Admitting that there can be only one device allows us
to drop any pretense about locking one device or
a table of devices.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
---
drivers/usb/misc/rio500.c | 43 ++++++++++++++++---------------------------
1 file changed, 16 insertions(+), 27 deletions(-)
diff --git a/drivers/usb/misc/rio500.c b/drivers/usb/misc/rio500.c
index 20c3eb0af7ad..5110eaeda8b4 100644
--- a/drivers/usb/misc/rio500.c
+++ b/drivers/usb/misc/rio500.c
@@ -51,7 +51,6 @@ struct rio_usb_data {
char *obuf, *ibuf; /* transfer buffers */
char bulk_in_ep, bulk_out_ep; /* Endpoint assignments */
wait_queue_head_t wait_q; /* for timeouts */
- struct mutex lock; /* general race avoidance */
};
static DEFINE_MUTEX(rio500_mutex);
@@ -63,10 +62,8 @@ static int open_rio(struct inode *inode, struct file *file)
/* against disconnect() */
mutex_lock(&rio500_mutex);
- mutex_lock(&(rio->lock));
if (rio->isopen || !rio->present) {
- mutex_unlock(&(rio->lock));
mutex_unlock(&rio500_mutex);
return -EBUSY;
}
@@ -74,7 +71,6 @@ static int open_rio(struct inode *inode, struct file *file)
init_waitqueue_head(&rio->wait_q);
- mutex_unlock(&(rio->lock));
dev_info(&rio->rio_dev->dev, "Rio opened.\n");
mutex_unlock(&rio500_mutex);
@@ -88,7 +84,6 @@ static int close_rio(struct inode *inode, struct file *file)
/* against disconnect() */
mutex_lock(&rio500_mutex);
- mutex_lock(&(rio->lock));
rio->isopen = 0;
if (!rio->present) {
@@ -100,7 +95,6 @@ static int close_rio(struct inode *inode, struct file *file)
} else {
dev_info(&rio->rio_dev->dev, "Rio closed.\n");
}
- mutex_unlock(&(rio->lock));
mutex_unlock(&rio500_mutex);
return 0;
}
@@ -115,7 +109,7 @@ static long ioctl_rio(struct file *file, unsigned int cmd, unsigned long arg)
int retries;
int retval=0;
- mutex_lock(&(rio->lock));
+ mutex_lock(&rio500_mutex);
/* Sanity check to make sure rio is connected, powered, etc */
if (rio->present == 0 || rio->rio_dev == NULL) {
retval = -ENODEV;
@@ -259,7 +253,7 @@ static long ioctl_rio(struct file *file, unsigned int cmd, unsigned long arg)
err_out:
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return retval;
}
@@ -279,12 +273,12 @@ write_rio(struct file *file, const char __user *buffer,
int errn = 0;
int intr;
- intr = mutex_lock_interruptible(&(rio->lock));
+ intr = mutex_lock_interruptible(&rio500_mutex);
if (intr)
return -EINTR;
/* Sanity check to make sure rio is connected, powered, etc */
if (rio->present == 0 || rio->rio_dev == NULL) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return -ENODEV;
}
@@ -307,7 +301,7 @@ write_rio(struct file *file, const char __user *buffer,
goto error;
}
if (signal_pending(current)) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return bytes_written ? bytes_written : -EINTR;
}
@@ -345,12 +339,12 @@ write_rio(struct file *file, const char __user *buffer,
buffer += copy_size;
} while (count > 0);
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return bytes_written ? bytes_written : -EIO;
error:
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return errn;
}
@@ -367,12 +361,12 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
char *ibuf;
int intr;
- intr = mutex_lock_interruptible(&(rio->lock));
+ intr = mutex_lock_interruptible(&rio500_mutex);
if (intr)
return -EINTR;
/* Sanity check to make sure rio is connected, powered, etc */
if (rio->present == 0 || rio->rio_dev == NULL) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return -ENODEV;
}
@@ -383,11 +377,11 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
while (count > 0) {
if (signal_pending(current)) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return read_count ? read_count : -EINTR;
}
if (!rio->rio_dev) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return -ENODEV;
}
this_read = (count >= IBUF_SIZE) ? IBUF_SIZE : count;
@@ -405,7 +399,7 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
count = this_read = partial;
} else if (result == -ETIMEDOUT || result == 15) { /* FIXME: 15 ??? */
if (!maxretry--) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
dev_err(&rio->rio_dev->dev,
"read_rio: maxretry timeout\n");
return -ETIME;
@@ -415,19 +409,19 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
finish_wait(&rio->wait_q, &wait);
continue;
} else if (result != -EREMOTEIO) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
dev_err(&rio->rio_dev->dev,
"Read Whoops - result:%d partial:%u this_read:%u\n",
result, partial, this_read);
return -EIO;
} else {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return (0);
}
if (this_read) {
if (copy_to_user(buffer, ibuf, this_read)) {
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return -EFAULT;
}
count -= this_read;
@@ -435,7 +429,7 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
buffer += this_read;
}
}
- mutex_unlock(&(rio->lock));
+ mutex_unlock(&rio500_mutex);
return read_count;
}
@@ -495,8 +489,6 @@ static int probe_rio(struct usb_interface *intf,
}
dev_dbg(&intf->dev, "ibuf address:%p\n", rio->ibuf);
- mutex_init(&(rio->lock));
-
usb_set_intfdata (intf, rio);
rio->present = 1;
@@ -512,12 +504,10 @@ static void disconnect_rio(struct usb_interface *intf)
if (rio) {
usb_deregister_dev(intf, &usb_rio_class);
- mutex_lock(&(rio->lock));
if (rio->isopen) {
rio->isopen = 0;
/* better let it finish - the release will do whats needed */
rio->rio_dev = NULL;
- mutex_unlock(&(rio->lock));
mutex_unlock(&rio500_mutex);
return;
}
@@ -529,7 +519,6 @@ static void disconnect_rio(struct usb_interface *intf)
dev_info(&intf->dev, "USB Rio disconnected.\n");
rio->present = 0;
- mutex_unlock(&(rio->lock));
}
mutex_unlock(&rio500_mutex);
}
--
2.16.4
