[media] uvcvideo: Remove unneeded device disconnected flag

The UVC_DEV_DISCONNECTED flag is set when the USB device is
disconnected, and checked in the open() handler to refuse opening a
device that has been disconnected.

This is inherently racy, but the race condition is taken care of in the
V4L2 core, which also fails open() calls when the V4L2 device node has
been unregistered. As the uvcvideo USB disconnect handler unregisters
all its video device nodes, the UVC_DEV_DISCONNECTED flag doesn't serve
any purpose anymore and can be removed.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 5970dd6..4b5b3e8 100644 (file)
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1967,8 +1967,6 @@ static void uvc_disconnect(struct usb_interface *intf)
            UVC_SC_VIDEOSTREAMING)
                return;
 
-       dev->state |= UVC_DEV_DISCONNECTED;
-
        uvc_unregister_video(dev);
 }
 

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 69d0180..2764f43 100644 (file)
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -483,9 +483,6 @@ static int uvc_v4l2_open(struct file *file)
        uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
        stream = video_drvdata(file);
 
-       if (stream->dev->state & UVC_DEV_DISCONNECTED)
-               return -ENODEV;
-
        ret = usb_autopm_get_interface(stream->dev->intf);
        if (ret < 0)
                return ret;

diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index ead00a8..816dd1a 100644 (file)
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -517,10 +517,6 @@ struct uvc_streaming {
        } clock;
 };
 
-enum uvc_device_state {
-       UVC_DEV_DISCONNECTED = 1,
-};
-
 struct uvc_device {
        struct usb_device *udev;
        struct usb_interface *intf;
@@ -529,7 +525,6 @@ struct uvc_device {
        int intfnum;
        char name[32];
 
-       enum uvc_device_state state;
        struct mutex lock;              /* Protects users */
        unsigned int users;
        atomic_t nmappings;