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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/sound/drivers/mts64.c
.. .. @@ -816,6 +816,9 @@
816 816  	u8 status, data;
817 817  	struct snd_rawmidi_substream *substream;
818 818  
819 +	if (!mts)
820 +		return;
821 +
819 822  	spin_lock(&mts->lock);
820 823  	ret = mts64_read(mts->pardev->port);
821 824  	data = ret & 0x00ff;

..	..	@@ -816,6 +816,9 @@
816	816	u8 status, data;
817	817	struct snd_rawmidi_substream *substream;
818	818
	819	+ if (!mts)
	820	+ return;
	821	+
819	822	spin_lock(&mts->lock);
820	823	ret = mts64_read(mts->pardev->port);
821	824	data = ret & 0x00ff;