diff options
Diffstat (limited to 'drivers/usb/misc/adutux.c')
| -rw-r--r-- | drivers/usb/misc/adutux.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c index 344d523b0502..6f5edb9fc61e 100644 --- a/drivers/usb/misc/adutux.c +++ b/drivers/usb/misc/adutux.c @@ -75,6 +75,7 @@ struct adu_device { char serial_number[8]; int open_count; /* number of times this port has been opened */ + unsigned long disconnected:1; char *read_buffer_primary; int read_buffer_length; @@ -116,7 +117,7 @@ static void adu_abort_transfers(struct adu_device *dev) { unsigned long flags; - if (dev->udev == NULL) + if (dev->disconnected) return; /* shutdown transfer */ @@ -148,6 +149,7 @@ static void adu_delete(struct adu_device *dev) kfree(dev->read_buffer_secondary); kfree(dev->interrupt_in_buffer); kfree(dev->interrupt_out_buffer); + usb_put_dev(dev->udev); kfree(dev); } @@ -243,7 +245,7 @@ static int adu_open(struct inode *inode, struct file *file) } dev = usb_get_intfdata(interface); - if (!dev || !dev->udev) { + if (!dev) { retval = -ENODEV; goto exit_no_device; } @@ -326,7 +328,7 @@ static int adu_release(struct inode *inode, struct file *file) } adu_release_internal(dev); - if (dev->udev == NULL) { + if (dev->disconnected) { /* the device was unplugged before the file was released */ if (!dev->open_count) /* ... and we're the last user */ adu_delete(dev); @@ -354,7 +356,7 @@ static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, return -ERESTARTSYS; /* verify that the device wasn't unplugged */ - if (dev->udev == NULL) { + if (dev->disconnected) { retval = -ENODEV; pr_err("No device or device unplugged %d\n", retval); goto exit; @@ -518,7 +520,7 @@ static ssize_t adu_write(struct file *file, const __user char *buffer, goto exit_nolock; /* verify that the device wasn't unplugged */ - if (dev->udev == NULL) { + if (dev->disconnected) { retval = -ENODEV; pr_err("No device or device unplugged %d\n", retval); goto exit; @@ -663,7 +665,7 @@ static int adu_probe(struct usb_interface *interface, mutex_init(&dev->mtx); spin_lock_init(&dev->buflock); - dev->udev = udev; + dev->udev = usb_get_dev(udev); init_waitqueue_head(&dev->read_wait); init_waitqueue_head(&dev->write_wait); @@ -762,14 +764,18 @@ static void adu_disconnect(struct usb_interface *interface) dev = usb_get_intfdata(interface); - mutex_lock(&dev->mtx); /* not interruptible */ - dev->udev = NULL; /* poison */ usb_deregister_dev(interface, &adu_class); - mutex_unlock(&dev->mtx); + + usb_poison_urb(dev->interrupt_in_urb); + usb_poison_urb(dev->interrupt_out_urb); mutex_lock(&adutux_mutex); usb_set_intfdata(interface, NULL); + mutex_lock(&dev->mtx); /* not interruptible */ + dev->disconnected = 1; + mutex_unlock(&dev->mtx); + /* if the device is not opened, then we clean up right now */ if (!dev->open_count) adu_delete(dev); |