On Sat, Oct 17, 2009 at 05:56:48PM +0100, Jonathan Cameron wrote:
> +static int tsl2550_get_id(void)
> +{
> + int ret, val;
> +
> +idr_again:
> + if (unlikely(idr_pre_get(&tsl2550_idr, GFP_KERNEL) == 0))
> + return -ENOMEM;
> + spin_lock(&tsl2550_idr_lock);
> + ret = idr_get_new(&tsl2550_idr, NULL, &val);
> + if (unlikely(ret == -EAGAIN))
> + goto idr_again;
That looks like a fair chance to produce a deadlock
by reacquiring the above spinlock.
Also I never see the above lock released later from this
function or its caller.
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