Commit ce880cb8 authored by Kay Sievers's avatar Kay Sievers Committed by Dave Airlie

udlfb: remove sysfs framebuffer device with USB .disconnect()

The USB graphics card driver delays the unregistering of the framebuffer
device to a workqueue, which breaks the userspace visible remove uevent
sequence. Recent userspace tools started to support USB graphics card
hotplug out-of-the-box and rely on proper events sent by the kernel.

The framebuffer device is a direct child of the USB interface which is
removed immediately after the USB .disconnect() callback. But the fb device
in /sys stays around until its final cleanup, at a time where all the parent
devices have been removed already.

To work around that, we remove the sysfs fb device directly in the USB
.disconnect() callback and leave only the cleanup of the internal fb
data to the delayed work.

Before:
 add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 (usb)
 add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0 (usb)
 add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/graphics/fb0 (graphics)
 remove   /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0 (usb)
 remove   /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 (usb)
 remove   /2-1.2:1.0/graphics/fb0 (graphics)

After:
 add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 (usb)
 add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0 (usb)
 add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/graphics/fb1 (graphics)
 remove   /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/graphics/fb1 (graphics)
 remove   /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0 (usb)
 remove   /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 (usb)

Cc: stable@vger.kernel.org
Tested-by: default avatarBernie Thompson <bernie@plugable.com>
Acked-by: default avatarBernie Thompson <bernie@plugable.com>
Signed-off-by: default avatarKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent 8229c885
...@@ -1665,6 +1665,7 @@ static int do_unregister_framebuffer(struct fb_info *fb_info) ...@@ -1665,6 +1665,7 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
if (ret) if (ret)
return -EINVAL; return -EINVAL;
unlink_framebuffer(fb_info);
if (fb_info->pixmap.addr && if (fb_info->pixmap.addr &&
(fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
kfree(fb_info->pixmap.addr); kfree(fb_info->pixmap.addr);
...@@ -1672,7 +1673,6 @@ static int do_unregister_framebuffer(struct fb_info *fb_info) ...@@ -1672,7 +1673,6 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
registered_fb[i] = NULL; registered_fb[i] = NULL;
num_registered_fb--; num_registered_fb--;
fb_cleanup_device(fb_info); fb_cleanup_device(fb_info);
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
event.info = fb_info; event.info = fb_info;
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
...@@ -1681,6 +1681,22 @@ static int do_unregister_framebuffer(struct fb_info *fb_info) ...@@ -1681,6 +1681,22 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
return 0; return 0;
} }
int unlink_framebuffer(struct fb_info *fb_info)
{
int i;
i = fb_info->node;
if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
return -EINVAL;
if (fb_info->dev) {
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
fb_info->dev = NULL;
}
return 0;
}
EXPORT_SYMBOL(unlink_framebuffer);
void remove_conflicting_framebuffers(struct apertures_struct *a, void remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary) const char *name, bool primary)
{ {
......
...@@ -1739,7 +1739,7 @@ static void dlfb_usb_disconnect(struct usb_interface *interface) ...@@ -1739,7 +1739,7 @@ static void dlfb_usb_disconnect(struct usb_interface *interface)
for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
device_remove_file(info->dev, &fb_device_attrs[i]); device_remove_file(info->dev, &fb_device_attrs[i]);
device_remove_bin_file(info->dev, &edid_attr); device_remove_bin_file(info->dev, &edid_attr);
unlink_framebuffer(info);
usb_set_intfdata(interface, NULL); usb_set_intfdata(interface, NULL);
/* if clients still have us open, will be freed on last close */ /* if clients still have us open, will be freed on last close */
......
...@@ -1003,6 +1003,7 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf, ...@@ -1003,6 +1003,7 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
/* drivers/video/fbmem.c */ /* drivers/video/fbmem.c */
extern int register_framebuffer(struct fb_info *fb_info); extern int register_framebuffer(struct fb_info *fb_info);
extern int unregister_framebuffer(struct fb_info *fb_info); extern int unregister_framebuffer(struct fb_info *fb_info);
extern int unlink_framebuffer(struct fb_info *fb_info);
extern void remove_conflicting_framebuffers(struct apertures_struct *a, extern void remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary); const char *name, bool primary);
extern int fb_prepare_logo(struct fb_info *fb_info, int rotate); extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
......
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