On 15-Nov-2002 Oliver Neukum wrote:
>
>> Yes, I think you are right.
>> To test your idea, I moved the initialization
>>
>> init_MUTEX(&usb_bus_list_lock);
>>
>> from usb_init() to just before the call to usb_scan_devices()
>> in usb_register() and the oops went away and cpia worked.
>>
>>
>> I see that in the working code prior to 2.4.13, usb_init() doesnt handle
>> any usb_bus_list_lock initialization. Hmmm.
<snip>
>
> No, don't do complicated halfmeasures.
> Add a call to usb_init to main.c::do_basic_setup if you compile usb into the
> kernel.
To test this strategy, I've done this, and put an
"extern int __init usb_init(void);" (is the "static int _init usb_init(void);"
in drivers/usb/usb.c a conflict with this?)
declaration in include/linux/usb.h, included usb.h in init/main.c, etc, so it
compiles OK,
but the link step fails:
ld -m elf_i386 -T /usr/src/linux-2.4.20-rc1/arch/i386/vmlinux.lds -e stext
arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/main.o init/version.o
init/do_mounts.o \
--start-group \
arch/i386/kernel/kernel.o arch/i386/mm/mm.o kernel/kernel.o mm/mm.o
fs/fs.o ipc/ipc.o \
drivers/parport/driver.o drivers/char/char.o drivers/block/block.o
drivers/misc/misc.o drivers/net/net.o drivers/media/media.o
drivers/char/agp/agp.o drivers/char/drm/drm.o drivers/ide/idedriver.o
drivers/cdrom/driver.o drivers/sound/sounddrivers.o drivers/pci/driver.o
drivers/video/video.o drivers/usb/usbdrv.o \
net/network.o \
/usr/src/linux-2.4.20-rc1/arch/i386/lib/lib.a
/usr/src/linux-2.4.20-rc1/lib/lib.a
/usr/src/linux-2.4.20-rc1/arch/i386/lib/lib.a \
--end-group \
-o vmlinux
init/main.o: In function `do_basic_setup':
init/main.o(.text.init+0x80f): undefined reference to `usb_init'
make: *** [vmlinux] Error 1
------------------------------------------
but look in usbdrv.o, usb_init is there!!
$ grep usb_init drivers/usb/*.o
Binary file usbcore.o matches
Binary file usbdrv.o matches
Binary file usb.o matches
---------drivers/usb/usb.c (unchanged)-------------
static int __init usb_init(void)
{
init_MUTEX(&usb_bus_list_lock);
usb_major_init();
usbdevfs_init();
usb_hub_init();
return 0;
}
---include/linux/usb.h------------------------
<snip>
#endif /* CONFIG_USB_DEVICEFS */
extern int __init usb_init(void);
#endif /* __KERNEL__ */
#endif
----init/main.c----------------------------------
<snip>
#ifdef CONFIG_USB
#include <linux/usb.h>
#endif
<snip>
ifdef CONFIG_TC
tc_init();
#endif
#ifdef CONFIG_USB
usb_init();
#endif
<snip>
------------------------------
init/main.c already initializes , e.g., the zorro driver, and I can't see
anything that is done for zorro that I didnt now do for usb_init. What have I
overlooked?
Duncan
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