the spca5xx webcam driver module compiles/installs/runs fine (a few
compilation warnings, but nothing much) on vanilla 2.6.x kernels, but
won't succeed on one patched with ingo's realtime pre-emption patches.
*********************************************
[root@localhost spca5xx-20050701]# make
Building SPCA5XX driver for 2.5/2.6 kernel.
Remember: you must have read/write access to your kernel source tree.
make -C /lib/modules/`uname -r`/build
SUBDIRS=/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701
modules
make[1]: Entering directory
`/home/mrmachine/my_documents/applications/linux/system+admin/linux-2.6.12'
CC [M]
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.o
In file included from
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.c:763:
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/mr97311.h:
In function `pcam_start':
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/mr97311.h:391:
warning: ISO C90 forbids mixed declarations and code
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.c:
In function `spca5xx_probe':
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.c:8663:
error: `SPIN_LOCK_UNLOCKED' undeclared (first use in this function)
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.c:8663:
error: (Each undeclared identifier is reported only once
/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.c:8663:
error: for each function it appears in.)
make[2]: ***
[/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701/drivers/usb/spca5xx.o]
Error 1
make[1]: ***
[_module_/home/mrmachine/my_documents/applications/linux/video/spca5xx-20050701]
Error 2
make[1]: Leaving directory
`/home/mrmachine/my_documents/applications/linux/system+admin/linux-2.6.12'
make: *** [default] Error 2
**********************************************************************
all the warnings up to the error occur on a vanilla kernel compilation,
but installs anyway ... i know "SPIN_LOCK_UNLOCKED" has something to do
with ingo's patch, so i emailed the spca5xx author to see if he knew
what to do:
Shayne,
Try to change 'SPIN_LOCK_UNLOCKED' by some thing to initialize the spin :)
regards
i'm guessing it's these lines in spca5xx.c that i have to change:
*****************************************
if (!spca50x_configure (spca50x))
{
spca50x->user = 0;
init_MUTEX (&spca50x->lock); /* to 1 == available */
init_MUTEX (&spca50x->buf_lock);
spca50x->v4l_lock = SPIN_LOCK_UNLOCKED;
spca50x->buf_state = BUF_NOT_ALLOCATED;
}
else
{
err ("Failed to configure camera");
goto error;
}
****************************************
i've looked through the archives for some clue as to what to change it
to, but being a bit on the newbie side, haven't had any luck ...
please CC me on any replies!
thanx
shayne
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