On Sunday 06 May 2007, Geoff Levand wrote:
> --- ps3-linux-dev.orig/arch/powerpc/platforms/cell/spu_base.c
> +++ ps3-linux-dev/arch/powerpc/platforms/cell/spu_base.c
> @@ -463,8 +463,21 @@ void spu_free(struct spu *spu)
> }
> EXPORT_SYMBOL_GPL(spu_free);
>
> +static int spu_shutdown(struct sys_device *sysdev)
> +{
> + struct spu *spu = container_of(sysdev, struct spu, sysdev);
> +
> + // what else here???
> +
> + spu_free_irqs(spu);
> + spu_destroy_spu(spu);
> + kfree(spu);
> + return 0;
> +}
> +
> struct sysdev_class spu_sysdev_class = {
> - set_kset_name("spu")
> + set_kset_name("spu"),
> + .shutdown = spu_shutdown,
> };
>
> int spu_add_sysdev_attr(struct sysdev_attribute *attr)
After some debugging, I found that this patch creates an oops when slab
debugging is enabled, the reason for that being that sysdev_shutdown()
iterates over all system devices using list_for_each_entry(), not
list_for_each_entry_safe().
There are two ways of fixing this:
- use list_for_each_entry_safe() to go over all devices so they
can be freed in their ->shutdown method.
- not free the device, because we know the system is going down
anyway.
Is it documented or implied somewhere that ->shutdown must not free
the device? If not, the first option is probably the safer choice.
Arnd <><
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