ASoC: SOF: fix panic caused by sdev->msg being null

sound/soc/sof/hw-spi.c

@@ -181,6 +181,16 @@ static int spi_get_reply(struct snd_sof_dev *sdev, struct snd_sof_ipc_msg *msg)
 	int ret = 0;
 	u32 size;
 
+	/*
+	 * Sometimes, there is unexpected reply ipc arriving. The reply
+	 * ipc belongs to none of the ipcs sent from driver.
+	 * In this case, the driver must ignore the ipc.
+	 */
+	if (!msg) {
+		dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
+		return 0;
+	}
+
 	/* get reply */
 	spi_mailbox_read(sdev, sdev->host_box.offset, &reply, sizeof(reply));
 	if (reply.error < 0) {

sound/soc/sof/intel/bdw.c

@@ -488,6 +488,16 @@ static void bdw_get_reply(struct snd_sof_dev *sdev)
 	unsigned long flags;
 	int ret = 0;
 
+	/*
+	 * Sometimes, there is unexpected reply ipc arriving. The reply
+	 * ipc belongs to none of the ipcs sent from driver.
+	 * In this case, the driver must ignore the ipc.
+	 */
+	if (!msg) {
+		dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
+		return;
+	}
+
 	/* get reply */
 	sof_mailbox_read(sdev, sdev->host_box.offset, &reply, sizeof(reply));
 

sound/soc/sof/intel/byt.c

@@ -386,6 +386,16 @@ static void byt_get_reply(struct snd_sof_dev *sdev)
 	unsigned long flags;
 	int ret = 0;
 
+	/*
+	 * Sometimes, there is unexpected reply ipc arriving. The reply
+	 * ipc belongs to none of the ipcs sent from driver.
+	 * In this case, the driver must ignore the ipc.
+	 */
+	if (!msg) {
+		dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
+		return;
+	}
+
 	/* get reply */
 	sof_mailbox_read(sdev, sdev->host_box.offset, &reply, sizeof(reply));
 

sound/soc/sof/intel/hda-ipc.c

@@ -75,6 +75,15 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
 	unsigned long flags;
 	int ret = 0;
 
+	/*
+	 * Sometimes, there is unexpected reply ipc arriving. The reply
+	 * ipc belongs to none of the ipcs sent from driver.
+	 * In this case, the driver must ignore the ipc.
+	 */
+	if (!msg) {
+		dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
+		return;
+	}
 	spin_lock_irqsave(&sdev->ipc_lock, flags);
 
 	hdr = msg->msg_data;

sound/soc/sof/intel/hsw.c

@@ -489,6 +489,16 @@ static void hsw_get_reply(struct snd_sof_dev *sdev)
 	unsigned long flags;
 	int ret = 0;
 
+	/*
+	 * Sometimes, there is unexpected reply ipc arriving. The reply
+	 * ipc belongs to none of the ipcs sent from driver.
+	 * In this case, the driver must ignore the ipc.
+	 */
+	if (!msg) {
+		dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
+		return;
+	}
+
 	spin_lock_irqsave(&sdev->ipc_lock, flags);
 
 	/* get reply */