_submitted) {
wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
urb = wrap->urb;
list_del(tmp);
spin_unlock_irq(&info->lock);
usb_kill_urb(urb);
list_move(tmp, &info->rx_urbs_free);
spin_lock_irq(&info->lock);
list_add(tmp, &info->rx_urbs_free);
}
list_for_each_safe(tmp, tmp2, &info->rx_urb_q)
list_move(tmp, &info->rx_urbs_free);
list_for_each_safe(tmp, tmp2, &info->tx_urbs_submitted) {
wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
urb = wrap->urb;
list_del(tmp);
spin_unlock_irq(&info->lock);
usb_kill_urb(urb);
list_move(tmp, &info->tx_urbs_free);
spin_lock_irq(&info->lock);
list_add(tmp, &info->tx_urbs_free);
}
spin_unlock_irqrestore(&info->lock, flags);
spin_unlock_irq(&info->lock);
mutex_unlock(&info->deathwarrant);
stop_command_port(port->serial);
......@@ -872,7 +882,7 @@ static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, un
}
static void whiteheat_set_termios (struct usb_serial_port *port, struct ktermios *old_termios)
static void whiteheat_set_termios(struct usb_serial_port *port, struct ktermios *old_termios)
{
dbg("%s -port %d", __FUNCTION__, port->number);
......@@ -920,7 +930,7 @@ static int whiteheat_chars_in_buffer(struct usb_serial_port *port)
spin_unlock_irqrestore(&info->lock, flags);
dbg ("%s - returns %d", __FUNCTION__, chars);
return (chars);
return chars;
}
......@@ -962,7 +972,7 @@ static void whiteheat_unthrottle (struct usb_serial_port *port)
/*****************************************************************************
* Connect Tech's White Heat callback routines
*****************************************************************************/
static void command_port_write_callback (struct urb *urb)
static void command_port_write_callback(struct urb *urb)
{
dbg("%s", __FUNCTION__);
......@@ -973,43 +983,43 @@ static void command_port_write_callback (struct urb *urb)
}
static void command_port_read_callback (struct urb *urb)
static void command_port_read_callback(struct urb *urb)
{
struct usb_serial_port *command_port = (struct usb_serial_port *)urb->context;
struct whiteheat_command_private *command_info;
unsigned char *data = urb->transfer_buffer;
int result;
unsigned long flags;
dbg("%s", __FUNCTION__);
command_info = usb_get_serial_port_data(command_port);
if (!command_info) {
dbg ("%s - command_info is NULL, exiting.", __FUNCTION__);
return;
}
if (urb->status) {
dbg("%s - nonzero urb status: %d", __FUNCTION__, urb->status);
if (urb->status != -ENOENT)
command_info->command_finished = WHITEHEAT_CMD_FAILURE;
wake_up(&command_info->wait_command);
return;
}
usb_serial_debug_data(debug, &command_port->dev, __FUNCTION__, urb->actual_length, data);
command_info = usb_get_serial_port_data(command_port);
if (!command_info) {
dbg ("%s - command_info is NULL, exiting.", __FUNCTION__);
return;
}
spin_lock_irqsave(&command_info->lock, flags);
if (data[0] == WHITEHEAT_CMD_COMPLETE) {
command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
wake_up_interruptible(&command_info->wait_command);
wake_up(&command_info->wait_command);
} else if (data[0] == WHITEHEAT_CMD_FAILURE) {
command_info->command_finished = WHITEHEAT_CMD_FAILURE;
wake_up_interruptible(&command_info->wait_command);
wake_up(&command_info->wait_command);
} else if (data[0] == WHITEHEAT_EVENT) {
/* These are unsolicited reports from the firmware, hence no waiting command to wakeup */
dbg("%s - event received", __FUNCTION__);
} else if (data[0] == WHITEHEAT_GET_DTR_RTS) {
memcpy(command_info->result_buffer, &data[1], urb->actual_length - 1);
command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
wake_up_interruptible(&command_info->wait_command);
wake_up(&command_info->wait_command);
} else {
dbg("%s - bad reply from firmware", __FUNCTION__);
}
......@@ -1017,7 +1027,6 @@ static void command_port_read_callback (struct urb *urb)
/* Continue trying to always read */
command_port->read_urb->dev = command_port->serial->dev;
result = usb_submit_urb(command_port->read_urb, GFP_ATOMIC);
spin_unlock_irqrestore(&command_info->lock, flags);
if (result)
dbg("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
}
......@@ -1095,20 +1104,20 @@ static void whiteheat_write_callback(struct urb *urb)
/*****************************************************************************
* Connect Tech's White Heat firmware interface
*****************************************************************************/
static int firm_send_command (struct usb_serial_port *port, __u8 command, __u8 *data, __u8 datasize)
static int firm_send_command(struct usb_serial_port *port, __u8 command, __u8 *data, __u8 datasize)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
struct whiteheat_private *info;
__u8 *transfer_buffer;
int retval = 0;
unsigned long flags;
int t;
dbg("%s - command %d", __FUNCTION__, command);
command_port = port->serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
spin_lock_irqsave(&command_info->lock, flags);
mutex_lock(&command_info->mutex);
command_info->command_finished = false;
transfer_buffer = (__u8 *)command_port->write_urb->transfer_buffer;
......@@ -1116,18 +1125,17 @@ static int firm_send_command (struct usb_serial_port *port, __u8 command, __u8 *
memcpy (&transfer_buffer[1], data, datasize);
command_port->write_urb->transfer_buffer_length = datasize + 1;
command_port->write_urb->dev = port->serial->dev;
retval = usb_submit_urb (command_port->write_urb, GFP_KERNEL);
retval = usb_submit_urb (command_port->write_urb, GFP_NOIO);
if (retval) {
dbg("%s - submit urb failed", __FUNCTION__);
goto exit;
}
spin_unlock_irqrestore(&command_info->lock, flags);
/* wait for the command to complete */
wait_event_interruptible_timeout(command_info->wait_command,
t = wait_event_timeout(command_info->wait_command,
(bool)command_info->command_finished, COMMAND_TIMEOUT);
spin_lock_irqsave(&command_info->lock, flags);
if (!t)
usb_kill_urb(command_port->write_urb);
if (command_info->command_finished == false) {
dbg("%s - command timed out.", __FUNCTION__);
......@@ -1152,7 +1160,7 @@ static int firm_send_command (struct usb_serial_port *port, __u8 command, __u8 *
}
exit:
spin_unlock_irqrestore(&command_info->lock, flags);
mutex_unlock(&command_info->mutex);
return retval;
}
......@@ -1305,12 +1313,11 @@ static int start_command_port(struct usb_serial *serial)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
unsigned long flags;
int retval = 0;
command_port = serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
spin_lock_irqsave(&command_info->lock, flags);
mutex_lock(&command_info->mutex);
if (!command_info->port_running) {
/* Work around HCD bugs */
usb_clear_halt(serial->dev, command_port->read_urb->pipe);
......@@ -1325,7 +1332,7 @@ static int start_command_port(struct usb_serial *serial)
command_info->port_running++;
exit:
spin_unlock_irqrestore(&command_info->lock, flags);
mutex_unlock(&command_info->mutex);
return retval;
}
......@@ -1334,15 +1341,14 @@ static void stop_command_port(struct usb_serial *serial)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
unsigned long flags;
command_port = serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
spin_lock_irqsave(&command_info->lock, flags);
mutex_lock(&command_info->mutex);
command_info->port_running--;
if (!command_info->port_running)
usb_kill_urb(command_port->read_urb);
spin_unlock_irqrestore(&command_info->lock, flags);
mutex_unlock(&command_info->mutex);
}
......@@ -1363,17 +1369,23 @@ static int start_port_read(struct usb_serial_port *port)
wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
urb = wrap->urb;
urb->dev = port->serial->dev;
spin_unlock_irqrestore(&info->lock, flags);
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
spin_lock_irqsave(&info->lock, flags);
list_add(tmp, &info->rx_urbs_free);
list_for_each_safe(tmp, tmp2, &info->rx_urbs_submitted) {
wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
urb = wrap->urb;
list_del(tmp);
spin_unlock_irqrestore(&info->lock, flags);
usb_kill_urb(urb);
list_move(tmp, &info->rx_urbs_free);
spin_lock_irqsave(&info->lock, flags);
list_add(tmp, &info->rx_urbs_free);
}
break;
}
spin_lock_irqsave(&info->lock, flags);
list_add(tmp, &info->rx_urbs_submitted);
}
......
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