tree 6cccfbd1a7863ea830448b981019a7357997daf8
parent 44597f65f6af3c692560a639f61d25398d13d1b6
author Zhang, Yanmin <yanmin_zhang@linux.intel.com> 1163668748 -0800
committer Linus Torvalds <torvalds@woody.osdl.org> 1163706217 -0800

[PATCH] ipmi: use platform_device_add() instead of platform_device_register() to register device allocated dynamically

I got below warning when running 2.6.19-rc5-mm1 on my ia64 machine.

WARNING at lib/kobject.c:172 kobject_init()

Call Trace:
 [<a0000001000137c0>] show_stack+0x40/0xa0
                                sp=e0000002ff9f7bc0 bsp=e0000002ff9f0d10
 [<a000000100013850>] dump_stack+0x30/0x60
                                sp=e0000002ff9f7d90 bsp=e0000002ff9f0cf8
 [<a000000100407bb0>] kobject_init+0x90/0x160
                                sp=e0000002ff9f7d90 bsp=e0000002ff9f0cd0
 [<a0000001005ae080>] device_initialize+0x40/0x1c0
                                sp=e0000002ff9f7da0 bsp=e0000002ff9f0cb0
 [<a0000001005b88c0>] platform_device_register+0x20/0x60
                                sp=e0000002ff9f7dd0 bsp=e0000002ff9f0c90
 [<a000000100592560>] try_smi_init+0xbc0/0x11e0
                                sp=e0000002ff9f7dd0 bsp=e0000002ff9f0c50
 [<a000000100594900>] init_ipmi_si+0xaa0/0x12e0
                                sp=e0000002ff9f7de0 bsp=e0000002ff9f0bd8
 [<a000000100009910>] init+0x350/0x780
                                sp=e0000002ff9f7e00 bsp=e0000002ff9f0ba8
 [<a000000100011d30>] kernel_thread_helper+0x30/0x60
                                sp=e0000002ff9f7e30 bsp=e0000002ff9f0b80
 [<a0000001000090c0>] start_kernel_thread+0x20/0x40
                                sp=e0000002ff9f7e30 bsp=e0000002ff9f0b80
WARNING at lib/kobject.c:172 kobject_init()

Call Trace:
 [<a0000001000137c0>] show_stack+0x40/0xa0
                                sp=e0000002ff9f7b40 bsp=e0000002ff9f0db0
 [<a000000100013850>] dump_stack+0x30/0x60
                                sp=e0000002ff9f7d10 bsp=e0000002ff9f0d98
 [<a000000100407bb0>] kobject_init+0x90/0x160
                                sp=e0000002ff9f7d10 bsp=e0000002ff9f0d70
 [<a0000001005ae080>] device_initialize+0x40/0x1c0
                                sp=e0000002ff9f7d20 bsp=e0000002ff9f0d50
 [<a0000001005b88c0>] platform_device_register+0x20/0x60
                                sp=e0000002ff9f7d50 bsp=e0000002ff9f0d30
 [<a00000010058ac00>] ipmi_register_smi+0xcc0/0x18e0
                                sp=e0000002ff9f7d50 bsp=e0000002ff9f0c90
 [<a000000100592600>] try_smi_init+0xc60/0x11e0
                                sp=e0000002ff9f7dd0 bsp=e0000002ff9f0c50
 [<a000000100594900>] init_ipmi_si+0xaa0/0x12e0
                                sp=e0000002ff9f7de0 bsp=e0000002ff9f0bd8
 [<a000000100009910>] init+0x350/0x780
                                sp=e0000002ff9f7e00 bsp=e0000002ff9f0ba8
 [<a000000100011d30>] kernel_thread_helper+0x30/0x60
                                sp=e0000002ff9f7e30 bsp=e0000002ff9f0b80
 [<a0000001000090c0>] start_kernel_thread+0x20/0x40
                                sp=e0000002ff9f7e30 bsp=e0000002ff9f0b80

The root cause is the device struct is initialized twice.

If the device is allocated dynamically by platform_device_alloc,
platform_device_alloc will initialize struct device, then,
platform_device_add should be used to register the device.

The difference between platform_device_register and platform_device_add is
platform_device_register will initiate the device while platform_device_add
won't.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Cc: Corey Minyard <minyard@acm.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>