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[media] uvcvideo: Remove unneeded device disconnected flag

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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>
This commit is contained in:
Laurent Pinchart 2015-05-24 19:45:38 -03:00 committed by Mauro Carvalho Chehab
parent 37f85b276a
commit d511eb7d64
3 changed files with 0 additions and 10 deletions
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2
drivers/media/usb/uvc/uvc_driver.c
View File

@ -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);
}

3
drivers/media/usb/uvc/uvc_v4l2.c
View File

@ -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;

5
drivers/media/usb/uvc/uvcvideo.h
View File

@ -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;