1 files changed, 71 insertions, 8 deletions

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index a161d70e1e42..809d465eb257 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -154,6 +154,7 @@ struct usblp {
         unsigned char           used;                   /* True if open */
         unsigned char           present;                /* True if not disconnected */
         unsigned char           bidir;                  /* interface is bidirectional */
+        unsigned char           sleeping;               /* interface is suspended */
         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
                                                         /* first 2 bytes are (big-endian) length */
 };
@@ -183,6 +184,7 @@ static void usblp_dump(struct usblp *usblp) {
         dbg("quirks=%d", usblp->quirks);
         dbg("used=%d", usblp->used);
         dbg("bidir=%d", usblp->bidir);
+        dbg("sleeping=%d", usblp->sleeping);
         dbg("device_id_string=\"%s\"",
                 usblp->device_id_string ?
                         usblp->device_id_string + 2 :
@@ -338,6 +340,20 @@ static int usblp_check_status(struct usblp *usblp, int err)
         return newerr;
 }
 
+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) {
+                        usblp->used = 0;
+                        return -EIO;
+                }
+        }
+
+        return 0;
+}
+
 /*
  * File op functions.
  */
@@ -390,14 +406,9 @@ static int usblp_open(struct inode *inode, struct file *file)
         usblp->writeurb->status = 0;
         usblp->readurb->status = 0;
 
-        if (usblp->bidir) {
-                usblp->readcount = 0;
-                usblp->readurb->dev = usblp->dev;
-                if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
-                        retval = -EIO;
-                        usblp->used = 0;
-                        file->private_data = NULL;
-                }
+        if (handle_bidir(usblp) < 0) {
+                file->private_data = NULL;
+                retval = -EIO;
         }
 out:
         mutex_unlock (&usblp_mutex);
@@ -460,6 +471,11 @@ static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                 goto done;
         }
 
+        if (usblp->sleeping) {
+                retval = -ENODEV;
+                goto done;
+        }
+
         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 
@@ -658,6 +674,11 @@ static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t
                         return -ENODEV;
                 }
 
+                if (usblp->sleeping) {
+                        up (&usblp->sem);
+                        return writecount ? writecount : -ENODEV;
+                }
+
                 if (usblp->writeurb->status != 0) {
                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
                                 if (!usblp->wcomplete)
@@ -749,6 +770,11 @@ static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count,
                 goto done;
         }
 
+        if (usblp->sleeping) {
+                count = -ENODEV;
+                goto done;
+        }
+
         if (usblp->readurb->status) {
                 err("usblp%d: error %d reading from printer",
                         usblp->minor, usblp->readurb->status);
@@ -1167,6 +1193,41 @@ static void usblp_disconnect(struct usb_interface *intf)
         mutex_unlock (&usblp_mutex);
 }
 
+static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
+{
+        struct usblp *usblp = usb_get_intfdata (intf);
+
+        /* this races against normal access and open */
+        mutex_lock (&usblp_mutex);
+        down (&usblp->sem);
+        /* we take no more IO */
+        usblp->sleeping = 1;
+        /* we wait for anything printing */
+        wait_event (usblp->wait, usblp->wcomplete || !usblp->present);
+        usblp_unlink_urbs(usblp);
+        up (&usblp->sem);
+        mutex_unlock (&usblp_mutex);
+
+        return 0;
+}
+
+static int usblp_resume (struct usb_interface *intf)
+{
+        struct usblp *usblp = usb_get_intfdata (intf);
+        int r;
+
+        mutex_lock (&usblp_mutex);
+        down (&usblp->sem);
+
+        usblp->sleeping = 0;
+        r = handle_bidir (usblp);
+
+        up (&usblp->sem);
+        mutex_unlock (&usblp_mutex);
+
+        return r;
+}
+
 static struct usb_device_id usblp_ids [] = {
         { USB_DEVICE_INFO(7, 1, 1) },
         { USB_DEVICE_INFO(7, 1, 2) },
@@ -1183,6 +1244,8 @@ static struct usb_driver usblp_driver = {
         .name =         "usblp",
         .probe =        usblp_probe,
         .disconnect =   usblp_disconnect,
+        .suspend =      usblp_suspend,
+        .resume =       usblp_resume,
         .id_table =     usblp_ids,
 };