Hello,
I debugged a bug[1] I was having with Motion and noticed that the UVC
driver doesn't return an error when doing an ioctl() on a disconnected
device. Wouldn't ENODEV be a sensible value to return in such
situations?
Anyway, this small patch adds a check in the beginning of
uvc_v4l2_do_ioctl(). With the patch Motion works with me as it seems to
work with the pwc driver.
1:
http://www.lavrsen.dk/twiki/bin/view/Motion/BugReport2008x05x17x175521
Index: uvc_v4l2.c
===================================================================
--- uvc_v4l2.c (revision 211)
+++ uvc_v4l2.c (working copy)
@@ -479,6 +479,10 @@
if (uvc_trace_param & UVC_TRACE_IOCTL)
v4l_printk_ioctl(cmd);
+ if (video->dev->state & UVC_DEV_DISCONNECTED) {
+ return -ENODEV;
+ }
+
switch (cmd) {
/* Query capabilities */
case VIDIOC_QUERYCAP:
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