From d511eb7d642aaf513fefeb05514dc6177c53c350 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sun, 24 May 2015 19:45:38 -0300 Subject: [PATCH] [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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/uvc/uvc_driver.c | 2 -- drivers/media/usb/uvc/uvc_v4l2.c | 3 --- drivers/media/usb/uvc/uvcvideo.h | 5 ----- 3 files changed, 10 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 5970dd6a1c1c..4b5b3e8fb7d3 100644 --- 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 69d01803e0aa..2764f43607c1 100644 --- 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 ead00a83df04..816dd1a0fd81 100644 --- 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;