AST2600 i2c irq issue

[Wolfram Sang <wsa@the-dreams.de>]

>          spin_lock(&bus->lock);
>          irq_received = readl(bus->base + ASPEED_I2C_INTR_STS_REG);
> +       if (!irq_received)
> +               return IRQ_NONE;
> +
>          /* Ack all interrupts except for Rx done */
>          writel(irq_received & ~ASPEED_I2CD_INTR_RX_DONE,
>                 bus->base + ASPEED_I2C_INTR_STS_REG);
> 
> 
> I think it's a right fix for the issue. At least, we need to prevent
> any driver state corruption. The state machine would run correctly if
> we filtering the garbage interrupt out.

Just unlock the spinlock before you return...

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