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ALSA: x86: Avoid register accesses during disconnection
It seems that accessing registers during disconnection often leads to the GPU pipe error. The original driver had a similar check in the past, but it was lost through refactoring. Now put a connection check in the register access functions. One exception is the irq handler: it still needs to access the raw register even while disconnected, because it has to read and write to ACK the irq mask. Although the irq shouldn't be raised while disconnected (the stream should have been disabled), let's make it safer for now. Signed-off-by: Takashi Iwai <[email protected]>
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