From eb238732a52b100bdf4a766a50e11e6fd9bd1d83 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 7 May 2012 06:25:30 -0300
Subject: [PATCH] [media] gspca: Call sd_stop0 on disconnect
This is necessary to ensure that worker-threads accessing the device
are stopped before our disconnect handler returns.
This causes a problem with stream_off calling sd_stop0 a second time
when the device handle is closed. This is fixed by setting
gscpa_dev->streaming to 0 on disconnect.
Note that now stream_off will never be called on a disconnected device,
and the present check can thus be removed from stream_off.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
drivers/media/video/gspca/gspca.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 8b97f777ddf4..b7cb9977f778 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -595,16 +595,12 @@ static int gspca_set_alt0(struct gspca_dev *gspca_dev)
static void gspca_stream_off(struct gspca_dev *gspca_dev)
{
gspca_dev->streaming = 0;
- if (gspca_dev->present) {
- if (gspca_dev->sd_desc->stopN)
- gspca_dev->sd_desc->stopN(gspca_dev);
- destroy_urbs(gspca_dev);
- gspca_input_destroy_urb(gspca_dev);
- gspca_set_alt0(gspca_dev);
- gspca_input_create_urb(gspca_dev);
- }
-
- /* always call stop0 to free the subdriver's resources */
+ if (gspca_dev->sd_desc->stopN)
+ gspca_dev->sd_desc->stopN(gspca_dev);
+ destroy_urbs(gspca_dev);
+ gspca_input_destroy_urb(gspca_dev);
+ gspca_set_alt0(gspca_dev);
+ gspca_input_create_urb(gspca_dev);
if (gspca_dev->sd_desc->stop0)
gspca_dev->sd_desc->stop0(gspca_dev);
PDEBUG(D_STREAM, "stream off OK");
@@ -2369,7 +2365,6 @@ void gspca_disconnect(struct usb_interface *intf)
usb_set_intfdata(intf, NULL);
gspca_dev->dev = NULL;
gspca_dev->present = 0;
- wake_up_interruptible(&gspca_dev->wq);
destroy_urbs(gspca_dev);
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
@@ -2380,6 +2375,11 @@ void gspca_disconnect(struct usb_interface *intf)
input_unregister_device(input_dev);
}
#endif
+ /* Free subdriver's streaming resources / stop sd workqueue(s) */
+ if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
+ gspca_dev->sd_desc->stop0(gspca_dev);
+ gspca_dev->streaming = 0;
+ wake_up_interruptible(&gspca_dev->wq);
v4l2_device_disconnect(&gspca_dev->v4l2_dev);
video_unregister_device(&gspca_dev->vdev);
--
2.34.1