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path: root/drivers/usb/misc/ldusb.c
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Diffstat (limited to 'drivers/usb/misc/ldusb.c')
-rw-r--r--drivers/usb/misc/ldusb.c50
1 files changed, 27 insertions, 23 deletions
diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index c5e3032a4d6b..0f0cdb7b7bf8 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -158,6 +158,7 @@ MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in
struct ld_usb {
struct mutex mutex; /* locks this structure */
struct usb_interface* intf; /* save off the usb interface pointer */
+ unsigned long disconnected:1;
int open_count; /* number of times this port has been opened */
@@ -197,12 +198,10 @@ static void ld_usb_abort_transfers(struct ld_usb *dev)
/* shutdown transfer */
if (dev->interrupt_in_running) {
dev->interrupt_in_running = 0;
- if (dev->intf)
- usb_kill_urb(dev->interrupt_in_urb);
+ usb_kill_urb(dev->interrupt_in_urb);
}
if (dev->interrupt_out_busy)
- if (dev->intf)
- usb_kill_urb(dev->interrupt_out_urb);
+ usb_kill_urb(dev->interrupt_out_urb);
}
/**
@@ -210,8 +209,6 @@ static void ld_usb_abort_transfers(struct ld_usb *dev)
*/
static void ld_usb_delete(struct ld_usb *dev)
{
- ld_usb_abort_transfers(dev);
-
/* free data structures */
usb_free_urb(dev->interrupt_in_urb);
usb_free_urb(dev->interrupt_out_urb);
@@ -267,7 +264,7 @@ static void ld_usb_interrupt_in_callback(struct urb *urb)
resubmit:
/* resubmit if we're still running */
- if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) {
+ if (dev->interrupt_in_running && !dev->buffer_overflow) {
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
if (retval) {
dev_err(&dev->intf->dev,
@@ -387,16 +384,13 @@ static int ld_usb_release(struct inode *inode, struct file *file)
goto exit;
}
- if (mutex_lock_interruptible(&dev->mutex)) {
- retval = -ERESTARTSYS;
- goto exit;
- }
+ mutex_lock(&dev->mutex);
if (dev->open_count != 1) {
retval = -ENODEV;
goto unlock_exit;
}
- if (dev->intf == NULL) {
+ if (dev->disconnected) {
/* the device was unplugged before the file was released */
mutex_unlock(&dev->mutex);
/* unlock here as ld_usb_delete frees dev */
@@ -427,7 +421,7 @@ static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
dev = file->private_data;
- if (!dev->intf)
+ if (dev->disconnected)
return POLLERR | POLLHUP;
poll_wait(file, &dev->read_wait, wait);
@@ -466,7 +460,7 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
}
/* verify that the device wasn't unplugged */
- if (dev->intf == NULL) {
+ if (dev->disconnected) {
retval = -ENODEV;
printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
goto unlock_exit;
@@ -474,7 +468,7 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
/* wait for data */
spin_lock_irq(&dev->rbsl);
- if (dev->ring_head == dev->ring_tail) {
+ while (dev->ring_head == dev->ring_tail) {
dev->interrupt_in_done = 0;
spin_unlock_irq(&dev->rbsl);
if (file->f_flags & O_NONBLOCK) {
@@ -484,12 +478,17 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
if (retval < 0)
goto unlock_exit;
- } else {
- spin_unlock_irq(&dev->rbsl);
+
+ spin_lock_irq(&dev->rbsl);
}
+ spin_unlock_irq(&dev->rbsl);
/* actual_buffer contains actual_length + interrupt_in_buffer */
actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
+ if (*actual_buffer > dev->interrupt_in_endpoint_size) {
+ retval = -EIO;
+ goto unlock_exit;
+ }
bytes_to_read = min(count, *actual_buffer);
if (bytes_to_read < *actual_buffer)
dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
@@ -500,11 +499,11 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
retval = -EFAULT;
goto unlock_exit;
}
- dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
-
retval = bytes_to_read;
spin_lock_irq(&dev->rbsl);
+ dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
+
if (dev->buffer_overflow) {
dev->buffer_overflow = 0;
spin_unlock_irq(&dev->rbsl);
@@ -546,7 +545,7 @@ static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
}
/* verify that the device wasn't unplugged */
- if (dev->intf == NULL) {
+ if (dev->disconnected) {
retval = -ENODEV;
printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
goto unlock_exit;
@@ -585,7 +584,7 @@ static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
1 << 8, 0,
dev->interrupt_out_buffer,
bytes_to_write,
- USB_CTRL_SET_TIMEOUT * HZ);
+ USB_CTRL_SET_TIMEOUT);
if (retval < 0)
dev_err(&dev->intf->dev,
"Couldn't submit HID_REQ_SET_REPORT %d\n",
@@ -705,7 +704,9 @@ static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *
dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
- dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
+ dev->ring_buffer = kcalloc(ring_buffer_size,
+ sizeof(size_t) + dev->interrupt_in_endpoint_size,
+ GFP_KERNEL);
if (!dev->ring_buffer)
goto error;
dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
@@ -768,6 +769,9 @@ static void ld_usb_disconnect(struct usb_interface *intf)
/* give back our minor */
usb_deregister_dev(intf, &ld_usb_class);
+ usb_poison_urb(dev->interrupt_in_urb);
+ usb_poison_urb(dev->interrupt_out_urb);
+
mutex_lock(&dev->mutex);
/* if the device is not opened, then we clean up right now */
@@ -775,7 +779,7 @@ static void ld_usb_disconnect(struct usb_interface *intf)
mutex_unlock(&dev->mutex);
ld_usb_delete(dev);
} else {
- dev->intf = NULL;
+ dev->disconnected = 1;
/* wake up pollers */
wake_up_interruptible_all(&dev->read_wait);
wake_up_interruptible_all(&dev->write_wait);
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-25 01:04:12 +0000