udlfb: handle unplug properly

The udlfb driver maintained an open count and cleaned up itself when the
count reached zero. But the console is also counted in the reference count
- so, if the user unplugged the device, the open count would not drop to
zero and the driver stayed loaded with console attached. If the user
re-plugged the adapter, it would create a device /dev/fb1, show green
screen and the access to the console would be lost.

The framebuffer subsystem has reference counting on its own - in order to
fix the unplug bug, we rely the framebuffer reference counting. When the
user unplugs the adapter, we call unregister_framebuffer unconditionally.
unregister_framebuffer will unbind the console, wait until all users stop
using the framebuffer and then call the fb_destroy method. The fb_destroy
cleans up the USB driver.

This patch makes the following changes:
* Drop dlfb->kref and rely on implicit framebuffer reference counting
  instead.
* dlfb_usb_disconnect calls unregister_framebuffer, the rest of driver
  cleanup is done in the function dlfb_ops_destroy. dlfb_ops_destroy will
  be called by the framebuffer subsystem when no processes have the
  framebuffer open or mapped.
* We don't use workqueue during initialization, but initialize directly
  from dlfb_usb_probe. The workqueue could race with dlfb_usb_disconnect
  and this racing would produce various kinds of memory corruption.
* We use usb_get_dev and usb_put_dev to make sure that the USB subsystem
  doesn't free the device under us.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
cc: Dave Airlie <airlied@redhat.com>
Cc: Bernie Thompson <bernie@plugable.com>,
Cc: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

2 files changed, 37 insertions, 107 deletions

diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c
index afbd6101c78e..070026a7e55a 100644
--- a/drivers/video/fbdev/udlfb.c
+++ b/drivers/video/fbdev/udlfb.c
@@ -916,8 +916,6 @@ static int dlfb_ops_open(struct fb_info *info, int user)
 
         dlfb->fb_count++;
 
-        kref_get(&dlfb->kref);
-
         if (fb_defio && (info->fbdefio == NULL)) {
                 /* enable defio at last moment if not disabled by client */
 
@@ -940,14 +938,17 @@ static int dlfb_ops_open(struct fb_info *info, int user)
         return 0;
 }
 
-/*
- * Called when all client interfaces to start transactions have been disabled,
- * and all references to our device instance (dlfb_data) are released.
- * Every transaction must have a reference, so we know are fully spun down
- */
-static void dlfb_free(struct kref *kref)
+static void dlfb_ops_destroy(struct fb_info *info)
 {
-        struct dlfb_data *dlfb = container_of(kref, struct dlfb_data, kref);
+        struct dlfb_data *dlfb = info->par;
+
+        if (info->cmap.len != 0)
+                fb_dealloc_cmap(&info->cmap);
+        if (info->monspecs.modedb)
+                fb_destroy_modedb(info->monspecs.modedb);
+        vfree(info->screen_base);
+
+        fb_destroy_modelist(&info->modelist);
 
         while (!list_empty(&dlfb->deferred_free)) {
                 struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list);
@@ -957,40 +958,13 @@ static void dlfb_free(struct kref *kref)
         }
         vfree(dlfb->backing_buffer);
         kfree(dlfb->edid);
+        usb_put_dev(dlfb->udev);
         kfree(dlfb);
-}
-
-static void dlfb_free_framebuffer(struct dlfb_data *dlfb)
-{
-        struct fb_info *info = dlfb->info;
-
-        if (info) {
-                unregister_framebuffer(info);
-
-                if (info->cmap.len != 0)
-                        fb_dealloc_cmap(&info->cmap);
-                if (info->monspecs.modedb)
-                        fb_destroy_modedb(info->monspecs.modedb);
-                vfree(info->screen_base);
-
-                fb_destroy_modelist(&info->modelist);
-
-                dlfb->info = NULL;
-
-                /* Assume info structure is freed after this point */
-                framebuffer_release(info);
-        }
 
-        /* ref taken in probe() as part of registering framebfufer */
-        kref_put(&dlfb->kref, dlfb_free);
+        /* Assume info structure is freed after this point */
+        framebuffer_release(info);
 }
 
-static void dlfb_free_framebuffer_work(struct work_struct *work)
-{
-        struct dlfb_data *dlfb = container_of(work, struct dlfb_data,
-                                             free_framebuffer_work.work);
-        dlfb_free_framebuffer(dlfb);
-}
 /*
  * Assumes caller is holding info->lock mutex (for open and release at least)
  */
@@ -1000,10 +974,6 @@ static int dlfb_ops_release(struct fb_info *info, int user)
 
         dlfb->fb_count--;
 
-        /* We can't free fb_info here - fbmem will touch it when we return */
-        if (dlfb->virtualized && (dlfb->fb_count == 0))
-                schedule_delayed_work(&dlfb->free_framebuffer_work, HZ);
-
         if ((dlfb->fb_count == 0) && (info->fbdefio)) {
                 fb_deferred_io_cleanup(info);
                 kfree(info->fbdefio);
@@ -1013,8 +983,6 @@ static int dlfb_ops_release(struct fb_info *info, int user)
 
         dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count);
 
-        kref_put(&dlfb->kref, dlfb_free);
-
         return 0;
 }
 
@@ -1172,6 +1140,7 @@ static struct fb_ops dlfb_ops = {
         .fb_blank = dlfb_ops_blank,
         .fb_check_var = dlfb_ops_check_var,
         .fb_set_par = dlfb_ops_set_par,
+        .fb_destroy = dlfb_ops_destroy,
 };
 
 
@@ -1615,12 +1584,13 @@ success:
         return true;
 }
 
-static void dlfb_init_framebuffer_work(struct work_struct *work);
-
 static int dlfb_usb_probe(struct usb_interface *intf,
                           const struct usb_device_id *id)
 {
+        int i;
+        const struct device_attribute *attr;
         struct dlfb_data *dlfb;
+        struct fb_info *info;
         int retval = -ENOMEM;
         struct usb_device *usbdev = interface_to_usbdev(intf);
 
@@ -1631,10 +1601,9 @@ static int dlfb_usb_probe(struct usb_interface *intf,
                 goto error;
         }
 
-        kref_init(&dlfb->kref); /* matching kref_put in usb .disconnect fn */
         INIT_LIST_HEAD(&dlfb->deferred_free);
 
-        dlfb->udev = usbdev;
+        dlfb->udev = usb_get_dev(usbdev);
         usb_set_intfdata(intf, dlfb);
 
         dev_dbg(&intf->dev, "console enable=%d\n", console);
@@ -1657,42 +1626,6 @@ static int dlfb_usb_probe(struct usb_interface *intf,
         }
 
 
-        if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
-                retval = -ENOMEM;
-                dev_err(&intf->dev, "unable to allocate urb list\n");
-                goto error;
-        }
-
-        kref_get(&dlfb->kref); /* matching kref_put in free_framebuffer_work */
-
-        /* We don't register a new USB class. Our client interface is dlfbev */
-
-        /* Workitem keep things fast & simple during USB enumeration */
-        INIT_DELAYED_WORK(&dlfb->init_framebuffer_work,
-                          dlfb_init_framebuffer_work);
-        schedule_delayed_work(&dlfb->init_framebuffer_work, 0);
-
-        return 0;
-
-error:
-        if (dlfb) {
-
-                kref_put(&dlfb->kref, dlfb_free); /* last ref from kref_init */
-
-                /* dev has been deallocated. Do not dereference */
-        }
-
-        return retval;
-}
-
-static void dlfb_init_framebuffer_work(struct work_struct *work)
-{
-        int i, retval;
-        struct fb_info *info;
-        const struct device_attribute *attr;
-        struct dlfb_data *dlfb = container_of(work, struct dlfb_data,
-                                             init_framebuffer_work.work);
-
         /* allocates framebuffer driver structure, not framebuffer memory */
         info = framebuffer_alloc(0, &dlfb->udev->dev);
         if (!info) {
@@ -1706,17 +1639,22 @@ static void dlfb_init_framebuffer_work(struct work_struct *work)
         dlfb->ops = dlfb_ops;
         info->fbops = &dlfb->ops;
 
+        INIT_LIST_HEAD(&info->modelist);
+
+        if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
+                retval = -ENOMEM;
+                dev_err(&intf->dev, "unable to allocate urb list\n");
+                goto error;
+        }
+
+        /* We don't register a new USB class. Our client interface is dlfbev */
+
         retval = fb_alloc_cmap(&info->cmap, 256, 0);
         if (retval < 0) {
                 dev_err(info->device, "cmap allocation failed: %d\n", retval);
                 goto error;
         }
 
-        INIT_DELAYED_WORK(&dlfb->free_framebuffer_work,
-                          dlfb_free_framebuffer_work);
-
-        INIT_LIST_HEAD(&info->modelist);
-
         retval = dlfb_setup_modes(dlfb, info, NULL, 0);
         if (retval != 0) {
                 dev_err(info->device,
@@ -1760,10 +1698,16 @@ static void dlfb_init_framebuffer_work(struct work_struct *work)
                  dev_name(info->dev), info->var.xres, info->var.yres,
                  ((dlfb->backing_buffer) ?
                  info->fix.smem_len * 2 : info->fix.smem_len) >> 10);
-        return;
+        return 0;
 
 error:
-        dlfb_free_framebuffer(dlfb);
+        if (dlfb->info) {
+                dlfb_ops_destroy(dlfb->info);
+        } else if (dlfb) {
+                usb_put_dev(dlfb->udev);
+                kfree(dlfb);
+        }
+        return retval;
 }
 
 static void dlfb_usb_disconnect(struct usb_interface *intf)
@@ -1791,20 +1735,9 @@ static void dlfb_usb_disconnect(struct usb_interface *intf)
                 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
                         device_remove_file(info->dev, &fb_device_attrs[i]);
                 device_remove_bin_file(info->dev, &edid_attr);
-                unlink_framebuffer(info);
         }
 
-        usb_set_intfdata(intf, NULL);
-        dlfb->udev = NULL;
-
-        /* if clients still have us open, will be freed on last close */
-        if (dlfb->fb_count == 0)
-                schedule_delayed_work(&dlfb->free_framebuffer_work, 0);
-
-        /* release reference taken by kref_init in probe() */
-        kref_put(&dlfb->kref, dlfb_free);
-
-        /* consider dlfb_data freed */
+        unregister_framebuffer(info);
 }
 
 static struct usb_driver dlfb_driver = {
diff --git a/include/video/udlfb.h b/include/video/udlfb.h
index 3abd327bada6..7d09e54ae54e 100644
--- a/include/video/udlfb.h
+++ b/include/video/udlfb.h
@@ -36,12 +36,9 @@ struct dlfb_data {
         struct usb_device *udev;
         struct fb_info *info;
         struct urb_list urbs;
-        struct kref kref;
         char *backing_buffer;
         int fb_count;
         bool virtualized; /* true when physical usb device not present */
-        struct delayed_work init_framebuffer_work;
-        struct delayed_work free_framebuffer_work;
         atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
         atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
         char *edid; /* null until we read edid from hw or get from sysfs */