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    ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
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    ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
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    chardev->counter--;
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    chardev->counter--;
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    spinlock_unlock(&chardev->lock);
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    spinlock_unlock(&chardev->lock);
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    interrupts_restore(ipl);
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    interrupts_restore(ipl);
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    chardev->ready_func();
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    chardev->op->resume();
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    return ch;
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    return ch;
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}
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}