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        spinlock_unlock(&tasks_lock);
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        spinlock_unlock(&tasks_lock);
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        interrupts_restore(ipl);
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        interrupts_restore(ipl);
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        return ENOENT;
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        return ENOENT;
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    }
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    }
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    /*
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     * TODO: We are currently lacking support for task destroying.
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     * Once it is added to the kernel, we must take care to
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     * synchronize in a way that prevents race conditions here.
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     */
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    /* Lock the task and release the lock protecting tasks_btree. */
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    /* Lock the task and release the lock protecting tasks_btree. */
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    spinlock_lock(&t->lock);
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    spinlock_lock(&t->lock);
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    spinlock_unlock(&tasks_lock);
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    spinlock_unlock(&tasks_lock);
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    rc = ddi_iospace_enable_arch(t, ioaddr, size);
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    rc = ddi_iospace_enable_arch(t, ioaddr, size);