diff options
| -rw-r--r-- | drivers/usb/class/usblp.c | 71 |
1 files changed, 24 insertions, 47 deletions
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c index dba4cc026077..d34848ac30b0 100644 --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -7,6 +7,7 @@ * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz> # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com> # Copyright (c) 2001 David Paschal <paschal@rcsis.com> + * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name> * * USB Printer Device Class driver for USB printers and printer cables * @@ -273,13 +274,16 @@ static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs) { struct usblp *usblp = urb->context; - if (!usblp || !usblp->dev || !usblp->used || !usblp->present) + if (unlikely(!usblp || !usblp->dev || !usblp->used)) return; + if (unlikely(!usblp->present)) + goto unplug; if (unlikely(urb->status)) warn("usblp%d: nonzero read/write bulk status received: %d", usblp->minor, urb->status); usblp->rcomplete = 1; +unplug: wake_up_interruptible(&usblp->wait); } @@ -287,13 +291,15 @@ static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs) { struct usblp *usblp = urb->context; - if (!usblp || !usblp->dev || !usblp->used || !usblp->present) + if (unlikely(!usblp || !usblp->dev || !usblp->used)) return; - + if (unlikely(!usblp->present)) + goto unplug; if (unlikely(urb->status)) warn("usblp%d: nonzero read/write bulk status received: %d", usblp->minor, urb->status); usblp->wcomplete = 1; +unplug: wake_up_interruptible(&usblp->wait); } @@ -627,9 +633,8 @@ done: static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { - DECLARE_WAITQUEUE(wait, current); struct usblp *usblp = file->private_data; - int timeout, err = 0, transfer_length = 0; + int timeout, rv, err = 0, transfer_length = 0; size_t writecount = 0; while (writecount < count) { @@ -641,24 +646,11 @@ static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t } timeout = USBLP_WRITE_TIMEOUT; - add_wait_queue(&usblp->wait, &wait); - while ( 1==1 ) { - if (signal_pending(current)) { - remove_wait_queue(&usblp->wait, &wait); - return writecount ? writecount : -EINTR; - } - set_current_state(TASK_INTERRUPTIBLE); - if (timeout && !usblp->wcomplete) { - timeout = schedule_timeout(timeout); - } else { - set_current_state(TASK_RUNNING); - break; - } - } - remove_wait_queue(&usblp->wait, &wait); + rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout); + if (rv < 0) + return writecount ? writecount : -EINTR; } - down (&usblp->sem); if (!usblp->present) { up (&usblp->sem); @@ -724,7 +716,7 @@ static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) { struct usblp *usblp = file->private_data; - DECLARE_WAITQUEUE(wait, current); + int rv; if (!usblp->bidir) return -EINVAL; @@ -742,26 +734,13 @@ static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, count = -EAGAIN; goto done; } - - add_wait_queue(&usblp->wait, &wait); - while (1==1) { - if (signal_pending(current)) { - count = -EINTR; - remove_wait_queue(&usblp->wait, &wait); - goto done; - } - up (&usblp->sem); - set_current_state(TASK_INTERRUPTIBLE); - if (!usblp->rcomplete) { - schedule(); - } else { - set_current_state(TASK_RUNNING); - down(&usblp->sem); - break; - } - down (&usblp->sem); + up(&usblp->sem); + rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present); + down(&usblp->sem); + if (rv < 0) { + count = -EINTR; + goto done; } - remove_wait_queue(&usblp->wait, &wait); } if (!usblp->present) { @@ -874,11 +853,10 @@ static int usblp_probe(struct usb_interface *intf, /* Malloc and start initializing usblp structure so we can use it * directly. */ - if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) { + if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) { err("out of memory for usblp"); goto abort; } - memset(usblp, 0, sizeof(struct usblp)); usblp->dev = dev; init_MUTEX (&usblp->sem); init_waitqueue_head(&usblp->wait); @@ -1214,10 +1192,9 @@ static int __init usblp_init(void) { int retval; retval = usb_register(&usblp_driver); - if (retval) - goto out; - info(DRIVER_VERSION ": " DRIVER_DESC); -out: + if (!retval) + info(DRIVER_VERSION ": " DRIVER_DESC); + return retval; } |