diff options
Diffstat (limited to 'drivers/usb/class/usblp.c')
| -rw-r--r-- | drivers/usb/class/usblp.c | 618 |
1 files changed, 376 insertions, 242 deletions
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c index 6778f9af794..9a1478972bf 100644 --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -1,5 +1,5 @@ /* - * usblp.c Version 0.13 + * usblp.c * * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com> * Copyright (c) 1999 Pavel Machek <pavel@suse.cz> @@ -61,11 +61,11 @@ /* * Version Information */ -#define DRIVER_VERSION "v0.13" #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal" #define DRIVER_DESC "USB Printer Device Class driver" #define USBLP_BUF_SIZE 8192 +#define USBLP_BUF_SIZE_IN 1024 #define USBLP_DEVICE_ID_SIZE 1024 /* ioctls: */ @@ -127,14 +127,22 @@ MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:H */ #define STATUS_BUF_SIZE 8 +/* + * Locks down the locking order: + * ->wmut locks wstatus. + * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection, + * [rw]status. We only touch status when we know the side idle. + * ->lock locks what interrupt accesses. + */ struct usblp { struct usb_device *dev; /* USB device */ - struct mutex mut; /* locks this struct, especially "dev" */ - char *writebuf; /* write transfer_buffer */ + struct mutex wmut; + struct mutex mut; + spinlock_t lock; /* locks rcomplete, wcomplete */ char *readbuf; /* read transfer_buffer */ char *statusbuf; /* status transfer_buffer */ - struct urb *readurb, *writeurb; /* The urbs */ - wait_queue_head_t wait; /* Zzzzz ... */ + struct usb_anchor urbs; + wait_queue_head_t rwait, wwait; int readcount; /* Counter for reads */ int ifnum; /* Interface number */ struct usb_interface *intf; /* The interface */ @@ -147,8 +155,9 @@ struct usblp { } protocol[USBLP_MAX_PROTOCOLS]; int current_protocol; int minor; /* minor number of device */ - int wcomplete; /* writing is completed */ - int rcomplete; /* reading is completed */ + int wcomplete, rcomplete; + int wstatus; /* bytes written or error */ + int rstatus; /* bytes ready or error */ unsigned int quirks; /* quirks flags */ unsigned char used; /* True if open */ unsigned char present; /* True if not disconnected */ @@ -166,9 +175,6 @@ static void usblp_dump(struct usblp *usblp) { dbg("dev=0x%p", usblp->dev); dbg("present=%d", usblp->present); dbg("readbuf=0x%p", usblp->readbuf); - dbg("writebuf=0x%p", usblp->writebuf); - dbg("readurb=0x%p", usblp->readurb); - dbg("writeurb=0x%p", usblp->writeurb); dbg("readcount=%d", usblp->readcount); dbg("ifnum=%d", usblp->ifnum); for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) { @@ -178,8 +184,8 @@ static void usblp_dump(struct usblp *usblp) { } dbg("current_protocol=%d", usblp->current_protocol); dbg("minor=%d", usblp->minor); - dbg("wcomplete=%d", usblp->wcomplete); - dbg("rcomplete=%d", usblp->rcomplete); + dbg("wstatus=%d", usblp->wstatus); + dbg("rstatus=%d", usblp->rstatus); dbg("quirks=%d", usblp->quirks); dbg("used=%d", usblp->used); dbg("bidir=%d", usblp->bidir); @@ -222,6 +228,11 @@ static const struct quirk_printer_struct quirk_printers[] = { { 0, 0 } }; +static int usblp_wwait(struct usblp *usblp, int nonblock); +static int usblp_wtest(struct usblp *usblp, int nonblock); +static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock); +static int usblp_rtest(struct usblp *usblp, int nonblock); +static int usblp_submit_read(struct usblp *usblp); static int usblp_select_alts(struct usblp *usblp); static int usblp_set_protocol(struct usblp *usblp, int protocol); static int usblp_cache_device_id_string(struct usblp *usblp); @@ -279,33 +290,47 @@ static void usblp_bulk_read(struct urb *urb) { struct usblp *usblp = urb->context; - 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); + if (usblp->present && usblp->used) { + if (urb->status) + printk(KERN_WARNING "usblp%d: " + "nonzero read bulk status received: %d\n", + usblp->minor, urb->status); + } + spin_lock(&usblp->lock); + if (urb->status < 0) + usblp->rstatus = urb->status; + else + usblp->rstatus = urb->actual_length; usblp->rcomplete = 1; -unplug: - wake_up_interruptible(&usblp->wait); + wake_up(&usblp->rwait); + spin_unlock(&usblp->lock); + + usb_free_urb(urb); } static void usblp_bulk_write(struct urb *urb) { struct usblp *usblp = urb->context; - 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); + if (usblp->present && usblp->used) { + if (urb->status) + printk(KERN_WARNING "usblp%d: " + "nonzero write bulk status received: %d\n", + usblp->minor, urb->status); + } + spin_lock(&usblp->lock); + if (urb->status < 0) + usblp->wstatus = urb->status; + else + usblp->wstatus = urb->actual_length; usblp->wcomplete = 1; -unplug: - wake_up_interruptible(&usblp->wait); + wake_up(&usblp->wwait); + spin_unlock(&usblp->lock); + + /* XXX Use usb_setup_bulk_urb when available. Talk to Marcel. */ + kfree(urb->transfer_buffer); + urb->transfer_buffer = NULL; /* Not refcounted, so to be safe... */ + usb_free_urb(urb); } /* @@ -322,7 +347,8 @@ static int usblp_check_status(struct usblp *usblp, int err) error = usblp_read_status (usblp, usblp->statusbuf); if (error < 0) { if (printk_ratelimit()) - err("usblp%d: error %d reading printer status", + printk(KERN_ERR + "usblp%d: error %d reading printer status\n", usblp->minor, error); return 0; } @@ -336,8 +362,10 @@ static int usblp_check_status(struct usblp *usblp, int err) if (~status & LP_PSELECD) newerr = 2; - if (newerr != err) - info("usblp%d: %s", usblp->minor, usblp_messages[newerr]); + if (newerr != err) { + printk(KERN_INFO "usblp%d: %s\n", + usblp->minor, usblp_messages[newerr]); + } return newerr; } @@ -345,12 +373,9 @@ static int usblp_check_status(struct usblp *usblp, int err) static int handle_bidir (struct usblp *usblp) { if (usblp->bidir && usblp->used && !usblp->sleeping) { - usblp->readcount = 0; - usblp->readurb->dev = usblp->dev; - if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) + if (usblp_submit_read(usblp) < 0) return -EIO; } - return 0; } @@ -403,11 +428,9 @@ static int usblp_open(struct inode *inode, struct file *file) usblp->used = 1; file->private_data = usblp; - usblp->writeurb->transfer_buffer_length = 0; usblp->wcomplete = 1; /* we begin writeable */ + usblp->wstatus = 0; usblp->rcomplete = 0; - usblp->writeurb->status = 0; - usblp->readurb->status = 0; if (handle_bidir(usblp) < 0) { usblp->used = 0; @@ -421,20 +444,17 @@ out: static void usblp_cleanup (struct usblp *usblp) { - info("usblp%d: removed", usblp->minor); + printk(KERN_INFO "usblp%d: removed\n", usblp->minor); + kfree(usblp->readbuf); kfree (usblp->device_id_string); kfree (usblp->statusbuf); - usb_free_urb(usblp->writeurb); - usb_free_urb(usblp->readurb); kfree (usblp); } static void usblp_unlink_urbs(struct usblp *usblp) { - usb_kill_urb(usblp->writeurb); - if (usblp->bidir) - usb_kill_urb(usblp->readurb); + usb_kill_anchored_urbs(&usblp->urbs); } static int usblp_release(struct inode *inode, struct file *file) @@ -455,10 +475,18 @@ static int usblp_release(struct inode *inode, struct file *file) /* No kernel lock - fine */ static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait) { + int ret; + unsigned long flags; + struct usblp *usblp = file->private_data; - poll_wait(file, &usblp->wait, wait); - return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM) + /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */ + poll_wait(file, &usblp->rwait, wait); + poll_wait(file, &usblp->wwait, wait); + spin_lock_irqsave(&usblp->lock, flags); + ret = ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM) | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM); + spin_unlock_irqrestore(&usblp->lock, flags); + return ret; } static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) @@ -632,10 +660,11 @@ static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) switch (cmd) { case LPGETSTATUS: - if (usblp_read_status(usblp, usblp->statusbuf)) { + if ((retval = usblp_read_status(usblp, usblp->statusbuf))) { if (printk_ratelimit()) - err("usblp%d: failed reading printer status", - usblp->minor); + printk(KERN_ERR "usblp%d:" + "failed reading printer status (%d)\n", + usblp->minor, retval); retval = -EIO; goto done; } @@ -656,168 +685,303 @@ done: static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { struct usblp *usblp = file->private_data; - int timeout, intr, rv, err = 0, transfer_length = 0; - size_t writecount = 0; + char *writebuf; + struct urb *writeurb; + int rv; + int transfer_length; + ssize_t writecount = 0; + + if (mutex_lock_interruptible(&usblp->wmut)) { + rv = -EINTR; + goto raise_biglock; + } + if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0) + goto raise_wait; while (writecount < count) { - if (!usblp->wcomplete) { - barrier(); - if (file->f_flags & O_NONBLOCK) { - writecount += transfer_length; - return writecount ? writecount : -EAGAIN; - } - - timeout = USBLP_WRITE_TIMEOUT; - - rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout); - if (rv < 0) - return writecount ? writecount : -EINTR; - } - intr = mutex_lock_interruptible (&usblp->mut); - if (intr) - return writecount ? writecount : -EINTR; - if (!usblp->present) { - mutex_unlock (&usblp->mut); - return -ENODEV; - } - - if (usblp->sleeping) { - mutex_unlock (&usblp->mut); - return writecount ? writecount : -ENODEV; - } - - if (usblp->writeurb->status != 0) { - if (usblp->quirks & USBLP_QUIRK_BIDIR) { - if (!usblp->wcomplete) - err("usblp%d: error %d writing to printer", - usblp->minor, usblp->writeurb->status); - err = usblp->writeurb->status; - } else - err = usblp_check_status(usblp, err); - mutex_unlock (&usblp->mut); - - /* if the fault was due to disconnect, let khubd's - * call to usblp_disconnect() grab usblp->mut ... - */ - schedule (); - continue; - } - - /* We must increment writecount here, and not at the - * end of the loop. Otherwise, the final loop iteration may - * be skipped, leading to incomplete printer output. + /* + * Step 1: Submit next block. */ - writecount += transfer_length; - if (writecount == count) { - mutex_unlock(&usblp->mut); - break; - } - - transfer_length=(count - writecount); - if (transfer_length > USBLP_BUF_SIZE) + if ((transfer_length = count - writecount) > USBLP_BUF_SIZE) transfer_length = USBLP_BUF_SIZE; - usblp->writeurb->transfer_buffer_length = transfer_length; - - if (copy_from_user(usblp->writeurb->transfer_buffer, + rv = -ENOMEM; + if ((writebuf = kmalloc(USBLP_BUF_SIZE, GFP_KERNEL)) == NULL) + goto raise_buf; + if ((writeurb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) + goto raise_urb; + usb_fill_bulk_urb(writeurb, usblp->dev, + usb_sndbulkpipe(usblp->dev, + usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress), + writebuf, transfer_length, usblp_bulk_write, usblp); + usb_anchor_urb(writeurb, &usblp->urbs); + + if (copy_from_user(writebuf, buffer + writecount, transfer_length)) { - mutex_unlock(&usblp->mut); - return writecount ? writecount : -EFAULT; + rv = -EFAULT; + goto raise_badaddr; } - usblp->writeurb->dev = usblp->dev; + spin_lock_irq(&usblp->lock); usblp->wcomplete = 0; - err = usb_submit_urb(usblp->writeurb, GFP_KERNEL); - if (err) { + spin_unlock_irq(&usblp->lock); + if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) { + usblp->wstatus = 0; + spin_lock_irq(&usblp->lock); usblp->wcomplete = 1; - if (err != -ENOMEM) - count = -EIO; - else - count = writecount ? writecount : -ENOMEM; - mutex_unlock (&usblp->mut); - break; + wake_up(&usblp->wwait); + spin_unlock_irq(&usblp->lock); + if (rv != -ENOMEM) + rv = -EIO; + goto raise_submit; + } + + /* + * Step 2: Wait for transfer to end, collect results. + */ + rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK)); + if (rv < 0) { + /* + * If interrupted, we simply leave the URB to dangle, + * so the ->release will call usb_kill_urb(). + */ + goto collect_error; } - mutex_unlock (&usblp->mut); + + if (usblp->wstatus < 0) { + usblp_check_status(usblp, 0); + rv = -EIO; + goto collect_error; + } + /* + * This is critical: it must be our URB, not other writer's. + * The wmut exists mainly to cover us here. + */ + writecount += usblp->wstatus; } - return count; + mutex_unlock(&usblp->wmut); + return writecount; + +raise_submit: +raise_badaddr: + usb_unanchor_urb(writeurb); + usb_free_urb(writeurb); +raise_urb: + kfree(writebuf); +raise_buf: +raise_wait: +collect_error: /* Out of raise sequence */ + mutex_unlock(&usblp->wmut); +raise_biglock: + return writecount ? writecount : rv; } -static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) +/* + * Notice that we fail to restart in a few cases: on EFAULT, on restart + * error, etc. This is the historical behaviour. In all such cases we return + * EIO, and applications loop in order to get the new read going. + */ +static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos) { struct usblp *usblp = file->private_data; - int rv, intr; + ssize_t count; + ssize_t avail; + int rv; if (!usblp->bidir) return -EINVAL; - intr = mutex_lock_interruptible (&usblp->mut); - if (intr) - return -EINTR; - if (!usblp->present) { - count = -ENODEV; + rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK)); + if (rv < 0) + return rv; + + if ((avail = usblp->rstatus) < 0) { + printk(KERN_ERR "usblp%d: error %d reading from printer\n", + usblp->minor, (int)avail); + usblp_submit_read(usblp); + count = -EIO; goto done; } - if (!usblp->rcomplete) { - barrier(); + count = len < avail - usblp->readcount ? len : avail - usblp->readcount; + if (count != 0 && + copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) { + count = -EFAULT; + goto done; + } - if (file->f_flags & O_NONBLOCK) { - count = -EAGAIN; - goto done; - } - mutex_unlock(&usblp->mut); - rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present); - mutex_lock(&usblp->mut); - if (rv < 0) { - count = -EINTR; + if ((usblp->readcount += count) == avail) { + if (usblp_submit_read(usblp) < 0) { + /* We don't want to leak USB return codes into errno. */ + if (count == 0) + count = -EIO; goto done; } } - if (!usblp->present) { - count = -ENODEV; - goto done; +done: + mutex_unlock (&usblp->mut); + return count; +} + +/* + * Wait for the write path to come idle. + * This is called under the ->wmut, so the idle path stays idle. + * + * Our write path has a peculiar property: it does not buffer like a tty, + * but waits for the write to succeed. This allows our ->release to bug out + * without waiting for writes to drain. But it obviously does not work + * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use + * select(2) or poll(2) to wait for the buffer to drain before closing. + * Alternatively, set blocking mode with fcntl and issue a zero-size write. + * + * Old v0.13 code had a non-functional timeout for wait_event(). Someone forgot + * to check the return code for timeout expiration, so it had no effect. + * Apparently, it was intended to check for error conditons, such as out + * of paper. It is going to return when we settle things with CUPS. XXX + */ +static int usblp_wwait(struct usblp *usblp, int nonblock) +{ + DECLARE_WAITQUEUE(waita, current); + int rc; + + add_wait_queue(&usblp->wwait, &waita); + for (;;) { + if (mutex_lock_interruptible(&usblp->mut)) { + rc = -EINTR; + break; + } + set_current_state(TASK_INTERRUPTIBLE); + if ((rc = usblp_wtest(usblp, nonblock)) < 0) { + mutex_unlock(&usblp->mut); + break; + } + mutex_unlock(&usblp->mut); + if (rc == 0) + break; + schedule(); } + set_current_state(TASK_RUNNING); + remove_wait_queue(&usblp->wwait, &waita); + return rc; +} - if (usblp->sleeping) { - count = -ENODEV; - goto done; +static int usblp_wtest(struct usblp *usblp, int nonblock) +{ + unsigned long flags; + + if (!usblp->present) + return -ENODEV; + if (signal_pending(current)) + return -EINTR; + spin_lock_irqsave(&usblp->lock, flags); + if (usblp->wcomplete) { + spin_unlock_irqrestore(&usblp->lock, flags); + return 0; } + spin_unlock_irqrestore(&usblp->lock, flags); + if (usblp->sleeping) + return -ENODEV; + if (nonblock) + return -EAGAIN; + return 1; +} - if (usblp->readurb->status) { - err("usblp%d: error %d reading from printer", - usblp->minor, usblp->readurb->status); - usblp->readurb->dev = usblp->dev; - usblp->readcount = 0; - usblp->rcomplete = 0; - if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) - dbg("error submitting urb"); - count = -EIO; - goto done; +/* + * Wait for read bytes to become available. This probably should have been + * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional + * name for functions which lock and return. + * + * We do not use wait_event_interruptible because it makes locking iffy. + */ +static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock) +{ + DECLARE_WAITQUEUE(waita, current); + int rc; + + add_wait_queue(&usblp->rwait, &waita); + for (;;) { + if (mutex_lock_interruptible(&usblp->mut)) { + rc = -EINTR; + break; + } + set_current_state(TASK_INTERRUPTIBLE); + if ((rc = usblp_rtest(usblp, nonblock)) < 0) { + mutex_unlock(&usblp->mut); + break; + } + if (rc == 0) /* Keep it locked */ + break; + mutex_unlock(&usblp->mut); + schedule(); } + set_current_state(TASK_RUNNING); + remove_wait_queue(&usblp->rwait, &waita); + return rc; +} - count = count < usblp->readurb->actual_length - usblp->readcount ? - count : usblp->readurb->actual_length - usblp->readcount; +static int usblp_rtest(struct usblp *usblp, int nonblock) +{ + unsigned long flags; - if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) { - count = -EFAULT; - goto done; + if (!usblp->present) + return -ENODEV; + if (signal_pending(current)) + return -EINTR; + spin_lock_irqsave(&usblp->lock, flags); + if (usblp->rcomplete) { + spin_unlock_irqrestore(&usblp->lock, flags); + return 0; } + spin_unlock_irqrestore(&usblp->lock, flags); + if (usblp->sleeping) + return -ENODEV; + if (nonblock) + return -EAGAIN; + return 1; +} - if ((usblp->readcount += count) == usblp->readurb->actual_length) { - usblp->readcount = 0; - usblp->readurb->dev = usblp->dev; - usblp->rcomplete = 0; - if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) { - count = -EIO; - goto done; - } +/* + * Please check ->bidir and other such things outside for now. + */ +static int usblp_submit_read(struct usblp *usblp) +{ + struct urb *urb; + unsigned long flags; + int rc; + + rc = -ENOMEM; + if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) + goto raise_urb; + + usb_fill_bulk_urb(urb, usblp->dev, + usb_rcvbulkpipe(usblp->dev, + usblp->protocol[usblp->current_protocol].epread->bEndpointAddress), + usblp->readbuf, USBLP_BUF_SIZE_IN, + usblp_bulk_read, usblp); + usb_anchor_urb(urb, &usblp->urbs); + + spin_lock_irqsave(&usblp->lock, flags); + usblp->readcount = 0; /* XXX Why here? */ + usblp->rcomplete = 0; + spin_unlock_irqrestore(&usblp->lock, flags); + if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) { + dbg("error submitting urb (%d)", rc); + spin_lock_irqsave(&usblp->lock, flags); + usblp->rstatus = rc; + usblp->rcomplete = 1; + spin_unlock_irqrestore(&usblp->lock, flags); + goto raise_submit; } -done: - mutex_unlock (&usblp->mut); - return count; + return 0; + +raise_submit: + usb_unanchor_urb(urb); + usb_free_urb(urb); +raise_urb: + return rc; } /* @@ -891,55 +1055,41 @@ static int usblp_probe(struct usb_interface *intf, /* Malloc and start initializing usblp structure so we can use it * directly. */ if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) { - err("out of memory for usblp"); + retval = -ENOMEM; goto abort; } usblp->dev = dev; + mutex_init(&usblp->wmut); mutex_init (&usblp->mut); - init_waitqueue_head(&usblp->wait); + spin_lock_init(&usblp->lock); + init_waitqueue_head(&usblp->rwait); + init_waitqueue_head(&usblp->wwait); + init_usb_anchor(&usblp->urbs); usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; usblp->intf = intf; - usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL); - if (!usblp->writeurb) { - err("out of memory"); - goto abort; - } - usblp->readurb = usb_alloc_urb(0, GFP_KERNEL); - if (!usblp->readurb) { - err("out of memory"); - goto abort; - } - /* Malloc device ID string buffer to the largest expected length, * since we can re-query it on an ioctl and a dynamic string * could change in length. */ if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { - err("out of memory for device_id_string"); + retval = -ENOMEM; goto abort; } - usblp->writebuf = usblp->readbuf = NULL; - usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; - usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; - /* Malloc write & read buffers. We somewhat wastefully + /* + * Allocate read buffer. We somewhat wastefully * malloc both regardless of bidirectionality, because the - * alternate setting can be changed later via an ioctl. */ - if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE, - GFP_KERNEL, &usblp->writeurb->transfer_dma))) { - err("out of memory for write buf"); - goto abort; - } - if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE, - GFP_KERNEL, &usblp->readurb->transfer_dma))) { - err("out of memory for read buf"); + * alternate setting can be changed later via an ioctl. + */ + if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) { + retval = -ENOMEM; goto abort; } /* Allocate buffer for printer status */ usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); if (!usblp->statusbuf) { - err("out of memory for statusbuf"); + retval = -ENOMEM; goto abort; } @@ -954,12 +1104,15 @@ static int usblp_probe(struct usb_interface *intf, dbg("incompatible printer-class device 0x%4.4X/0x%4.4X", le16_to_cpu(dev->descriptor.idVendor), le16_to_cpu(dev->descriptor.idProduct)); + retval = -ENODEV; goto abort; } /* Setup the selected alternate setting and endpoints. */ - if (usblp_set_protocol(usblp, protocol) < 0) + if (usblp_set_protocol(usblp, protocol) < 0) { + retval = -ENODEV; /* ->probe isn't ->ioctl */ goto abort; + } /* Retrieve and store the device ID string. */ usblp_cache_device_id_string(usblp); @@ -977,12 +1130,14 @@ static int usblp_probe(struct usb_interface *intf, retval = usb_register_dev(intf, &usblp_class); if (retval) { - err("Not able to get a minor for this device."); + printk(KERN_ERR "usblp: Not able to get a minor" + " (base %u, slice default): %d\n", + USBLP_MINOR_BASE, retval); goto abort_intfdata; } usblp->minor = intf->minor; - info("usblp%d: USB %sdirectional printer dev %d " - "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X", + printk(KERN_INFO "usblp%d: USB %sdirectional printer dev %d " + "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n", usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, usblp->ifnum, usblp->protocol[usblp->current_protocol].alt_setting, @@ -997,19 +1152,12 @@ abort_intfdata: device_remove_file(&intf->dev, &dev_attr_ieee1284_id); abort: if (usblp) { - if (usblp->writebuf) - usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, - usblp->writebuf, usblp->writeurb->transfer_dma); - if (usblp->readbuf) - usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, - usblp->readbuf, usblp->readurb->transfer_dma); + kfree(usblp->readbuf); kfree(usblp->statusbuf); kfree(usblp->device_id_string); - usb_free_urb(usblp->writeurb); - usb_free_urb(usblp->readurb); kfree(usblp); } - return -EIO; + return retval; } /* @@ -1078,8 +1226,9 @@ static int usblp_select_alts(struct usblp *usblp) if (ifd->desc.bInterfaceProtocol == 1) { epread = NULL; } else if (usblp->quirks & USBLP_QUIRK_BIDIR) { - info("Disabling reads from problem bidirectional " - "printer on usblp%d", usblp->minor); + printk(KERN_INFO "usblp%d: Disabling reads from " + "problematic bidirectional printer\n", + usblp->minor); epread = NULL; } @@ -1119,25 +1268,12 @@ static int usblp_set_protocol(struct usblp *usblp, int protocol) return -EINVAL; r = usb_set_interface(usblp->dev, usblp->ifnum, alts); if (r < 0) { - err("can't set desired altsetting %d on interface %d", + printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n", alts, usblp->ifnum); return r; } - usb_fill_bulk_urb(usblp->writeurb, usblp->dev, - usb_sndbulkpipe(usblp->dev, - usblp->protocol[protocol].epwrite->bEndpointAddress), - usblp->writebuf, 0, - usblp_bulk_write, usblp); - usblp->bidir = (usblp->protocol[protocol].epread != NULL); - if (usblp->bidir) - usb_fill_bulk_urb(usblp->readurb, usblp->dev, - usb_rcvbulkpipe(usblp->dev, - usblp->protocol[protocol].epread->bEndpointAddress), - usblp->readbuf, USBLP_BUF_SIZE, - usblp_bulk_read, usblp); - usblp->current_protocol = protocol; dbg("usblp%d set protocol %d", usblp->minor, protocol); return 0; @@ -1190,13 +1326,11 @@ static void usblp_disconnect(struct usb_interface *intf) mutex_lock (&usblp_mutex); mutex_lock (&usblp->mut); usblp->present = 0; + wake_up(&usblp->wwait); + wake_up(&usblp->rwait); usb_set_intfdata (intf, NULL); usblp_unlink_urbs(usblp); - usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, - usblp->writebuf, usblp->writeurb->transfer_dma); - usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, - usblp->readbuf, usblp->readurb->transfer_dma); mutex_unlock (&usblp->mut); if (!usblp->used) @@ -1211,6 +1345,11 @@ static int usblp_suspend (struct usb_interface *intf, pm_message_t message) /* we take no more IO */ usblp->sleeping = 1; usblp_unlink_urbs(usblp); +#if 0 /* XXX Do we want this? What if someone is reading, should we fail? */ + /* not strictly necessary, but just in case */ + wake_up(&usblp->wwait); + wake_up(&usblp->rwait); +#endif return 0; } @@ -1251,12 +1390,7 @@ static struct usb_driver usblp_driver = { static int __init usblp_init(void) { - int retval; - retval = usb_register(&usblp_driver); - if (!retval) - info(DRIVER_VERSION ": " DRIVER_DESC); - - return retval; + return usb_register(&usblp_driver); } static void __exit usblp_exit(void) |