spca5xx webcam driver not compiling on 2.6.13-rc4-RT-V0.7.52-07

From: Shayne O'Connor
Date: Sun Jul 31 2005 - 19:51:55 EST

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:

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;
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!


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